IntroOptical Filters. Windows

Transcription

1 IntroOptical Filters Filter Specifications Filter Selection Guide Custom and Image Filters Interference Filters High Rejection Laser Line Filters Notch Filters Edge Filters Long Pass Filters Short Pass Filters Variable Bandpass Filters Glass Substitute Filters Color Process Filters Schott Color Glass Neutral Density Filters Variable Neutral Density Storage Cases Circular Filter Mount Heat Control Filters Hot Mirrors Cold Mirrors Dielectric Attenuators Spectrophotometer Calibration Filters CCD System Equalizer Filters Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix

2 Mirrors Lenses Prisms Windows Intro Beamsplitters Optical Filters Specifications Following is a short review of filter specifications to assist you in formulating requirements for your particular application. CVI maintains a qualified staff of applications engineers to assist you in selecting the best product available at the minimum cost. Center Wavelength Center Wavelength (CWL) is the arithmetic mean of the pass band expressed in nanometers. For instance, a HeNe laser filter would have a center wavelength of 632.8nm. Center wavelength tolerance: dependent variable determined by your requirements for center wavelength, full width at half maximum, transmittance, and blocking. A CVI applications engineer will be happy to help you with any questions. Out-of-Band Rejection Out-of-Band Rejection (Blocking) is the amount of energy, outside the filter pass band, transmitted through the filter. It is often expressed as an absolute level, such as 10-4, meaning there are no transmission peaks outside the pass band exceeding T or 0.01% T. Values are specified in units of Optical Density (O.D.). 1 Optical Density (O.D.) = Log T 10 where T= transmission. The rejection range in nanometers must accompany this specification. Filter Dimensions Filter dimensions are specified in inches or millimeters, along with tolerances. Standard sizes are 0.50" Ø, 1.00" Ø, and 2.00" Ø. Standard interference filters are mounted in a black anodized aluminum ring to provide a higher quality filter. The Polarizers Waveplates Filters Etalons Ultrafast Interferometer Appendix Mounts ± 20% of FWHM Percent Transmission Percent Transmission is the amount of power received by the detector compared to the total power available. The traditional formula is %T = I/I o x (100), where I o is the incident power and I is the transmitted power. Bandpass Bandpass is the width of the pass band, measured in nanometers, at the halfpower points of the pass band. It is often expressed as Full Width at Half Maximum (FWHM). Tolerance: ± 20% of FWHM Bandpass Shape Bandpass shapes can vary from triangular to nearly square. The number of cavities in a filter describes the overall spectral shape. The more cavities the filter has, the more square the band shape. Typical shapes for a one cavity, two cavity, three cavity, and five cavity filters are shown in Figure 1. Typical Band Pass Shape of a One Cavity filter. Figure 2. Typical Band Pass Shape of a Two Cavity filter. Figures 1, 2, 3, and 4. Please note that for custom filters, the number of cavities is a Figure 3. Typical Band Pass Shape of a Three Cavity filter. Figure 4. Typical Band Pass Shape of a Five Cavity filter. 286 Americas (505) Europe +44 (0) Asia +82 (0) Order now at

3 Optical Filters Intro Specifications thickness for these standard ring mounted filters is 0.25 inches. Custom sizes and thicknesses are available, please contact a CVI sales engineer for more information. Variation of Wavelength with Incident Angle CVI s standard interference filters are designed for use at normal incidence in collimated light. Certain characteristics of thin film interference filters change with incidence angle. Center wavelength, the most important parameter of a filter, varies approximately as a cosine function, shifting towards shorter wavelengths with increasing angle. The following equation may be used to determine the wavelength at a certain angle of incidence: λ = λ o 1 ( where n o n eff λ = Wavelength at Angle of Incidence λ o = Wavelength at Normal Incidence φ = Angle of Incidence ) 2 sin 2 φ n o = Refractive of External Medium n eff =Effective Refractive of Filter Number of Cavities by CWL CWL HBW Number Range (FWHM) of (nm) (nm) Cavities na > na Environmental Considerations Filters are sensitive to changes in environment, with temperature and humidity being the most critical factors. CVI interference filters are designed for operation at 23 degrees Celsius. These filters can be used throughout the temperature range of -50 to +100 degrees Celsius as long as thermal shock is avoided. (Thermal shock can be avoided if the change in filter temperature is less than five degrees Celsius per minute.) Temperature change causes the center wavelength to shift approximately 0.02nm per degree Celsius. See Figure 5. λ Figure 5. Temperature Coefficient vs. Center Wavelength. Long-term exposure to extreme humidity may cause filter deterioration. A CVI applications engineer can provide additional information on this subject. Environmental Specifications Humidity: MIL-STD-810F, Method 507, Procedure 1 Abrasion: MIL-C-48497, Para eraser rub Adhesion: MIL-C-48497, Para tape test Cleanability: MIL-C-48497, Para solvents Surface Quality: scratch-dig Custom filters can be manufactured to withstand more than 20 cycles of MIL-STD-810C. Cosmetics CVI strives to give all of its products a pleasing appearance. However, total elimination of pinholes, inclusions, microscopic scratches, and other imperfections would dramatically increase filter costs. Careful attention is given to ensuring that these minor defects do not affect filter performance. Packaging CVI filter products are packaged to promote optimum shelf life. Unless the customer makes special arrangements, filter products will be delivered in our standard packaging. Filters are packaged in a protective envelope which is impervious to moisture. This envelope is then purged with nitrogen and heat sealed which minimizes environmental damage. Cleaning Method Optical filters are fragile and must be handled with care. CVI s filter products are cleaned and inspected for quality assurance before they are shipped to the customer. These products should be handled by the edges to avoid any damage to the optical surfaces. When cleaning becomes necessary, please follow the recommended cleaning method below: Fold a lens tissue to a size just larger that the optic being cleaned. Spray the folded edge of the tissue with isopropyl alcohol. Gently wipe the surface of the filter with a straight sweeping motion. Do not reuse a contaminated tissue as damage to the optical surface may occur. Repeat the process if necessary. Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at 287

4 Mirrors Lenses Prisms Windows Intro Filters Selection Guide Transmission Filters Product Type FWHM Peak % T Blocking Applications High Rejection Filter HRF l 302 Interference Filters F l nm 90% > 6 OD Fluorescence Raman Laser line clean-up 3nm, 10nm, 25nm, 40nm, 70nm 12-60% 3-5 OD Laser line clean-up Beamsplitters Polarizers Waveplates Variable Bandpass Sets VPFS l 308 Sets of LPF and SPF filters to mix and match for user selectable bandpass 80% 3 OD Fluorescence Raman Laserline blocking Filters Etalons Ultrafast Interferometer Blocking Filters Product Type FWHM Peak % T Blocking Applications Notch Filters RNF l 304 Color Process CP l nm 100nm 90% 75% > 6 OD Fluorescence Raman Laserline blocking 2 OD Fluorescence Appendix Mounts Color Glass CG l nm > 80% up to 5 OD Attenuation Isolation of Broadband Source continued 288 Americas (505) Europe +44 (0) Asia +82 (0) Order now at

5 Filters Selection Guide Intro Edge Filters Product Type Peak % T Blocking Applications Windows Edge Filters REF l % > 6 OD Fluorescence Raman Prisms Lenses Long Wave Pass Filters LPF l 306 Short Wave Pass Filters SPF l 307 Color Glass CG l % 50-80% > 80% 3 OD Fluorescence Raman 3 OD Fluorescence Raman up to 5 OD Attenuation Isolation of Broadband Source Mirrors Beamsplitters Waveplates Polarizers Ultrafast Glass Substitute LP l % 4 OD Fluorescence Raman Etalons Heat Control Filters HR, HER, HT, UR l % 90% Reflectance out-of-band Reflects IR wavelength to keep filter cool Filters Interferometer Mounts Appendix continued Americas (505) Europe +44 (0) Asia +82 (0) Order now at 289

6 Mirrors Lenses Prisms Windows Intro Filters Broadband Attenuation, High Energy Attenuation, Equalizing Filters, Calibration Filters Selection Guide Product Type Peak % T Blocking Applications High Energy Attenuators HPDA, UVDA l 326, 327 Absorptive Neutral Density Filter Sets ANGS l % % OD Attenuation of high energy laser lines Non-absorbing OD Broadband attenuation Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Inconel Neutral Density Filters ND, NDQ l 320, 321 Variable Neutral Density Filters LND, LNDQ, LSND, CNDQ, CND, CSND l Calibration Filters CF l % Range Range OD Broadband attenuation Range Range Broadband attenuation Broadband attenuation Interferometer Heat Control Filters HR, HER, HT, UR l % 90% Reflectance out-of-band Reflects IR wavelength to keep filter cool Appendix Mounts CCD Equalizer Filters EQ l 331 CCD 290 Americas (505) Europe +44 (0) Asia +82 (0) Order now at

7 Custom and Image Quality Filters Capabilities Intro Custom Filters When it comes to optical filters, no job is too big or too small for CVI s Optical Filter group. We offer a wide range of center wavelengths and bandwidths. Optical filters can be designed with custom blocking if required. If your application calls for special shapes, sizes, or a special mount, CVI s Optical Filter group is waiting to help. We have a complete manufacturing facility that allows us to create a wide range of options. Put our 30 years of experience to the test. Please contact our helpful applications engineers for assistance. Image Quality When your application requires an improved image, CVI can accommodate your needs. We begin the process with our high quality, optically flat substrates. These are then coated and assembled using highly specialized techniques that produce a filter of higher optical quality. Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at 291

8 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast UV Interference Filters Custom options are available for center wavelength, bandwidth, optical blocking, and size Contact a CVI applications engineer for more information Double Filter Wheels with twelve positions are available l 399 Filter Stack Holders are available l 403 F Diameter Tolerance ", 0.01" Thickness CWL mm nominal CWL mm nominal Surface Figure Commercial polish Surface Quality per MIL-PRF-13830B CWL Tolerance ± 20% of FWHM Bandwidth Tolerance ± 20% of FWHM Clear Aperture Filter size Clear Aperture 0.50" 0.35" (9.0mm) 1.00" 0.79" (20.0mm) 2.00" 1.79" (45.4mm) Mounting Black anodized aluminum ring Blocking Range X-ray to 1200nm How To Order F Product Code FWHM nm Center Wavelength nm Optical Density Size Code Appendix Mounts Interferometer With the CVI Filter Wheel 8202 you can accomodate up to 12 2 Ø filters l F-UV Americas (505) Europe +44 (0) Asia +82 (0) Order now at

9 F UV Interference Filters Intro UV Interference Filters Laser Min. Peak Filter Size or CWL FWHM Trans. Blocking Element (nm) (nm) % O.D Diameter 1.00 Diameter 2.00 Diameter F F F F F F F F F F F F Co F F F Hg F F F F F F Hg F F F Hg F F F Hg F F F Hg F F F Hg F F F Hg F F F F F F F F F Zn F F F Zn F F F F F F Hg F F F F F F Cd F F F Ta, Ag F F F Hg F F F N laser F F F F F F Ru F F F Nd:YAG F F F F F F Hg F F F Y, Yb F F F Mo F F F F F F Sc F F F Al F F F Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at F-UV 293

10 Beamsplitters Mirrors Lenses Prisms Windows Intro Visible Interference Filters Custom options are available for center wavelength, bandwidth, optical blocking, and size Contact a CVI applications engineer for more information Double Filter Wheels with twelve positions are available l 399 Filter Stack Holders are available l 403 F Diameter Tolerance ", 0.01" Thickness 0.25 nominal Surface Figure Commercial polish Surface Quality per MIL-PRF-13830B CWL Tolerance ± 20% of FWHM Bandwidth Tolerance ± 20% of FWHM Clear Aperture Filter size Clear Aperture 0.50" 0.35" (9.0mm) 1.00" 0.79" (20.0mm) 2.00" 1.79" (45.4mm) Mounting Black anodized aluminum ring Blocking Range X-ray to 1200nm* Polarizers Waveplates Filters Etalons Ultrafast Interferometer Appendix Mounts Visible Interference Filters Laser Min. Peak Filter Size or CWL FWHM Trans. Blocking Element (nm) (nm) % O.D Diameter 1.00 Diameter 2.00 Diameter F F F F F F F F F Dy, Yb F F F F F F F F F Mn F F F Hg F F F F F F F F F Pb F F F Nb F F F Ni F F F Ni F F F Ce F F F F F F Ga F F F Eu F F F Eu F F F Ca F F F Cr F F F C F F F Sm, W F F F Sm, W F F F W F F F Hg F F F Hg F F F continued 294 F-VIS Americas (505) Europe +44 (0) Asia +82 (0) Order now at

11 F Visible Interference Filters Intro Visible Interference Filters Laser Min. Peak Filter Size or CWL FWHM Trans. Blocking Element (nm) (nm) % O.D Diameter 1.00 Diameter 2.00 Diameter V F F F Fe F F F F F F Ni F F F HeCd F F F F F F F F F F F F F F F F F F F F F F F F In F F F Sn F F F Ba F F F Ar F F F Cs, Ar F F F F F F Sr F F F F F F F F F Zr F F F F F F Co F F F F F F F F F Ar F F F F F F F F F F F F F F F Ti F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F Cu-vapor F F F F F F Ar F F F Ar F F F continued Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at F-VIS 295

12 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Interferometer Appendix Mounts Visible Interference Filters Visible Interference Filters Laser Min. Peak Filter Size or CWL FWHM Trans. Blocking Element (nm) (nm) % O.D Diameter 1.00 Diameter 2.00 Diameter Mg F F F F F F F F F F F F F F F F F F F F F Nd:YAG F F F F F F Tl F F F F F F F F F F F F F F F Ag F F F F F F F F F F F F F F F F F F F F F F F F Dye F F F F F F F F F F F F F F F F F F F F F Na F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F continued 296 F-VIS Americas (505) Europe +44 (0) Asia +82 (0) Order now at

13 F Visible Interference Filters Intro Visible Interference Filters Laser Min. Peak Filter Size or CWL FWHM Trans. Blocking Element (nm) (nm) % O.D Diameter 1.00 Diameter 2.00 Diameter Au F F F F F F HeNe F F F HeNe F F F F F F Zn F F F F F F Cd F F F ArKr F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F GaAlAs F F F * F F F Li F F F F F F F F F Kr F F F Kr F F F F F F F F F F F F Ruby F F F F F F F F F F F F F F F F F F F F F F F F GaAlAs F F F F F F F F F F F F F F F Alexandrite F F F *Blocking Range is from x-ray to 1.1µm Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at F-VIS 297

14 Mirrors Lenses Prisms Windows Intro Near IR Interference Filters Custom options are available for center wavelength, bandwidth, optical blocking, and size Contact a CVI applications engineer for more information Double Filter Wheels with twelve positions are available l 399 Filter Stack Holders are available l 403 F Diameter Tolerance ", 0.01" Thickness 0.25 nominal Surface Figure Commercial polish Surface Quality per MIL-PRF-13830B CWL Tolerance ± 20% of FWHM Bandwidth Tolerance ± 20% of FWHM Clear Aperture Filter size Clear Aperture 0.50" 0.35" (9.0mm) 1.00" 0.79" (20.0mm) 2.00" 1.79" (45.4mm) Mounting Black anodized aluminum ring Blocking Range Varies by filter - please see specifications below Beamsplitters Polarizers Waveplates How To Order F Product Code FWHM nm Center Wavelength nm Optical Density Size Code Filters Etalons Ultrafast Interferometer Appendix Mounts Near IR Interference Filters Laser Min. Peak Filter Size or CWL FWHM Trans. Blocking Blocking Element (nm) (nm) % O.D. Range 0.50 Diameter 1.00 Diameter 2.00 Diameter nm F F F nm F F F nm F F F nm F F F K nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F GaAlAs nm F F F Rb nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F continued 298 F-NIR Americas (505) Europe +44 (0) Asia +82 (0) Order now at

15 F Near IR Interference Filters Intro Near IR Interference Filters Laser Min. Peak Filter Size or CWL FWHM Trans. Blocking Blocking Element (nm) (nm) % O.D. Range 0.50 Diameter 1.00 Diameter 2.00 Diameter nm F F F nm F F F nm F F F GaAlAs nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F GaAs nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F GaAs nm F F F nm F F F nm F F F nm F F F nm F F F GaAs nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F nm F F F Nd:YLF nm F F F nm F F F nm F F F nm F F F Nd:YAG nm F F F continued Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at F-NIR 299

16 Polarizers Waveplates Beamsplitters Mirrors Lenses Prisms Windows Intro Near IR Interference Filters Near IR Interference Filters Laser Min. Peak Filter Size or CWL FWHM Trans. Blocking Blocking Element (nm) (nm) % O.D. Range 0.50 Diameter 1.00 Diameter 2.00 Diameter Nd:YAG nm F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F Nd:YAG UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F UV - FAR IR F F F F Filters Etalons Ultrafast Interferometer Appendix Mounts IR and FIR interference filters Available at custom wavelengths Available in custom sizes Pictured above is transmittance vs. wavelength of a Long Pass Edge Filter. Similar performance for Short Pass Edge Filter is also acheivable. Wide bandpass filters for the IR and FIR are also available. Substrate Material ZnSe, Ge, Si, or Sapphire Transmission T avg > 90.0% from 8.0µm to 11.5µm Rejection Zone T < 0.1% CVI has extensive experience in the CVI offers a full line of long and short pass manufacture of build-to-print infrared dielectric filters for the infrared and into and far infrared edge and wide bandpass the far infrared region. The average pass filters. band transmission is typically better than 90% and less than 0.1% in the rejection Dielectric edge filters provide a sharp zone, depending on the substrate, angle of transition in transmission which is used to incidence and the spectral regions. separate two wavelength regions. Wide bandpass dielectric filters with Long wave pass filters are designed to bandwidths above 15% are usually transmit wavelengths longer than 50% of obtained by combining long and short pass the cut-on values, while rejecting the filters. All optical filters can be optimized shorter wavelengths. Short wave pass according to the individual specifications. filters will transmit wavelengths shorter Call CVI for more details. than their 50% cut-off value and reject longer wavelengths. 300 F-NIR Americas (505) Europe +44 (0) Asia +82 (0) Order now at

17 FS Interference Filter Sets Intro UV Interference Filter Sets Part Number FWHM Size FS10-UV nm 1.00" Diameter FS10-UV nm 2.00" Diameter Choose any 7 filters from pages with the same FWHM and size. Windows Prisms Narrow Band Interference Filter Sets are available for UV, visible, and near IR wavelength ranges Filter sets are supplied with a hardwood case and transmission curves of each filter Double Filter Wheels with twelve positions are available l 399 Filter Stack Holders are available l 403 Visible Interference Filter Sets Part Number FWHM Size FS1.5-VIS nm 1.00" Diameter FS1.5-VIS nm 2.00" Diameter FS3.0-VIS nm 1.00" Diameter FS3.0-VIS nm 2.00" Diameter FS10-VIS nm 1.00" Diameter FS10-VIS nm 2.00" Diameter FS25-VIS nm 1.00" Diameter FS25-VIS nm 2.00" Diameter FS40-VIS nm 1.00" Diameter FS40-VIS nm 2.00" Diameter FS70-VIS nm 1.00" Diameter FS70-VIS nm 2.00" Diameter Choose any 7 filters from pages with the same FWHM and size. Near IR Interference Filter Sets Part Number FWHM Size FS10-NIR nm 1.00" Diameter FS10-NIR nm 2.00" Diameter FS25-NIR nm 1.00" Diameter FS25-NIR nm 2.00" Diameter FS40-NIR nm 1.00" Diameter FS40-NIR nm 2.00" Diameter FS70-NIR nm 1.00" Diameter FS70-NIR nm 2.00" Diameter Choose any 7 filters from pages with the same FWHM and size. Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at FS 301

18 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Interferometer Appendix Mounts High Rejection Laser Line Filters Raman Spectroscopy Highest laser line transmission for clean-up Steep edges for maximum out of band rejection Hard dielectric coatings for proven environmental reliability and durability Transmission vs. Wavelength of typical High Rejection Filter for 785.0nm laser line. Use with REF l 305 Sometimes called clean-up filters or laser line filters, these filters feature high transmission of the desired laser line and superior blocking of the unwanted wavelengths. Of particular importance is Substrate Material Outer Diameter Thickness Ring Housing Material Transmission at Laser Line >90% HRF Low fluorescence BK7 or better 12.5mm, ± 0.05mm 3.5mm, ± 0.1mm Aluminum, black-anodized Typical Bandwidth 0.38% of λ L,maximum at 0.70% of λ L Angle of Incidence 0.0 ± 2.0 º Blocking Coating Type Surface Quality Transmitted Wavefront Error Clear Aperture Environmental Durability Physical Durability Damage Threshold the bandwidth of blocking greater than OD 5 and OD 6. The graphs to the right are typical traces of the HRF laser line filter series. These graphs help to explain the table below High Rejection Laser Line Filters Blocking and Bandwidth Specifications see table Hard ion-beam-sputtered per MIL-PRF-13830B <λ/4 RMS at λ = 633nm >80 % of Outer Diameter MIL-STD-810F MIL-C-48497A 0.1J/cm 2, 10ns, 20Hz at 532nm which calls out specifically the minimum blocking on either the blue shift side (wavelengths < laser line) and the red shift side (wavelengths > laser line). For more information, Typical Maximum Blue shift range OD>6 Blue shift range OD>5 Red shift range OD>5 Red shift range OD>6 λ ν Bandwidth Bandwidth % T ν λ ν λ ν λ ν λ > 80% > 85% > 85% > 90% > 90% > 90% > 90% > 90% > 90% > 90% > 90% > 90% > 90% > 90% > 90% > 90% > 90% > 90% > 90% HRF Americas (505) Europe +44 (0) Asia +82 (0) Order now at

19 HRF High Rejection Laser Line Filters Intro Wavenumber equation: ν = 1 λ Windows example: 18797cm -1 1 = nm Prisms How To Order HRF Product Code HRF As demonstrated above, the REF and HRF have been designed to work together as a filter pair for applications such as Raman spectroscopy. The HRF cleans up the excitation laser line; the REF removes the laser line from the sample emissions. Center Wavelength nm Typical trace of blocking characteristics of HRF series filters. For other wavelengths go to Typical trace of blocking characteristics of HRF series filters. For other wavelengths go to Typical trace of blocking characteristics of HRF series filters. For other wavelengths go to Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at HRF 303

20 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Interferometer Appendix Mounts Notch Filters Notch Filters for Raman and Fluorescence applications Deep notches for maximum laser rejection High transmission outside the notch to detect the weakest signals Double Filter Wheels with twelve positions are available l 399 Filter Stack Holders are available l 403 Transmission vs. Wavelength of typical Notch Filter for 632.8nm laser line. Optical Density vs. Wavelength of typical Notch Filter for 632.8nm laser line. Substrate Material Outer Diameter Thickness Ring Housing Material Laser Line Blocking RNF >6 OD Typical 50% Notch Bandwidth NBW = 55 x 10-6 x λ 2 L + 14 x 10-3 x λ L Max 50% Notch Bandwidth that is, 17nm (600cm -1 ) for 532.0nm filter <1.1 x NBW 90% Notch Bandwidth <1.3 x NBW Average Passband Transmission >90% Passband Transmission Ripple <2.5% Passband from 0.75 x λ L to λ L / 0.75 Angle of Incidence 0.0 ± 5.0 º Angle Tuning Range* Coating Type Surface Quality Transmitted Wavefront Error Clear Aperture Environmental Durability Physical Durability Damage Threshold Ultra-low autofluorescence fused silica 25.0mm, / 0.1mm 3.5mm, ± 0.1mm 1.0 % of laser wavelength ( 5.3nm or + 190cm -1 for 532nm filter) Hard ion-beam-sputtered per MIL-PRF-13830B <λ/4 RMS at λ = 633nm >80 % of Outer Diameter MIL-STD-810F MIL-C-48497A 1J/cm 2 at 532nm, 10ns, 20Hz * For small angles θ (in degrees) the wavelength shift near the laser wavelength is λ = 5.0x10 5 x λ L x θ 2 (nm) and the wavenumber shift is (wavenumbers) = 500 x θ 2 / λ L (cm 1 ), where λ L (in nm) is the laser wavelength. These filters are ideal for Raman and fluorescence applications, where maximum blocking of the laser line is required. These filters are designed to withstand aggressive environmental conditions. Ultra-low auto-fluorescence fused silica has a small thermal coefficient of expansion over a large temperature range. Product Code RNF Center Wavelength nm Aluminum, black-anodized How To Order RNF RNF Americas (505) Europe +44 (0) Asia +82 (0) Order now at

21 REF Edge Filters Intro Substrate Material Outer Diameter Thickness Ring Housing Material Edge Steepness (typical) Laser Line Blocking BK7 glass or fused silica 25.0mm, / 0.1mm 3.5mm, ± 0.1mm Aluminum, black-anodized 0.5 % of laser wavelength > 6 OD Windows Prisms Angle Tuning Range* is 0.3 % of laser wavelength ( 1.6nm or + 60cm 1 for a 532nm filter) * For small angles θ (in degrees) the wavelength shift near the laser wavelength is λ = 5.0x10 5 x λ L x θ 2 (nm) and the wavenumber shift is (wavenumbers) = 500 x θ 2 / λ L (cm 1 ), where λ L (in nm) is the laser wavelength. Transmission vs. Wavelength of typical Edge Filter for 532.0nm laser line. Optical Density vs. Wavelength of typical Edge Filter for 532.0nm laser line Steep edges to measure very small Raman shifts Deep blocking for maximum laser rejection High transmission to detect the weakest signals Hard ion-beam-sputtered coatings for proven environmental stability and durability Use with HRF l 302 Average Passband Transmission > 93 % Angle of Incidence 0.0 ± 2.0 º Surface Quality per MIL-PRF-13830B Transmitted Wavefront Error <λ/4 RMS at λ = 633nm Clear Aperture >80 % of Outer Diameter Environmental Durability MIL-STD-810F Physical Durability MIL-C-48497A Damage Threshold 1J/cm 2 at 532nm, 10ns, 20Hz How To Order REF Product Code REF Blocks Wavelength (nm) Passband Long λ Material Fused Silica BK BK Fused Silica Fused Silica BK Fused Silica Fused Silica Fused Silica Fused Silica Fused Silica Fused Silica Fused Silica Fused Silica Fused Silica BK BK A Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Transition Width (from the laser line to 50% Transmission) A B Transition Width<1% of laser wavelength Transition Width<2% of laser wavelength Americas (505) Europe +44 (0) Asia +82 (0) Order now at REF 305

22 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Interferometer Appendix Mounts Long Wave Pass Filters/Sets Transmission vs. Wavelength of Visible Long Wave Pass Filter Sets. Long Wave Pass Filters are available individually or as filter sets for visible, near IR, and IR wavelength ranges Custom options are available for cut-on wavelength and size. Call CVI for information on IR wavelength filters Double Filter Wheels with twelve positions are available l 399 Filter Stack Holders are available l 403 Transmission vs. Wavelength of Near IR Long Wave Pass Filter Sets. Transmission vs. Wavelength of IR Long Wave Pass Filter Sets. LPF, LPFS Sizes Thickness Surface Figure Surface Quality 0.50 Ø, 1.00 Ø, and 2.00 Ø 0.25 nominal Clear Aperture Filter size Mounting Cut-on Wavelength Cut-on Tolerance Blocking Range Transmittance Range Long Wave Pass Filters Long Wave Pass Filter Sets Commercial polish per MIL-PRF-13830B Clear Aperture 0.50" 0.35" (9.0mm) 1.00" 0.79" (20.0mm) 2.00" 1.79" (45.4mm) Black anodized aluminum ring 50% of peak transmittance ±10mm O.D. 3 from x-ray to 85% of cut-on λ From cut-on λ to 2500nm Cut-on λ (nm) 0.50 Diameter 1.00 Diameter 2.00 Diameter 400 LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF LPF Wavelength 0.50 Diameter 1.00 Diameter 2.00 Diameter Visible LPFS-VIS-0.50 LPFS-VIS-1.00 LPFS-VIS-2.00 Near IR LPFS-NIR-0.50 LPFS-NIR-1.00 LPFS-NIR-2.00 IR LPFS-IR-0.50 LPFS-IR-1.00 LPFS-IR-2.00 Visible Long Wave Pass Filter Sets contain 7 filters, one each of the following cut-on wavelengths: 400nm, 450nm, 500nm, 550nm, 600nm, 650nm, and 700nm. Near IR Long Wave Pass Filter Sets contain 6 filters, one each of the following cut-on wavelengths: 750nm, 800nm, 850nm, 900nm, 950nm, and 1000nm. IR Long Wave Pass Filter Sets contain 5 filters, one each of the following cut-on wavelengths: 1100nm, 1200nm, 1300nm, 1400nm, and 1500nm. Filter sets are supplied with a hardwood case and transmission curves of each filter. 306 LPF Americas (505) Europe +44 (0) Asia +82 (0) Order now at

23 SPF, SPFS Short Wave Pass Filters/Sets Intro Transmission vs. Wavelength of Visible Short Wave Pass Filter Sets. Short Wave Pass Filters are available individually or as filter sets for visible and near IR wavelength ranges Custom options are available for cut-off wavelength and size. Call CVI for information on IR wavelength filters Double Filter Wheels with twelve positions are available l 399 Filter Stack Holders are available l 403 Transmission vs. Wavelength of Near IR Short Wave Pass Filter Sets. Sizes Thickness Surface Figure Surface Quality 0.50 Ø, 1.00 Ø, and 2.00 Ø 0.25 nominal Clear Aperture Filter size Mounting Cut-on Wavelength Cut-on Tolerance Blocking Range Transmittance Range Short Wave Pass Filters Short Wave Pass Filter Sets Commercial polish per MIL-PRF-13830B Clear Aperture 0.50" 0.35" (9.0mm) 1.00" 0.79" (20.0mm) 2.00" 1.79" (45.4mm) Black anodized aluminum ring 50% of peak transmittance ±10mm O.D. 3 from 120% of cut-off λ to 1200nm From 415nm to cut-off λ, except SPF-400 and SPF-450 are from 370nm to cut-off λ. Cut-off λ (nm) 0.50 Diameter 1.00 Diameter 2.00 Diameter 400 SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF SPF Wavelength 0.50 Diameter 1.00 Diameter 2.00 Diameter Visible SPFS-VIS-0.50 SPFS-VIS-1.00 SPFS-VIS-2.00 Near IR SPFS-NIR-0.50 SPFS-NIR-1.00 SPFS-NIR-2.00 Visible Short Wave Pass Filter Sets contain 6 filters, one each of the following cut-off wavelengths: 450nm, 500nm, 550nm, 600nm, 650nm, and 700nm. Near IR Short Wave Pass Filter Sets contain 6 filters, one each of the following cut-off wavelengths: 750nm, 800nm, 850nm, 900nm, 950nm, and 1000nm. Filter sets are supplied with a hardwood case and transmission curves of each filter. Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at SPF 307

24 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Interferometer Appendix Mounts Variable Bandpass Filter Sets Transmission vs. Wavelength of Visible Variable Bandpass Filter Sets. Variable Bandpass Filter Sets are available for visible and near IR wavelengths Custom options are available for cut-off and cut-on wavelength and size. Contact a CVI applications engineer for more information. Double Filter Wheels with twelve positions are available l 399 Transmission vs. Wavelength of Near IR Variable Bandpass Filter Sets. Sizes Thickness Surface Figure Surface Quality VPFS 0.50 Ø, 1.00 Ø, and 2.00 Ø 0.25 nominal Clear Aperture Filter size Mounting Cut-on/off Wavelength Cut-on/off Tolerance Commercial polish per MIL-PRF-13830B Clear Aperture 0.50" 0.35" (9.0mm) 1.00" 0.79" (20.0mm) 2.00" 1.79" (45.4mm) Black anodized aluminum ring 50% of peak transmittance ±10mm LPF Blockings From 85% of cut-on λ, to x-ray with the O.D. of 3 SPF Blockings From 120% of cut-off λ, to x-ray with the O.D. of 3 LPF Transmittance Range SPF Transmittance Range Variable Bandpass Filter Sets Up to 2500nm To 415nm, except SPF-400 and SPF-450 are to 370nm. Wavelength 0.50 Diameter 1.00 Diameter 2.00 Diameter Visible VPFS-VIS-0.50 VPFS-VIS-1.00 VPFS-VIS-2.00 Near IR VPFS-NIR-0.50 VPFS-NIR-1.00 VPFS-NIR-2.00 Visible Bandpass Filter Sets contain 6 long wave pass filters and 6 short wave pass filters. Long wave pass filters include one each of the following cut-on wavelengths: 400nm, 450nm, 500nm, 550nm, 600nm, and 650nm. Short wave pass filters include one each of the following cut-off wavelengths: 450nm, 500nm, 550nm, 600nm, 650nm, and 700nm. Near IR Variable Bandpass Filter Sets contain 6 long wave pass filters and 6 short wave pass filters. Long wave pass filters include one each of the following cut-on wavelengths: 750nm, 800nm, 850nm, 900nm, 950nm, and 1000nm. Short wave pass filters include one each of the following cut-off wavelengths: 750nm, 800nm, 850nm, 900nm, 950nm, and 1000nm. 308 VPFS Americas (505) Europe +44 (0) Asia +82 (0) Order now at

25 LP Glass Substitutes Intro Low cost alternative to Color Glass Custom sizes up to 6 in diameter Filter Stack Holders are available l 403 Use LP glass substitute filters when surface figure and damage threshold are not a concern. Material Float glass Sizes 1.00" Ø, 2.00" Ø, and 2.00" x 2.00" square Surface Figure Commercial polish Thicknesses 1.0mm, 2.0mm, 2.5mm, and 3.0mm Surface Quality Both surfaces Clear Aperture Central 90% of dimension Windows Prisms Lenses Glass Substitutes Cut-On Schott Wavelength 1.00 Ø 2.00 Ø 2.00 Square Equivalent 345 LP LP LP-345-2X2 WG LP LP LP-365-2X2 WG LP LP LP-435-2X2 GG LP LP LP-470-2X2 GG LP LP LP-490-2X2 GG LP LP LP-520-2X2 OG LP LP LP-530-2X2 OG LP LP LP-560-2X2 OG LP LP LP-570-2X2 OG LP LP LP-580-2X2 N/A 595 LP LP LP-595-2X2 OG LP LP LP-610-2X2 RG LP LP LP-620-2X2 RG LP LP LP-645-2X2 RG LP LP LP-660-2X2 RG LP LP LP-680-2X2 N/A 695 LP LP LP-695-2X2 RG LP LP LP-720-2X2 RG LP LP LP-745-2X2 N/A 780 LP LP LP-780-2X2 RG780 Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at LP 309

26 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Interferometer Color Process Filters CP Sizes 1.00" Ø, 2.00" Ø, and 2.00" x 2.00" square Double Filter Wheels with twelve positions are available l 399 Filter Stack Holders are available l 403 Color Process Filters Surface Figure Surface Quality Clear Aperture Coating Commercial polish Both surfaces per MIL-PRF-13830B Exceeds central 95% of dimension Dielectric Hard Coating x 2.00 Filter Type Diameter Diameter Square Blue Reflective CP-RB CP-RB CP-RB-475-2X2 Blue Additive CP-AB CP-AB CP-AB-505-2X2 Cyan Subtractive CP-SC CP-SC CP-SC-590-2X2 Green Additive CP-AG CP-AG CP-AG-540-2X2 Yellow Subtractive CP-SY CP-SY CP-SY-520-2X2 Magenta Subtractive CP-SM CP-SM CP-SM-550-2X2 Red Reflective CP-RR CP-RR CP-RR-580-2X2 Red Additive CP-AR CP-AR CP-AR-585-2X2 Color Process Filter Sets available. Contact a CVI applications engineer. Blue Reflective Filter CP-RB Transmittance: Equal to or greater than 85% average from 525nm to 800nm. Equal to or less than 1.0% average from 400nm to 440nm. Reflectance: Equal to or greater than 90% average from 380nm to 450nm. Blue Additive Dichroic Filter CP-AB Transmittance: Equal to or greater than 75% average from 390nm to 480nm. Equal to or less than 1.0% average from 540nm to 750nm. Appendix Mounts Cyan Subtractive Dichroic Filter CP-SC Transmittance: 80% average or greater from 400nm to 550nm. 1.0% average or less from 640nm to 740nm. 310 CP Americas (505) Europe +44 (0) Asia +82 (0) Order now at

27 CP Color Process Filters Intro Green Additive Dichroic Filter CP-AG Transmittance: Equal to or less than 1.0% average from 380nm to 460nm. Equal to or less than 1.0% average from 600nm to 730nm. Peak transmission 70% or greater. Windows Prisms Lenses Yellow Subtractive Dichroic Filter CP-SY Transmittance: 1.0% average or less from 410nm to 475nm. 85% average or greater from 550nm to 750nm. Magenta Subtractive Dichroic Filter CP-SM Transmittance: 80% average or greater from 380nm to 475nm. 1.0% average or less from 535nm to 565nm. 80% average or greater from 650nm to 750nm. Mirrors Beamsplitters Waveplates Polarizers Ultrafast Red Reflective Filter CP-RR Transmittance: Equal to or greater than 85% average from 400nm to 550nm. Equal to or less than 1.0% average from 620nm to 700nm. Reflectance: Equal to or greater than 90% average from 610nm to 725nm. Red Additive Dichroic Filter CP-AR Transmittance: Equal to or greater than 75% average from 610nm to 730nm. Equal to or less than 1.0% average from 380nm to 550nm. Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at CP 311

28 Mirrors Lenses Prisms Windows Intro Schott Color Glass Filters Schott Color Glass Filters are available with antireflection coatings, contact CVI. Custom options are available, contact a CVI applications engineer for more information. For transmittance values at other thicknesses, please contact CVI. Double Filter Wheels with twelve positions are available l 399 CG Material Schott optical glass or equivalent Sizes 1.00" Ø, 2.00" Ø, and 2.00" x 2.00" square Surface Figure Commercial polish Thicknesses 1.0mm, 2.0mm, 2.5mm, and 3.0mm Surface Quality Both surfaces per MIL-PRF-13830B Clear Aperture Central 90% of dimension see graphs next 3 pages Beamsplitters Polarizers Waveplates How To Order CG UG Product Code Glass Type Size Code Thickness Filters Etalons Ultrafast Interferometer Appendix Mounts Schott Color Glass Filters Glass Part Number Type 1.00 Ø 2.00 Ø 2.00 Square KG-1 CG-KG CG-KG CG-KG-1-2X2 KG-2 CG-KG CG-KG CG-KG-2-2X2 KG-3 CG-KG CG-KG CG-KG-3-2X2 KG-4 CG-KG CG-KG CG-KG-4-2X2 KG-5 CG-KG CG-KG CG-KG-5-2X2 UG-1 CG-UG CG-UG CG-UG-1-2X2 UG-5* CG-UG * CG-UG * CG-UG-5-2X2* UG-11* CG-UG * CG-UG * CG-UG-11-2X2* BG-24* CG-BG * CG-BG * CG-BG-24-2X2* BG-3 CG-BG CG-BG CG-BG-3-2X2 BG-25 CG-BG CG-BG CG-BG-25-2X2 BG-12 CG-BG CG-BG CG-BG-12-2X2 BG-7 CG-BG CG-BG CG-BG-7-2X2 BG-26 CG-BG CG-BG CG-BG-26-2X2 BG-23 CG-BG CG-BG CG-BG-23-2X2 BG-28 CG-BG CG-BG CG-BG-28-2X2 BG-38 CG-BG CG-BG CG-BG-38-2X2 BG-18 CG-BG CG-BG CG-BG-18-2X2 BG-40* CG-BG * CG-BG * CG-BG-40-2X2* BG-39 CG-BG CG-BG CG-BG-39-2X2 * Because of the higher cost of some glass, filters with an asterisk will add additional cost to filter set prices. 312 CG Americas (505) Europe +44 (0) Asia +82 (0) Order now at

29 CG Schott Color Glass Filters Intro CG-KG-4 CG-KG-2 CG-KG-1 CG-KG-3 CG-KG-5 CG-UG-1 τ Internal transmittance τ i (λ) for 2mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. τ Internal transmittance τ i (λ) for 1mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons CG-BG-24 CG-UG-5 CG-UG-11 τ Internal transmittance τ i (λ) for 1mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at CG 313

30 Beamsplitters Mirrors Lenses Prisms Windows Intro Schott Color Glass Filters τ Internal transmittance τ i (λ) for 1mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. CG CG-BG-3 Polarizers Waveplates Filters Etalons Ultrafast τ Internal transmittance τ i (λ) for 1mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. CG-BG-25 CG-BG-12 Interferometer Appendix Mounts τ Internal transmittance τ i (λ) for 2mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. CG-BG CG Americas (505) Europe +44 (0) Asia +82 (0) Order now at

31 CG Schott Color Glass Filters Intro CG-BG-26 CG-BG-23 CG-BG-28 CG-BG-38 CG-BG-18 τ Internal transmittance τ i (λ) for 1mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. τ Internal transmittance τ i (λ) for 2mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons CG-BG-40 CG-BG-39 τ Internal transmittance τ i (λ) for 2mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at CG 315

32 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Interferometer Appendix Mounts Schott Color Glass Filters CG Schott Color Glass Filters are available with antireflection coatings, Material Sizes Schott optical glass or equivalent 1.00" Ø, 2.00" Ø, and 2.00" x 2.00" square contact CVI. Surface Figure Commercial polish Custom options are available, contact Thicknesses 1.0mm, 2.0mm, 2.5mm, and 3.0mm a CVI applications engineer for more Surface Quality Both surfaces per MIL-PRF-13830B information. Clear Aperture Central 90% of dimension For transmittance values at other see graphs next page thicknesses, please contact CVI. Filter Stack Holders are How To Order CG OG available l 403 Double Filter Wheels with Product Code twelve positions are available l 399 Glass Type Size Code Thickness Schott Color Glass Filters Glass Part Number Type 1.00 Ø 2.00 Ø 2.00 Square WG-225* CG-WG * CG-WG * CG-WG-225-2X2* WG-280 CG-WG CG-WG CG-WG-280-2X2 WG-295 CG-WG CG-WG CG-WG-295-2X2 WG-305 CG-WG CG-WG CG-WG-305-2X2 WG-320 CG-WG CG-WG CG-WG-320-2X2 GG-385 CG-GG CG-GG CG-GG-385-2X2 GG-395 CG-GG CG-GG CG-GG-395-2X2 GG-400 CG-GG CG-GG CG-GG-400-2X2 GG-420 CG-GG CG-GG CG-GG-420-2X2 GG-435 CG-GG CG-GG CG-GG-435-2X2 GG-455 CG-GG CG-GG CG-GG-455-2X2 GG-475 CG-GG CG-GG CG-GG-475-2X2 GG-495 CG-GG CG-GG CG-GG-495-2X2 OG-515 CG-OG CG-OG CG-OG-515-2X2 OG-530 CG-OG CG-OG CG-OG-530-2X2 OG-550 CG-OG CG-OG CG-OG-550-2X2 OG-570 CG-OG CG-OG CG-OG-570-2X2 OG-590 CG-OG CG-OG CG-OG-590-2X2 RG-610 CG-RG CG-RG CG-RG-610-2X2 RG-630 CG-RG CG-RG CG-RG-630-2X2 RG-645 CG-RG CG-RG CG-RG-645-2X2 RG-665 CG-RG CG-RG CG-RG-665-2X2 RG-695 CG-RG CG-RG CG-RG-695-2X2 RG-715 CG-RG CG-RG CG-RG-715-2X2 RG-780 CG-RG CG-RG CG-RG-780-2X2 RG-830 CG-RG CG-RG CG-RG-830-2X2 RG-850 CG-RG CG-RG CG-RG-850-2X2 RG-9 CG-RG CG-RG CG-RG-9-2X2 RG-1000 CG-RG CG-RG CG-RG X2 * Because of the higher cost of some glass, filters with an asterisk will add additional cost to filter set prices. 316 CG Americas (505) Europe +44 (0) Asia +82 (0) Order now at

33 CG Schott Color Glass Filters Intro CG-GG-385 CG-GG-395 CG-GG-400 CG-GG-420 CG-GG-435 CG-GG-455 CG-GG-475 CG-GG-495 CG-WG-225 CG-WG-280 CG-WG-295 CG-WG-305 CG-WG-320 CG-OG-515 CG-OG-530 CG-OG-550 CG-OG-570 CG-OG-590 CG-RG-610 CG-RG-630 CG-RG-645 τ Internal transmittance τ i (λ) for 2mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. τ Internal transmittance τ i (λ) for 3mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons CG-RG-665 CG-RG-695 CG-RG-715 CG-RG-780 CG-RG-830 CG-RG-850 CG-RG-9 CG-RG-1000 τ Filters Interferometer Mounts Appendix Internal transmittance τ i (λ) for 3mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. Americas (505) Europe +44 (0) Asia +82 (0) Order now at CG 317

34 Polarizers Waveplates Beamsplitters Mirrors Lenses Prisms Windows Intro Schott Color Glass Filter Sets CGFS Material Schott optical glass or equivalent Sizes 1.00" Ø, 2.00" Ø, and 2.00" x 2.00" square Surface Figure Commercial polish Thicknesses 1.0mm, 2.0mm, 2.5mm, and 3.0mm Surface Quality Both surfaces per MIL-PRF-13830B Clear Aperture Central 90% of dimension Select any 10 filters from CVI offers you the convenience of Schott Color Glass Filter Sets pages l selecting your own color glass filter set. Part Number Size Filters highlighted with an asterisk Ten filters may be selected from the CGFS Diameter will add additional cost to the filter CGFS Diameter listings on pages 314 through 319. The set price CGFS-2X Square selected filters are shipped in an attractive Other filter sizes are available wood case. For transmittance values at other thicknesses, please contact CVI. Filter Stack Holders are available l 403 Filter Wheels are available l 399 Appendix Mounts Interferometer Filters Etalons Ultrafast 318 CGFS Americas (505) Europe +44 (0) Asia +82 (0) Order now at

35 ANG, ANGS Absorptive Neutral Density Filters and Filter Sets Intro Absorptive Neutral Density Filters are available individually or as filter sets Custom options are available, contact CVI Filter Stack Holders are available l 403 Filter Wheels are available l 399 Absorptive Neutral Density Filters τ Material Sizes Thickness Surface Figure Surface Quality Clear Aperture (CA) Optical Density Schott optical glass or equivalent 0.50" Ø, 1.00" Ø, 2.00" Ø, and 2.00" x 2.00" square 0.5mm to 3.0mm dependent on O.D. Commercial polish Both surfaces per MIL-PRF-13830B Central 90% of dimension Nominal at 550nm Internal transmittance τ i (λ) for 1mm glass thickness. Graph courtesy of Schott Glass Technologies, Inc. Other thicknesses are also available. For transmittance values at other thicknesses, please contact CVI. Optical Transmittance Glass Density (%) Type 0.50 Diameter 1.00 Diameter 2.00 Diameter 2.00 Square NG12 ANG ANG ANG ANG-5-2X NG11 ANG ANG ANG ANG-10-2X NG11 ANG ANG ANG ANG-14-2X NG11 ANG ANG ANG ANG-15-2X NG11 ANG ANG ANG ANG-20-2X NG5 ANG ANG ANG ANG-27-2X NG11 ANG ANG ANG ANG-30-2X NG5 ANG ANG ANG ANG-40-2X NG5 ANG ANG ANG ANG-50-2X NG4 ANG ANG ANG ANG-57-2X NG5 ANG ANG ANG ANG-60-2X NG4 ANG ANG ANG ANG-70-2X NG5 ANG ANG ANG ANG-80-2X NG4 ANG ANG ANG ANG-90-2X NG3 ANG ANG ANG ANG-100-2X NG3 ANG ANG ANG ANG-105-2X NG3 ANG ANG ANG ANG-130-2X NG9 ANG ANG ANG ANG-140-2X NG3 ANG ANG ANG ANG-150-2X NG3 ANG ANG ANG ANG-200-2X NG10 ANG ANG ANG ANG-240-2X NG3 ANG ANG ANG ANG-250-2X NG3 ANG ANG ANG ANG-300-2X NG1 ANG ANG ANG ANG-400-2X NG1 ANG ANG ANG ANG-500-2X2 Absorptive Neutral Density Filter Sets ANGS-0.50 ANGS-1.00 ANGS-2.00 ANGS-2X2 Absorptive Neutral Density Filter Sets contain 8 filters, one each of the following same size filters: ANG-10, ANG-20, ANG-40, ANG-60, ANG-80, ANG-100, ANG-200, ANG-400. Filter sets are supplied with a hardwood case. Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at ANG 319

36 Beamsplitters Mirrors Lenses Prisms Windows Intro Inconel Neutral Density Filters and Filter Sets Inconel Neutral Density Filters are available individually or as filter sets Custom options are available, contact a CVI applications engineer for more information. Filter Wheels are available l 399 ND, NDS Material Commercial grade glass Sizes 0.50" Ø, 1.00" Ø, 2.00" Ø, and 2.00" x 2.00" square Surface Figure Commercial polish Surface Quality Both surfaces per MIL-PRF-13830B Density Tolerances ±10% of O.D. at 550nm Clear Aperture (CA) Central 90% of dimension Polarizers Waveplates Transmission vs. Wavelength of ND-50 and ND-100 Inconel Neutral Density Filters. Filters Etalons Ultrafast Interferometer Appendix Mounts Inconel Neutral Density Filters Nominal Transmittance Optical Density (%) 0.50 Diameter 1.00 Diameter 2.00 Diameter 2.00 Square ND ND ND ND-10-2X ND ND ND ND-15-2X ND ND ND ND-20-2X ND ND ND ND-30-2X ND ND ND ND-40-2X ND ND ND ND-50-2X ND ND ND ND-60-2X ND ND ND ND-70-2X ND ND ND ND-80-2X ND ND ND ND-90-2X ND ND ND ND-100-2X ND ND ND ND-130-2X ND ND ND ND-150-2X ND ND ND ND-200-2X ND ND ND ND-250-2X ND ND ND ND-300-2X ND ND ND ND-400-2X2 Inconel Neutral Density Filter Sets NDS-0.50 NDS-1.00 NDS-2.00 NDS-2X2 Inconel Neutral Density Filter Sets contain 10 filters, one each of the following filters: ND-10, ND-20, ND-30, ND-40, ND-50, ND-60, ND-70, ND-80, ND-90, and ND-100. Filter sets are supplied with a hardwood case and transmission curves of each filter. 320 ND Americas (505) Europe +44 (0) Asia +82 (0) Order now at

37 NDQ, NDQS Fused Silica Inconel Neutral Density Filters and Filter Sets Intro Material Sizes Surface Figure Surface Quality Density Tolerances Clear Aperture (CA) UV grade fused silica 0.50" Ø, 1.00" Ø, 2.00" Ø, and 2.00" x 2.00" square Commercial polish Both surfaces per MIL-PRF-13830B ±10% of O.D. at 550nm Central 90% of dimension Windows Prisms Transmission vs. Wavelength of NDQ-50 and NDQ-100 Fused Silica Inconel Neutral Density Filters. Lenses Fused Silica Inconel Neutral Density Filters are available individually or as filter sets Custom options are available, contact a CVI applications engineer for more information. Filter Stack Holders are available l 403 Fused Silica Inconel Neutral Density Filters Nominal Transmittance Optical Density (%) 0.50 Diameter 1.00 Diameter 2.00 Diameter 2.00 Square NDQ NDQ NDQ NDQ-10-2X NDQ NDQ NDQ NDQ-15-2X NDQ NDQ NDQ NDQ-20-2X NDQ NDQ NDQ NDQ-30-2X NDQ NDQ NDQ NDQ-40-2X NDQ NDQ NDQ NDQ-50-2X NDQ NDQ NDQ NDQ-60-2X NDQ NDQ NDQ NDQ-70-2X NDQ NDQ NDQ NDQ-80-2X NDQ NDQ NDQ NDQ-90-2X NDQ NDQ NDQ NDQ-100-2X NDQ NDQ NDQ NDQ-130-2X NDQ NDQ NDQ NDQ-150-2X NDQ NDQ NDQ NDQ-200-2X NDQ NDQ NDQ NDQ-250-2X NDQ NDQ NDQ NDQ-300-2X NDQ NDQ NDQ NDQ-400-2X2 Fused Silica Inconel Neutral Density Filter Sets NDQS-0.50 NDQS-1.00 NDQS-2.00 NDQS-2X2 Fused Silica Inconel Neutral Density Filters Sets contain 10 filters, one each of the following filters: NDQ-10, NDQ-20, NDQ-30, NDQ-40, NDQ-50, NDQ-60, NDQ-70, NDQ-80, NDQ-90, and NDQ-100. Filter sets are supplied with a hardwood case and transmission curves of each filter. Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at NDQ 321

38 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Linear Variable Neutral Density Density vs. Distance of LND Variable Neutral Density Filter. Material Thickness Fused silica or BK7 glass 2mm Density Tolerance ± 5% Surface Quality Parallelism Surface Figure Construction Calibrated Wavelength per MIL-PRF-13830B < 3 minutes of arc < 2λ per inch at 632.8nm Single Surface Coating 510nm Linear Variable Neutral Density Filters Linear variable neutral density filters provide variable attenuation as the filter is translated. These filters can be used with white light as well as with low power Linear Variable Neutral Density Filters LNDQ, LND, LSND Optical Density Part Number Range Size Fused Silica LNDQ mm x 25.4mm LNDQ mm x 25.4mm LNDQ mm x 25.4 mm LNDQ mm x 25.4mm LNDQ mm x 25.4mm LNDQ mm x 25.4mm BK7 Glass lasers. A large finite aperture can be attenuated by translating two filters in opposite directions. Low density values are more sensitive to translation position. LND mm x 25.4mm LND mm x 25.4mm LND mm x 25.4mm LND mm x 25.4mm LND mm x 25.4mm LND mm x 25.4mm Interferometer Appendix Mounts Density vs. Distance of LSND Variable Neutral Density Filter. Linear Step Neutral Density Filters Linear step neutral density filters are used for calibrating various illumination systems from 370nm to 2600nm. The filter configuration consists of a spectrally flat Linear Step Neutral Density Filters Size Part Number in mm Steps of Optical Densities BK7 Glass LSND-4.00-A 25.4x LSND-4.00-B 25.4x neutral density metallic coating deposited on a polished glass substrate. Density variations occur in discrete linear steps. CVI supplies linear step neutral density filters with calibration data. LSND-4.00-C 25.4x LNDQ LSND-4.00-D 25.4x LND 322 LSND Americas (505) Europe +44 (0) Asia +82 (0) Order now at

39 CNDQ, CND, CSND Circular Variable Neutral Density Intro Circular Variable Neutral Density Filter Circular Step Neutral Density Filter Density vs. Angular Position of CND Circular Variable Neutral Density Filter. Circular Filter mounts and Circular Degree scales are available l 324 Density vs. Rotation of CSND Circular Step Density Filter. Surface Figure Thickness Mechanical Tolerance Circular Step Neutral Density Filters Circular step neutral density filters are used for calibrating illumination systems from 370nm to 2600nm. The filter consists of a spectrally flat neutral density < 2λ per inch 2mm ± 0.2mm ± 2mm Deviation at End Point ± 5% Linearity of Density ± 5% Parallelism Surface Quality Construction Calibrated Wavelength < 3 minutes of arc per MIL-PRF-13830B Single Surface Coating CSND D 50.0mm CNDQ CND Americas (505) Europe +44 (0) Asia +82 (0) Order now at CSND nm Inside Diameter 7.5mm Circular Variable Neutral Density Filters Circular variable neutral density filters consist of vacuum deposited inconel on a polished glass substrate. Any desired density may be located within a 270 Circular Variable Neutral Density Filters Optical Density Part Number Range Size Fused Silica CNDQ mm CNDQ mm CNDQ mm CNDQ mm CNDQ mm CNDQ mm BK7 Glass Circular Step Neutral Density Filters Outside Part Number Diameter Steps of Optical Densities BK7 Glass CSND A 50.0mm CSND B 50.0mm coated sector. Once calibrated, using spectrophotometer calibration filters or some other suitable method, these filters may be accurately tuned to a known density by rotating the filter to a specific angle. CND mm CND mm CND mm CND mm CND mm CND mm metallic coating deposited on one surface of a circular glass substrate. The density variation takes place in discrete steps as the filter is rotated. CSND C 50.0mm Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons Filters Interferometer Mounts Appendix

40 Mirrors Lenses Prisms Windows Intro Storage Cases, Circular Filter Mounts, and Degree Scales Storage Cases CVI offers sturdy hardwood cases for safe, clean storage of a wide variety of filters. Foam inserts ensure snug, shock-proof support for each filter. Filter Storage Cases Part Number Capacity FSC-1.00 Holds up to Ø filters FSC-2.00 Holds up to Ø or 2.00 x 2.00 filters CF-C-001 Holds up to 8 calibration filters Beamsplitters Polarizers Waveplates Circular Filter Mounts Filters Etalons Ultrafast Universal Stand Circular Degree Scales Circular Filter Mount Interferometer Appendix Mounts CFMD " diameter Degree Scale FSC CFMD " diameter Degree Scale CF-C CFMD " diameter Degree Scale CFM CFMS 324 CFMD Americas (505) Europe +44 (0) Asia +82 (0) Order now at Degree scales are available for all Circular Variable/Step Filters. These scales have an adhesive on one side which attaches to the circular filter. The scales are divided into two degree increments. Circular Filter Mounts and Degree Scales Part Number CFM-0.50 CFMS-1.00 Description Circular Filter Mount, 7.5mm diameter center hole Universal Stand

41 HR, EHR, HT, UR Heat Control Filters Intro Temperature control Use to control NIR energy Filter Stack Holders are available l 403 Material Borafloat glass Sizes 1.00" Ø, 2.00" Ø, and 2.00" x 2.00" square Surface Quality Both surfaces per MIL-PRF-13830B Thickness 3.3mm nominal Clear Aperture Central 90% of dimension Max Operating Temperature 200 C Windows Prisms Transmittance: 85% average at nm (nominal) Reflectance: 90% average at nm (nominal) Use to reflect NIR energy out of beampath. Transmittance: 85% average at nm (nominal) Reflectance: 90% average at nm (nominal) Use to reflect NIR energy out of beampath. Hot Mirrors Part Number Size HR Diameter HR Diameter HR-2X Square Extended Hot Mirrors Part Number Size EHR Diameter EHR Diameter EHR-2X Square Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Transmittance: 85% average at nm (nominal) Reflectance: 90% average at nm (nominal) Use to transmit NIR energy out of beampath. Transmittance: 85% average at nm (nominal) Reflectance: 90% average at nm (nominal) Use to transmit NIR energy out of beampath. Cold Mirrors Part Number HT-1.00 HT-2.00 HT-2X2 UV Cold Mirrors Part Number UR-1.00 UR-2.00 UR-2X2 Size 1.00 Diameter 2.00 Diameter 2.00 Square Size 1.00 Diameter 2.00 Diameter 2.00 Square Etalons Filters Interferometer Mounts Appendix HR EHR HT Americas (505) Europe +44 (0) Asia +82 (0) Order now at UR 325

42 Polarizers Waveplates Beamsplitters Mirrors Lenses Prisms Windows Intro High Energy Dielectric Attenuators All dielectric, non-absorbing attenuators, T + R = 1 Designed for transmissive applications Available Ti:Sapphire wavelengths Ask about optional AR coatings to eliminate fringing effects for narrow wavelength applications High energy attenuator kits available, call CVI Filter Stack Holders are available l 403 HPDA Substrate Material BK7 glass Wavefront Distortion Transmitted - λ/4 at 633nm over central 6mm Ø Reflected - unspecified Thickness 200µm ± 50µm Coating Technology Electron beam multilayer dielectric Adhesion and Durability Per MIL-C-675C. Insoluble in lab solvents. Angle of Incidence 0 ± 10 Housing Black anodized aluminum Damage Threshold 20J/cm 2, 20ns, 20Hz at 1064nm High energy attenuators are designed for transmissive applications where nonabsorbing 6mm diameter. These are intended for use at zero degree incident angle. coating and substrate materials are required. Transmitted wavefront distortion is less than λ/4 over central Warning: reflected energy from uncoated surfaces may cause injury. Filters Etalons Ultrafast Interferometer Appendix Mounts How To Order HPDA Product Code HPDA Wavelength nm 488/ Optical Density Housing Outside Housing Clear Aperture Size Code Diameter Thickness Diameter mm 3.2mm 15.0mm mm 7.1mm 38.1mm 326 HPDA Americas (505) Europe +44 (0) Asia +82 (0) Order now at

43 UVDA High Energy Dielectric UV Attenuators Intro Substrate Material Wavefront Distortion UV grade fused silica Transmitted - λ/4 at 633nm over central 6mm Ø Windows Reflected - unspecified Thickness 200µm ± 50µm Coating Technology Electron beam multilayer dielectric Adhesion and Durability Per MIL-C-675C. Insoluble in lab solvents. Angle of Incidence 0 ± 10 Housing Black anodized aluminum Prisms Lenses Damage Threshold 2J/cm 2, 20ns, 20Hz at 355nm All dielectric, non-absorbing attenuators, T + R = 1 Designed for transmissive applications Ask about optional AR coatings to eliminate fringing effects for narrow wavelength applications High energy attenuator kits available, call CVI Filter Stack Holders are available l 403 High energy attenuators are designed for transmissive applications where nonabsorbing coating and substrate materials are required. Transmitted wavefront distortion is less than λ/4 over central 6mm diameter. These are intended for use at zero degree incident angle. Warning: reflected energy from uncoated surfaces may cause injury. Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons How To Order UVDA Product Code HPDA Wavelength nm Optical Density Housing Outside Housing Clear Aperture Size Code Diameter Thickness Diameter mm 3.2mm 15.0mm mm 7.1mm 38.1mm Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at UVDA 327

44 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Interferometer Spectrophotometer Calibration UV-VIS UV-VIS Spectrophotometer Calibration Filter Sets are designed as secondary spectrophotometer calibration standards for ultraviolet and visible wavelengths. The set consists of three metallic-coated neutral density filters, a Holmium Oxide filter, a blank filter holder, and a hardwood case. The filters are mounted in a cuvettesized holder made of a non-metallic material to protect filters from damage. Nominal neutral density filter transmittance values are 10%, 30%, and 80%. Each filter is individually calibrated for transmittance at 250.0nm, 280.0nm, 340.0nm, 360.0nm, 400.0nm, 465.0nm, 500.0nm, 546.1nm, and 635.0nm. Spectrophotometer calibration filters are primarily used to calibrate various transmittance values and are derived from the National Institute of Standards and Technology (SRM 2031, 2034, etc.). Uncertainty of the transmittance values is ± 1.0%. The calibration will not vary more than ± 1.0% over a period of one year. The Holmium Oxide filter has distinctive transmittance valleys between 279.3nm to 637.5nm. This filter is especially useful for wavelength calibration of spectrophotometers. Each component of this set may be purchased individually. CF Appendix Mounts UV-VIS Spectrophotometer Calibration Sets Part Number Description CFS-UVV-1.00 UV-VIS Spectrophotometer Calibration Set CF-UVV-ND Optical Density (79.4% T) CF-UVV-ND Optical Density (31.6% T) CF-UVV-ND Optical Density (10.0% T) CF-HOF Holmium Oxide Filter CF-BL Blank Filter Holder CF-C-001 Hardwood Filter Case 328 CF Americas (505) Europe +44 (0) Asia +82 (0) Order now at

45 CF Spectrophotometer Calibration Intro VIS VIS Spectrophotometer Calibration Filter Sets are designed as secondary spectrophotometer calibration standards for visible wavelengths. The set consists of four metallic-coated neutral density filters, a Holmium Oxide filter, a blank filter holder, and a hardwood case. The filters are mounted in a cuvettesized holder made of a non-metallic material to protect filters from damage. Nominal neutral density filter transmittance values are 10%, 30%, 50%, and 80%. Each filter is individually calibrated for transmittance at 440.0nm, 465.0nm, 546.1nm, 590.0nm, and 635.0nm. Spectrophotometer calibration filters are primarily used to calibrate various transmittance values and are derived from the National Institute of Standards and Technology (SRM 2031, 2034, etc.). Uncertainty of the transmittance values is within ± 1.0%. The calibration will not vary more than ± 1.0% over the peroid of one year and may be recalibrated at that time. Windows Prisms Lenses Mirrors Beamsplitters Waveplates Polarizers Ultrafast Etalons The Holmium Oxide filter has distinctive transmittance valleys between 279.3nm to 637.5nm. This filter is especially useful for wavelength calibration of spectrophotometers. Each component of this set may be purchased individually. VIS Spectrophotometer Calibration Sets Part Number Description CFS-VIS-1.00 VIS Spectrophotometer Calibration Set CF-VIS-ND Optical Density (79.4% T) CF-VIS-ND Optical Density (50.1% T) CF-VIS-ND Optical Density (31.6% T) CF-VIS-ND Optical Density (10.0% T) CF-HOF Holmium Oxide Filter CF-BL Blank Filter Holder CF-C-001 Hardwood Filter Case Filters Interferometer Mounts Appendix Americas (505) Europe +44 (0) Asia +82 (0) Order now at CF 329

46 Mirrors Lenses Prisms Windows Intro Beamsplitters Polarizers Waveplates Filters Etalons Ultrafast Spectrophotometer Calibration VIS-Wavelength VIS-Wavelength Spectrophotometer Calibration Filter Sets are designed as secondary calibration standards for visible wavelengths. The set consists of a Holmium Oxide filter, a Didymium Oxide filter, a blank filter holder, and a hardwood case. The filters are mounted in a cuvette-sized holder made of a non-metallic material to protect filters from damage. VIS-Wavelength Spectrophotometer Calibration Filters are primarily used for calibrating spectrophotometer wavelengths and are derived from the National Institute of Standards and Technology (SRM 2034 and SRM 2009a). Transmittance values are not certified but wavelengths are certified within ± 0.25nm. The Holmium Oxide filter has distinctive transmittance valleys between 279.3nm to 637.5nm while the Didymium Oxide filter has distinctive valleys between 431.6nm to 748.6nm making these filters suitable for wavelength calibration. Each component of this set may be purchased individually. CF Interferometer Appendix Mounts VIS-Wavelength Spectrophotometer Calibration Sets Part Number Description CFS-HD-1.00 VIS-Wavelength Spectrophotometer Calibration Set CF-HOF Holmium Oxide Filter CF-DOF Didymium Oxide Filter CF-BL Blank Filter Holder CF-C-001 Hardwood Filter Case 330 CF Americas (505) Europe +44 (0) Asia +82 (0) Order now at