Wavelength stabilized multi-kw diode laser systems

Size: px
Start display at page:

Download "Wavelength stabilized multi-kw diode laser systems"

Transcription

1 Wavelength stabilized multi-kw diode laser systems Bernd Köhler *, Andreas Unger, Tobias Kindervater, Simon Drovs, Paul Wolf, Ralf Hubrich, Anna Beczkowiak, Stefan Auch, Holger Müntz, Jens Biesenbach DILAS Diodenlaser GmbH, Galileo-Galilei-Str. 10, Mainz-Hechtsheim, Germany ABSTRACT We report on wavelength stabilized high-power diode laser systems with enhanced spectral brightness by means of Volume Holographic Gratings. High-power diode laser modules typically have a relatively broad spectral width of about 3 to 6 nm. In addition the center wavelength shifts by changing the temperature and the driving current, which is obstructive for pumping applications with small absorption bandwidths. Wavelength stabilization of high-power diode laser systems is an important method to increase the efficiency of diode pumped solid-state lasers. It also enables power scaling by dense wavelength multiplexing. To ensure a wide locking range and efficient wavelength stabilization the parameters of the Volume Holographic Grating and the parameters of the diode laser bar have to be adapted carefully. Important parameters are the reflectivity of the Volume Holographic Grating, the reflectivity of the diode laser bar as well as its angular and spectral emission characteristics. In this paper we present detailed data on wavelength stabilized diode laser systems with and without fiber coupling in the spectral range from 634 nm up to 1533 nm. The maximum output power of 2.7 kw was measured for a fiber coupled system (1000 µm, NA 0.22), which was stabilized at a wavelength of 969 nm with a spectral width of only 0.6 nm (90% value). Another example is a narrow linewidth diode laser stack, which was stabilized at a wavelength of 1533 nm with a spectral bandwidth below 1 nm and an output power of 835 W. Keywords : High power diode laser, wavelength stabilization, Volume Holographic Grating, broad area diode laser, fiber coupling, spectral beam combining 1 INTRODUCTION High-power diode laser systems are well established laser sources for a variety of applications including materials processing and solid state laser pumping. The main advantages of such systems are high wall-plug efficiency, high optical power, reliability, long lifetime, relatively low investment costs and a small footprint. However, besides these numerous advantages, one drawback of high-power diode laser systems is their relatively poor spectral brightness. Typical broad area diode laser bars have a large spectral width of about 3 to 6 nm and the peak wavelength drifts with driving current and temperature. The rapid progress in the fiber laser area has increased the demand for efficient diode pump lasers. For Ytterbium (Yb)- fiber lasers around 1080 nm normally fiber coupled diode laser systems at 915, 940 and 980 nm are used as pump sources. Especially the pump region at 980 nm is important because of the high absorption coefficient in combination with a small absorption bandwidth. To ensure stable and efficient pumping over the whole operating range, it is helpful to control the spectrum of the pump diodes in such a way that the spectral bandwidth of the laser diode is always consistent with the absorption bandwidth of the active laser medium. For Thin Disk Yb:YAG lasers it is beneficial to pump the zero-phonon line at 969 nm to improve beam quality and opticaloptical efficiency because of a smaller quantum defect compared to standard 940 nm pump wavelength 1. Another example which requires a narrow spectral bandwidth for pumping is Nd:YVO 4 at 888 nm, which is advantageous because of its isotropic absorption region with equal absorption coefficients in both polarization directions and the reduced quantum defect compared to the pump region at 808 nm 2. * b.koehler@dilas.de, tel. +49 (0) ; fax +49 (0) ;

2 One of the most demanding application with regard to spectral linewidth is optical pumping of alkali vapor lasers (e.g. rubidium or cesium) which requires a linewidth of about 10 GHz. For these demands spectral control of a diode laser pump source is absolutely mandatory for efficient pumping 3,4,5. In addition to enabling efficient pump sources for solid state lasers wavelength stabilization of high-power diode laser systems also enables power scaling by dense wavelength multiplexing. In recent years the brightness of diode laser bars has been significantly improved mainly by increasing the output power per emitter and by reducing the slow-axis divergence. The development led to the design of new types of diode laser bars with reduced number of emitters and increased pitch between the emitters. These minibars have advantages compared to the traditional 10 mm broad diode laser bars 6. Further brightness enhancement of diode laser systems is achieved by polarization coupling and wavelength multiplexing. Polarization coupling is limited to a factor of 2, whereas wavelength multiplexing is only limited by the number n of available wavelengths. As a matter of course, power scaling by wavelength multiplexing is achieved at the cost of spectral brightness. Wavelength multiplexing with standard broadband diode laser sources and wavelength couplers based on dielectric coatings requires a spectral distance of about 30 nm. Using diode laser sources with stabilized narrow emission spectra and Volume Holographic Gratings as combination elements the spectral distance can be significantly reduced down to 3 nm 7. As a consequence, the number of diode laser bars that can be multiplexed for a given spectral range increases, resulting in an enhancement of brightness. In the next section we will describe some general aspects of wavelength stabilization. 2 GENERAL ASPECTS OF WAVELENGTH STABILIZATION Different methods have been investigated in the past for improving the spectral brightness of broad area diode laser bars. These approaches can be divided into internal and external solutions. For internal solutions the wavelength stabilizing structure is integrated into the diode laser bar itself, whereas for external solutions separate bulk elements with integrated Bragg grating are used for wavelength stabilization. An example for a diode laser bar with internal wavelength stabilization is a distributed feedback diode laser (DFB) where the grating for selective spectral feedback is integrated in the structure of the active region of the laser bar itself. With such a device the wavelength shift with temperature is reduced down to about 0.08 nm/k and in addition the spectral bandwidth is reduced to less than 1 nm 8. It is evident that the fabrication process of such a DFB-diode laser is more complex leading to an increase in costs. Another drawback is the reduced efficiency of a DFB-diode laser, when compared to a standard broad area diode laser bar. In contrast to this internal approach wavelength stabilization by external components has also been investigated. One example for an external wavelength stabilizing element is a thick volume grating based on a photo-thermo-refractive (PTR) inorganic glass 9. Recording of highly efficient Bragg gratings in such photosensitive glass is achieved by periodic variation of the refractive index by UV exposure. Such volume diffractive gratings are commercially available from different vendors with slightly different nomenclatures, like Volume Bragg Grating (VBG) 10, Volume Holographic Grating (VHG) 11 or Reflecting Bragg Grating (RBG) 12. In contrast to the internal solution no modification of the chip structure is required for external wavelength stabilization, i.e. that standard diode laser bars can be used for wavelength stabilization with external Volume Holographic Gratings. This is an important advantage of the external solution. Furthermore, external stabilization leads to a further reduction in temperature drift and spectral bandwidth, when compared to the internal solution. The temperature drift can be reduced down to about 0.01 nm/k and the spectral bandwidth to less than 0.3 nm. However, one important disadvantage of external components is the requirement for sensitive and high-precision alignment of the VHG. A typical setup for a diode laser bar with external stabilization is shown in Fig. 1. Because of the angular sensitivity of the VHG it is advantageous to reduce the divergence of the diode laser bar especially in the fast-axis direction by collimating the beam with a fast-axis collimating lens (FAC). This will significantly increase the optical feedback by the VHG. Collimation of the beam in the slow-axis with a slow-axis collimating lens (SAC) is not mandatory. The VHG is positioned directly behind the FAC. The table in Fig. 1 shows typical alignment tolerances that are required for efficient wavelength stabilization.

3 typical tolerances for rotation x-axis y-axis z-axis ± 0.5 mrad ± 10 mrad ± 10 mrad Fig. 1: Typical setup for a wavelength stabilized diode laser bar with a VHG positioned directly behind the fast-axis collimating lens (FAC). The table shows typical alignment tolerances with respect to the shown setup. For efficient and stable operation of wavelength stabilization all relevant parameters have to be controlled carefully. The parameters of the diode laser bar include the reflectivity of the AR-coating of the output facet, the emitter structure, the cavity length, the smile, the angular emission characteristics and the mounting technology, which has an influence on the wavelength drift with current and temperature. The properties of a VHG are optimized by adapting the refractive index modulation, the spatial frequency and the thickness. These three independent parameters define the Bragg angle, the diffraction efficiency and the spectral and angular selectivity of the grating. In principal, for each configuration these VHG parameters have to be optimized separately. However, based on experience a value for the VHG reflectivity of about 15% is a good starting point for most common diode laser bars. A VHG with a higher reflectivity will increase the locking range at the cost of a higher power loss. This means that optimization of wavelength stabilization will always be a trade-off between locking range and power loss. Furthermore it is important to notice that the optimum reflectivity also depends on the demands of the application. For some applications the VHG has to be optimized for a large locking range, whereas for other applications low losses for fixed operating conditions could be requested. One means to overcome the sensitivity for smile is the integration of the grating structure into the FAC itself 13. Such an element is more insensitive to smile and misalignment. Due to the large angular divergence of the uncollimated beam and the small angular selectivity of the grating only a small part of the beam is reflected back into the diode laser cavity. In the case of misalignment or smile another part of the beam will be reflected to provide feedback. In contrast, for an ideal two component setup with good collimation and no smile nearly all light reflected from the VHG is coupled back into the diode laser cavity. On the other hand this implies that for efficient wavelength locking a significant increase of the reflectivity of the VHG-FAC to about 70% is required. A further advantage of a FAC with integrated VHG is that only one single element has to be handled and aligned. One disadvantage of a VHG-FAC is the relatively low refractive index of the PTR-material, which is typically based on silica (n=1.45). FACs are usually fabricated with high refractive index material like S-TiH53 or N-LAF21. By using low refractive index material, a smaller radius of curvature is required for the same focal length which is disadvantageous with respect to lens aberrations for high NA operation. 3 RESULTS FOR DIFFERENT CONFIGURATIONS In this section we will present different examples for wavelength stabilized diode laser units. In principle, wavelength stabilization is possible for all configurations and operation modes. This includes single diode laser bars, vertical and horizontal diode laser stacks, fiber coupled modules and complete turn-key systems. Operation mode can be continuous wave or pulsed mode (QCW, quasi-continuous wave). 3.1 Single diode laser bars The first example is a single diode laser bar with fast-axis collimation in the red spectral range mounted on a passively cooled heat sink. Wavelength stabilization is achieved by an external VHG at a central wavelength of nm. Fig. 2 shows the output power as a function of the operating current with and without wavelength stabilization (left part) and the corresponding spectra (right part). The maximum output power with stabilization is 4 W at an operating current of 8.5 A

4 and a temperature of 20 C. The peak wavelength of the stabilized spectrum is nm with a spectral bandwidth of less than 0.3 nm (90% power content value), which is significantly less compared to 1.5 nm without wavelength stabilization. The power vs. current characteristics shows that the lasing threshold with stabilization is reduced, which is typical for stabilized diodes because of additional feedback by the external grating. By adding optical elements for collimation and beam shaping fiber coupling of the diode laser bar into a 400 µm fiber with numerical aperture of 0.22 is possible. Fig. 2: Power vs. current curve of a wavelength stabilized diode laser bar with an external VHG at nm (left diagram). The right diagram shows the corresponding spectra with and without wavelength stabilization. For efficient feedback it is advantageous to use a diode bar with collimation in one or both axes and insert the VHG after the collimating optics. However, for some applications, like side-pumped solid-state lasers, diode laser bars without collimation are used. For sufficient feedback the reflectivity of the VHG has to be increased significantly compared to the operation with a collimated beam. Such a setup is comparable to a FAC with integrated VHG where efficiencies of about 70% have to be used (sect. 2). The advantage of a setup without collimating optics is that alignment of the VHG is not critical, but distance to the facet should be minimized. Fig. 3 shows the performance of a wavelength stabilized diode laser bar without collimation. The diode laser bar is operated in QCW-mode with 1.3 % duty cycle (260 µs pulse width, 50 Hz repetition rate) at a temperature of 20 C. Maximum output power is 243 W at a current of 250 A with a corresponding efficiency of 52%. The right part of Fig. 3 shows the spectrum of the stabilized bar at a peak wavelength of nm with a spectral width of less than 1 nm (90% value). Fig. 3: Power vs. current curve of an uncollimated wavelength stabilized diode laser bar with an external VHG at nm (left diagram). The right diagram shows the corresponding spectra with and without wavelength stabilization.

5 3.2 Diode laser stacks One approach for scaling the output power of diode laser units is dense packaging of multiple diode laser bars on heat sinks next to each other (horizontal stack) or on top of each other (vertical stack). A typical setup of a vertical stack is shown in Fig. 4. The vertical stack consists of 30 diode laser bars mounted on actively cooled micro-channel heat sinks. Each bar is individually collimated in fast-axis direction and wavelength stabilized by an external VHG. The total output power is 3375 W at an operating current of 110 A. Overall efficiency with stabilization is above 60 %. The right diagram of Fig. 4 shows the stabilized spectrum at a peak wavelength of nm and a temperature of 25 C. Although 30 individual spectra are combined the total width of the spectrum is below 0.7 nm (90% value). To ensure such small bandwidths even for large stacks the variation of the VHG parameters has to be very low. That is even more important when multiple stacks are combined in one setup. In sum, we built 4 different 30-bar stacks with a very small variation of of only ± 0.25 nm for the stack central wavelength (884.7 nm up to nm). Fig. 4: Power vs. current curve of a wavelength stabilized 30-bar vertical diode laser stack with external VHGs at nm (left diagram). The right diagram shows the corresponding spectra with and without wavelength stabilization. A similar setup of a diode laser stack at a different wavelength of 1533 nm is shown in Fig. 5. The vertical stack consists of 42 diode laser bars mounted on actively cooled micro-channel heat sinks. Each bar is individually collimated in both axes (FAC + SAC) and wavelength stabilized by an external VHG. The total output power is 835 W at an operating current of 60 A. Overall efficiency with stabilization is above 29 %. The right diagram of Fig. 5 shows the stabilized spectrum at a peak wavelength of 1533 nm and a temperature of 25 C. The total width of the spectrum is below 0.9 nm (90% value). Fig. 5: Power vs. current curve of a wavelength stabilized 42-bar vertical diode laser stack with external VHGs at 1533 nm (left diagram). The right diagram shows the corresponding spectrum.

6 3.3 Fiber coupled units In the last few years we developed a modular diode laser concept which is based on a standard building block for a variety of lasers with different output powers and beam qualities 14. According to the modular design principle the baseplates easily can be combined to scale output power, which is realized optically by spatial and / or polarization multiplexing. The advantage of a common baseplate as basic building block for the modular system is that the baseplate can be produced in high volume. The production process for the baseplate is highly automated which leads to a cost-efficient and reliable building block with high repeatability regarding optical properties. As a result pointing errors are minimized which is important for beam quality with regard to fiber coupling or wavelength stabilization, which is possible by using only one Volume Holographic Grating for the whole baseplate. Another important design aspect is that the cooling strategy allows the use of industrial water for the bottom-cooled baseplate. The modular concept is schematically shown in Fig. 6. Starting with a one-plate unit with up to 300 W output power for a 200 µm fiber (NA 0.22) we end up with a laser system consisting of 8 baseplates resulting in 2.2 kw output power for a fiber diameter of 400 µm (NA 0.22) at one single wavelength (without wavelength stabilization).. Fig. 6: Schematic drawing of modular diode laser concept based on one common baseplate. By adding an external VHG for wavelength stabilization of a single plate unit up to 284 W are achieved for a 200 µm NA0.22 fiber at an operating current of 40 A with an overall efficiency of 50%. The wavelength is centered at 976 nm with a spectral bandwidth below 0.5 nm (90% value). Data are shown in Fig. 7 (left part) in combination with results from a long term test (right part). The parameters for the long term test are 284 W output power, 40 A current and 20 C temperature. The total runtime shown in the diagram is 3900 h, which indicates a lifetime of > h, when end of lifetime is defined by 20% power decrease. We have built more than 50 of such units with a mean value of the peak wavelength of nm and a standard deviation of only ± 0.35 nm. Maximum deviation from the peak wavelength is only ± 0.55 nm and mean values for the linewidth are 0.85 nm (90% value) and 0.35 nm (FWHM), respectively.

7 Fig. 7: Power vs. current curve of a wavelength stabilized single plate unit with an external VHG at 976 nm (left diagram). The right diagram shows data of a 3900 h long term test at a current of 40 A and the corresponding spectrum. As mentioned before power scaling is realized by combining several base plates to one common laser unit. Fig. 8 shows the result for a laser unit with four base plates coupled into a 200 µm fiber with NA At an operating current of 40 A a maximum output power of 726 W is achieved with wavelength stabilization and 785 W without wavelength stabilization. The corresponding efficiencies are 40% and 44%, respectively. The right part of Fig. 8 shows the corresponding spectra. The center wavelength of the stabilized spectrum is at nm with a spectral width of only 0.7 nm (90% value), which is a significant reduction compared to the spectral width of 5.6 nm without spectral stabilization. Further power scaling will be achieved by power scaling of the base plate itself and will lead to 1 kw output power for the four-plate unit in the near future. Fig. 8: Power vs. current curve of a four plate unit with and without external wavelength stabilization at 976 nm (left diagram). The right diagram shows the corresponding spectra with and without wavelength stabilization. 3.4 Multi-kW fiber coupled systems The examples in the previous section were based on a modular concept, which uses the tailored bar concept in combination with a baseplate cooled with industrial water. A more compact setup can be realized with DI-water cooled vertical diode laser stacks as described in Sect We have developed a modular platform based on diode laser stacks with standard 10 mm broad diode laser bars, which is suitable for fiber coupling into a 1000 µm NA 0.22 fiber. Fig. 9 shows the result for a unit which is wavelength stabilized at a central wavelength of nm. The maximum output power is 2.3 kw at an operating current of 65 A with a corresponding efficiency of 46%. The peak wavelength is centered at nm with a spectral bandwidth below 0.6 nm (90% value). The diode laser module which is schematically shown in the left part of Fig. 9 can optionally be integrated into a stand-alone 19-inch mounting rack (right part of Fig. 9).

8 Fig. 9: Power vs. current curve of a 1000 µm NA 0.22 fiber coupled laser unit based on vertical diode laser stacks with external wavelength stabilization at nm (left diagram). The right diagram shows the corresponding spectrum. By changing the central wavelength of the VHG the stabilized wavelength easily can be shifted to 969 nm, which is the important zero-phonon pump wavelength for Thin Disk Yb:YAG lasers. Fig. 10 shows the result for such a unit which is wavelength stabilized at a central wavelength of nm. The maximum output power is 2.7 kw at an operating current of 75 A with a corresponding efficiency of 48 %. The peak wavelength is centered at nm with a spectral bandwidth below 0.6 nm (90% value). Fig. 10: Power vs. current curve of a 1000 µm NA 0.22 fiber coupled laser unit based on vertical diode laser stacks with external wavelength stabilization at nm (left diagram). The right diagram shows the corresponding spectrum.

9 4 SUMMARY AND OUTLOOK In conclusion, we have demonstrated efficient and stable wavelength locking for a couple of different configurations. Wavelength stabilization was realized for single bar modules, diode laser stacks and fiber coupled modules with fiber core diameters from 200 µm up to 1000 µm (NA 0.22). We have shown wavelength stabilization for a broad spectral range with different wavelengths from 634 nm to 1533 nm. The maximum output power of a wavelength stabilized fiber coupled system was 2.7 kw out of a 1000 µm fiber (NA 0.22). The center wavelength of this unit was nm with a spectral bandwidth of only 0.6 nm (90% value). In summary, we have pointed out that high-power diode laser modules with enhanced spectral brightness are very attractive devices for more efficient pumping of solid-state lasers with a narrow absorption bandwidth. In addition, such wavelength stabilized devices are important for further scaling the brightness of diode laser systems. In the next few years a further increase in brightness of diode laser systems towards a BPP below 10 mm mrad with multi-kw output power is expected. Dense wavelength multiplexing with wavelength stabilized systems will help to realize these high brightness diode laser modules. We already have demonstrated a polarized output power of 410 W out of a 100 µm NA 0.2 fiber by using such a dense wavelength multiplexing approach 15. Combining several of these units will lead to the goal of a multi-kw diode laser source with a BPP below 10 mm mrad. ACKNOWLEDGEMENTS A part of this work was sponsored by the German Bundesministerium für Bildung und Forschung (BMBF) within the German National Funding Initiative Integrated optical components for High-Power Laser Sources (INLAS). REFERENCES 1. B. Weichelt et. al.; Enhanced performance of thin-disk lasers by pumping into the zero-phonon line ; Optics Letters Vol. 37, pp (2012) 2. L. McDonagh et. al.; High-efficiency 60 W TEM 00 Nd:YVO 4 oscillator pumped at 888 nm ; Optics Letters Vol. 31, pp (2006) 3. A. Gourevitch et. al.; Continuous wave, 30 W laser-diode bar with 10 GHz linewidth for Rb laser pumping ; Optics Letters Vol. 33, pp. 702 (2008) 4. T. Koenning et. al.; Narrow line diode laser stacks for DPAL pumping ; Proc. SPIE Vol. 8962, 89620F (2014) 5. H. Kissel et. al.; High-power diode laser pumps for alkali lasers (DPAL) ; Proc. SPIE Vol. 8241, 82410Q (2012) 6. M. Haag et. al.; Novel high-brightness fiber coupled diode laser device ; Proc. SPIE Vol. 6456, (2007) 7. C. Wessling et. al.; Dense wavelength multiplexing for a high power diode laser ; Proc. SPIE Vol. 6104, (2006) 8. P. Crump et. al.; Reliable operation of 976nm High Power DFB Broad Area Diode Lasers with over 60% Power Conversion Efficiency ; Proc. SPIE Vol. 7953, 79531G (2011) 9. G.B. Venus et. al.; High-brightness narrow-line laser diode source with volume Bragg-grating feedback ; Proc. SPIE Vol. 5711, pp. 166 (2005) 10. B.L. Volodin et. al.; Wavelength stabilization and spectrum narrowing of high-power multimode laser diodes and arrays by use of volume Bragg gratings ; Optics Letters Vol. 29, pp (2004) 11. C. Moser et. al.; Filters to Bragg About ; Photonics Spectra, pp. 82 (June 2005) 12. J. Lumeau et. al.; Tunable narrowband filter based on a combination of Fabry Perot etalon and volume Bragg grating ; Optics Letters Vol. 31, pp (2006) 13. C. Schnitzler et. al.; Wavelength Stabilization of HPDL Array Fast-Axis Collimation Optic with integrated VHG ; Proc. SPIE Vol. 6456, (2007) 14. B. Köhler et. al.; Scalable high-power and high-brightness fiber coupled diode laser devices ; Proc. SPIE Vol. 8241, (2012) 15. A. Unger et. al.; Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kw-class direct diode lasers ; submitted to SPIE Conference 9348, paper (2015)

Scalable high-power and high-brightness fiber coupled diode laser devices

Scalable high-power and high-brightness fiber coupled diode laser devices Scalable high-power and high-brightness fiber coupled diode laser devices Bernd Köhler *, Sandra Ahlert, Andreas Bayer, Heiko Kissel, Holger Müntz, Axel Noeske, Karsten Rotter, Armin Segref, Michael Stoiber,

More information

Tailored bar concepts for 10 mm-mrad fiber coupled modules scalable to kw-class direct diode lasers

Tailored bar concepts for 10 mm-mrad fiber coupled modules scalable to kw-class direct diode lasers Tailored bar concepts for 1 mm-mrad fiber coupled modules scalable to kw-class direct diode lasers Andreas Unger*, Ross Uthoff, Michael Stoiber, Thomas Brand, Heiko Kissel, Bernd Köhler, Jens Biesenbach

More information

Diode laser modules based on new developments in tapered and broad area diode laser bars

Diode laser modules based on new developments in tapered and broad area diode laser bars Diode laser modules based on new developments in tapered and broad area diode laser bars Bernd Köhler *a, Sandra Ahlert a, Thomas Brand a, Matthias Haag a, Heiko Kissel a, Gabriele Seibold a, Michael Stoiber

More information

Wavelength Stabilization of HPDL Array Fast-Axis Collimation Optic with integrated VHG

Wavelength Stabilization of HPDL Array Fast-Axis Collimation Optic with integrated VHG Wavelength Stabilization of HPDL Array Fast-Axis Collimation Optic with integrated VHG C. Schnitzler a, S. Hambuecker a, O. Ruebenach a, V. Sinhoff a, G. Steckman b, L. West b, C. Wessling c, D. Hoffmann

More information

Multi-kW high-brightness fiber coupled diode laser based on two dimensional stacked tailored diode bars

Multi-kW high-brightness fiber coupled diode laser based on two dimensional stacked tailored diode bars Multi-kW high-brightness fiber coupled diode laser based on two dimensional stacked tailored diode bars Andreas Bayer*, Andreas Unger, Bernd Köhler, Matthias Küster, Sascha Dürsch, Heiko Kissel, David

More information

Narrow line diode laser stacks for DPAL pumping

Narrow line diode laser stacks for DPAL pumping Narrow line diode laser stacks for DPAL pumping Tobias Koenning David Irwin, Dean Stapleton, Rajiv Pandey, Tina Guiney, Steve Patterson DILAS Diode Laser Inc. Joerg Neukum Outline Company overview Standard

More information

Optical components for tailoring beam properties of multi-kw diode lasers

Optical components for tailoring beam properties of multi-kw diode lasers Optical components for tailoring beam properties of multi-kw diode lasers Tobias Könning*, Bernd Köhler, Paul Wolf, Andreas Bayer, Ralf Hubrich, Christian Bodem, Nora Plappert, Tobias Kindervater, Wilhelm

More information

High-power, high-brightness and low-weight fiber coupled diode laser device

High-power, high-brightness and low-weight fiber coupled diode laser device High-power, high-brightness and low-weight fiber coupled diode laser device Paul Wolf *, Bernd Köhler, Karsten Rotter, Susanne Hertsch, Heiko Kissel, Jens Biesenbach DILAS Diodenlaser GmbH, Galileo-Galilei-Str.

More information

Narrow-line, tunable, high-power, diode laser pump for DPAL applications

Narrow-line, tunable, high-power, diode laser pump for DPAL applications Narrow-line, tunable, high-power, diode laser pump for DPAL applications Rajiv Pandey* a, David Merchen a, Dean Stapleton a, David Irwin a, Chuck Humble a, Steve Patterson a a DILAS Diode Laser Inc., 9070

More information

High Power Dense Spectral Combination Using Commercially Available Lasers and VHGs

High Power Dense Spectral Combination Using Commercially Available Lasers and VHGs High Power Dense Spectral Combination Using Commercially Available Lasers and VHGs Christophe Moser, CEO Moser@ondax.com Contributors: Gregory Steckman, Frank Havermeyer, Wenhai Liu: Ondax Inc. Christian

More information

Fiber coupled diode laser of high spectral and spatial beam quality with kw class output power

Fiber coupled diode laser of high spectral and spatial beam quality with kw class output power Fiber coupled diode laser of high spectral and spatial beam quality with kw class output power Christian Wessling, Martin Traub, Dieter Hoffmann Fraunhofer Institute for Laser Technology, Aachen, Germany

More information

Ring cavity tunable fiber laser with external transversely chirped Bragg grating

Ring cavity tunable fiber laser with external transversely chirped Bragg grating Ring cavity tunable fiber laser with external transversely chirped Bragg grating A. Ryasnyanskiy, V. Smirnov, L. Glebova, O. Mokhun, E. Rotari, A. Glebov and L. Glebov 2 OptiGrate, 562 South Econ Circle,

More information

High-power semiconductor lasers for applications requiring GHz linewidth source

High-power semiconductor lasers for applications requiring GHz linewidth source High-power semiconductor lasers for applications requiring GHz linewidth source Ivan Divliansky* a, Vadim Smirnov b, George Venus a, Alex Gourevitch a, Leonid Glebov a a CREOL/The College of Optics and

More information

A novel tunable diode laser using volume holographic gratings

A novel tunable diode laser using volume holographic gratings A novel tunable diode laser using volume holographic gratings Christophe Moser *, Lawrence Ho and Frank Havermeyer Ondax, Inc. 85 E. Duarte Road, Monrovia, CA 9116, USA ABSTRACT We have developed a self-aligned

More information

1. INTRODUCTION ABSTRACT

1. INTRODUCTION ABSTRACT Generating a high brightness multi-kilowatt laser by dense spectral combination of VBG stabilized single emitter laser diodes H. Fritsche a*, R. Koch a, B. Krusche a, F. Ferrario a, A. Grohe a, S. Pflueger

More information

High-brightness and high-efficiency fiber-coupled module for fiber laser pump with advanced laser diode

High-brightness and high-efficiency fiber-coupled module for fiber laser pump with advanced laser diode High-brightness and high-efficiency fiber-coupled module for fiber laser pump with advanced laser diode Yohei Kasai* a, Yuji Yamagata b, Yoshikazu Kaifuchi a, Akira Sakamoto a, and Daiichiro Tanaka a a

More information

High brightness semiconductor lasers M.L. Osowski, W. Hu, R.M. Lammert, T. Liu, Y. Ma, S.W. Oh, C. Panja, P.T. Rudy, T. Stakelon and J.E.

High brightness semiconductor lasers M.L. Osowski, W. Hu, R.M. Lammert, T. Liu, Y. Ma, S.W. Oh, C. Panja, P.T. Rudy, T. Stakelon and J.E. QPC Lasers, Inc. 2007 SPIE Photonics West Paper: Mon Jan 22, 2007, 1:20 pm, LASE Conference 6456, Session 3 High brightness semiconductor lasers M.L. Osowski, W. Hu, R.M. Lammert, T. Liu, Y. Ma, S.W. Oh,

More information

3550 Aberdeen Ave SE, Kirtland AFB, NM 87117, USA ABSTRACT 1. INTRODUCTION

3550 Aberdeen Ave SE, Kirtland AFB, NM 87117, USA ABSTRACT 1. INTRODUCTION Beam Combination of Multiple Vertical External Cavity Surface Emitting Lasers via Volume Bragg Gratings Chunte A. Lu* a, William P. Roach a, Genesh Balakrishnan b, Alexander R. Albrecht b, Jerome V. Moloney

More information

According to this the work in the BRIDLE project was structured in the following work packages:

According to this the work in the BRIDLE project was structured in the following work packages: The BRIDLE project: Publishable Summary (www.bridle.eu) The BRIDLE project sought to deliver a technological breakthrough in cost effective, high-brilliance diode lasers for industrial applications. Advantages

More information

Wavelength locking of single emitters and multi-emitter modules: Simulation & Experiments

Wavelength locking of single emitters and multi-emitter modules: Simulation & Experiments Wavelength locking of single emitters and multi-emitter modules: Simulation & Experiments Dan Yanson*, Noam Rappaport, Ophir Peleg, Yuri Berk, Nir Dahan, Genady Klumel, Ilya Baskin, and Moshe Levy. SCD

More information

Dense Spatial Multiplexing Enables High Brightness Multi-kW Diode Laser Systems

Dense Spatial Multiplexing Enables High Brightness Multi-kW Diode Laser Systems Invited Paper Dense Spatial Multiplexing Enables High Brightness Multi-kW Diode Laser Systems Holger Schlüter a, Christoph Tillkorn b, Ulrich Bonna a, Greg Charache a, John Hostetler a, Ting Li a, Carl

More information

High power VCSEL array pumped Q-switched Nd:YAG lasers

High power VCSEL array pumped Q-switched Nd:YAG lasers High power array pumped Q-switched Nd:YAG lasers Yihan Xiong, Robert Van Leeuwen, Laurence S. Watkins, Jean-Francois Seurin, Guoyang Xu, Alexander Miglo, Qing Wang, and Chuni Ghosh Princeton Optronics,

More information

High-brightness pumping has several

High-brightness pumping has several More Efficient and Less Complex ENHANCING THE SPECTRAL AND SPATIAL BRIGHTNESS OF DIODE LASERS Recent breakthroughs in semiconductor laser technology have improved the laser system compactness, efficiency,

More information

11 kw direct diode laser system with homogenized 55 x 20 mm² Top-Hat intensity distribution

11 kw direct diode laser system with homogenized 55 x 20 mm² Top-Hat intensity distribution 11 kw direct diode laser system with homogenized 55 x 20 mm² Top-Hat intensity distribution Bernd Köhler *, Axel Noeske, Tobias Kindervater, Armin Wessollek, Thomas Brand, Jens Biesenbach DILAS Diodenlaser

More information

IST IP NOBEL "Next generation Optical network for Broadband European Leadership"

IST IP NOBEL Next generation Optical network for Broadband European Leadership DBR Tunable Lasers A variation of the DFB laser is the distributed Bragg reflector (DBR) laser. It operates in a similar manner except that the grating, instead of being etched into the gain medium, is

More information

Tapered Amplifiers. For Amplification of Seed Sources or for External Cavity Laser Setups. 750 nm to 1070 nm COHERENT.COM DILAS.

Tapered Amplifiers. For Amplification of Seed Sources or for External Cavity Laser Setups. 750 nm to 1070 nm COHERENT.COM DILAS. Tapered Amplifiers For Amplification of Seed Sources or for External Cavity Laser Setups 750 nm to 1070 nm COHERENT.COM DILAS.COM Welcome DILAS Semiconductor is now part of Coherent Inc. With operations

More information

Narrow-line fiber-coupled modules for DPAL pumping

Narrow-line fiber-coupled modules for DPAL pumping Narrow-line fiber-coupled modules for DPAL pumping Tobias Koenning*, Dan McCormick, David Irwin, Dean Stapleton, Tina Guiney, Steve Patterson DILAS Diode Laser Inc., 9070 South Rita Road, Suite 1500, Tucson

More information

ABSTRACT 1. INTRODUCTION

ABSTRACT 1. INTRODUCTION High spectral contrast filtering produced by multiple pass reflections from paired Bragg gratings in PTR glass Daniel Ott*, Marc SeGall, Ivan Divliansky, George Venus, Leonid Glebov CREOL, College of Optics

More information

Quantum-Well Semiconductor Saturable Absorber Mirror

Quantum-Well Semiconductor Saturable Absorber Mirror Chapter 3 Quantum-Well Semiconductor Saturable Absorber Mirror The shallow modulation depth of quantum-dot saturable absorber is unfavorable to increasing pulse energy and peak power of Q-switched laser.

More information

Lecture 6 Fiber Optical Communication Lecture 6, Slide 1

Lecture 6 Fiber Optical Communication Lecture 6, Slide 1 Lecture 6 Optical transmitters Photon processes in light matter interaction Lasers Lasing conditions The rate equations CW operation Modulation response Noise Light emitting diodes (LED) Power Modulation

More information

Reliable QCW diode laser arrays for operation with high duty cycles

Reliable QCW diode laser arrays for operation with high duty cycles Reliable QCW diode laser arrays for operation with high duty cycles Wilhelm Fassbender* a Heiko Kissel a, Jens Lotz a, Tobias Koenning a, Steve Patterson b and Jens Biesenbach a a Coherent / DILAS Diodenlaser

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Introduction 1-1 Preface Telecommunication lasers have evolved substantially since the introduction of the early AlGaAs-based semiconductor lasers in the late 1970s suitable for transmitting

More information

R. J. Jones Optical Sciences OPTI 511L Fall 2017

R. J. Jones Optical Sciences OPTI 511L Fall 2017 R. J. Jones Optical Sciences OPTI 511L Fall 2017 Semiconductor Lasers (2 weeks) Semiconductor (diode) lasers are by far the most widely used lasers today. Their small size and properties of the light output

More information

The Beam Characteristics of High Power Diode Laser Stack

The Beam Characteristics of High Power Diode Laser Stack IOP Conference Series: Materials Science and Engineering PAPER OPEN ACCESS The Beam Characteristics of High Power Diode Laser Stack To cite this article: Yuanyuan Gu et al 2018 IOP Conf. Ser.: Mater. Sci.

More information

High Brightness kw QCW Diode Laser Stacks with Ultra-low Pitches

High Brightness kw QCW Diode Laser Stacks with Ultra-low Pitches High Brightness kw QCW Diode Laser Stacks with Ultra-low Pitches David Schleuning *, Rajiv Pathak, Calvin Luong, Eli Weiss, and Tom Hasenberg * Coherent Inc., 51 Patrick Henry Drive, Santa Clara, CA 9554

More information

Vertical External Cavity Surface Emitting Laser

Vertical External Cavity Surface Emitting Laser Chapter 4 Optical-pumped Vertical External Cavity Surface Emitting Laser The booming laser techniques named VECSEL combine the flexibility of semiconductor band structure and advantages of solid-state

More information

Thermal tuning of volume Bragg gratings for high power spectral beam combining

Thermal tuning of volume Bragg gratings for high power spectral beam combining Thermal tuning of volume Bragg gratings for high power spectral beam combining Derrek R. Drachenberg, Oleksiy Andrusyak, Ion Cohanoschi, Ivan Divliansky, Oleksiy Mokhun, Alexei Podvyaznyy, Vadim Smirnov,

More information

Laser Diode. Photonic Network By Dr. M H Zaidi

Laser Diode. Photonic Network By Dr. M H Zaidi Laser Diode Light emitters are a key element in any fiber optic system. This component converts the electrical signal into a corresponding light signal that can be injected into the fiber. The light emitter

More information

To generate a broadband light source by using mutually injection-locked Fabry-Perot laser diodes

To generate a broadband light source by using mutually injection-locked Fabry-Perot laser diodes To generate a broadband light source by using mutually injection-locked Fabry-Perot laser diodes Cheng-Ling Ying 1, Yu-Chieh Chi 2, Chia-Chin Tsai 3, Chien-Pen Chuang 3, and Hai-Han Lu 2a) 1 Department

More information

Generation of a Line Focus for Material Processing from an Array of High Power Diode Laser Bars R. Baettig, N. Lichtenstein, R. Brunner, J.

Generation of a Line Focus for Material Processing from an Array of High Power Diode Laser Bars R. Baettig, N. Lichtenstein, R. Brunner, J. Generation of a Line Focus for Material Processing from an Array of High Power Diode Laser Bars R. Baettig, N. Lichtenstein, R. Brunner, J. Müller, B. Valk, M. Kreijci, S. Weiss Overview This slidepack

More information

Ph 77 ADVANCED PHYSICS LABORATORY ATOMIC AND OPTICAL PHYSICS

Ph 77 ADVANCED PHYSICS LABORATORY ATOMIC AND OPTICAL PHYSICS Ph 77 ADVANCED PHYSICS LABORATORY ATOMIC AND OPTICAL PHYSICS Diode Laser Characteristics I. BACKGROUND Beginning in the mid 1960 s, before the development of semiconductor diode lasers, physicists mostly

More information

Development of scalable laser technology for EUVL applications

Development of scalable laser technology for EUVL applications Development of scalable laser technology for EUVL applications Tomáš Mocek, Ph.D. Chief Scientist & Project Leader HiLASE Centre CZ.1.05/2.1.00/01.0027 Lasers for real-world applications Laser induced

More information

External cavities for controling spatial and spectral properties of SC lasers. J.P. Huignard TH-TRT

External cavities for controling spatial and spectral properties of SC lasers. J.P. Huignard TH-TRT External cavities for controling spatial and spectral properties of SC lasers. J.P. Huignard TH-TRT Bright Er - Partners. WP 3 : External cavities approaches for high brightness. - RISOE TUD Dk - Institut

More information

Luminous Equivalent of Radiation

Luminous Equivalent of Radiation Intensity vs λ Luminous Equivalent of Radiation When the spectral power (p(λ) for GaP-ZnO diode has a peak at 0.69µm) is combined with the eye-sensitivity curve a peak response at 0.65µm is obtained with

More information

White Paper Laser Sources For Optical Transceivers. Giacomo Losio ProLabs Head of Technology

White Paper Laser Sources For Optical Transceivers. Giacomo Losio ProLabs Head of Technology White Paper Laser Sources For Optical Transceivers Giacomo Losio ProLabs Head of Technology September 2014 Laser Sources For Optical Transceivers Optical transceivers use different semiconductor laser

More information

Introduction Fundamentals of laser Types of lasers Semiconductor lasers

Introduction Fundamentals of laser Types of lasers Semiconductor lasers ECE 5368 Introduction Fundamentals of laser Types of lasers Semiconductor lasers Introduction Fundamentals of laser Types of lasers Semiconductor lasers How many types of lasers? Many many depending on

More information

High Average Power, High Repetition Rate Side-Pumped Nd:YVO 4 Slab Laser

High Average Power, High Repetition Rate Side-Pumped Nd:YVO 4 Slab Laser High Average Power, High Repetition Rate Side-Pumped Nd:YVO Slab Laser Kevin J. Snell and Dicky Lee Q-Peak Incorporated 135 South Rd., Bedford, MA 173 (71) 75-9535 FAX (71) 75-97 e-mail: ksnell@qpeak.com,

More information

Large aperture tunable ultra narrow band Fabry-Perot-Bragg filter

Large aperture tunable ultra narrow band Fabry-Perot-Bragg filter Large aperture tunable ultra narrow band Fabry-Perot-Bragg filter Julien Lumeau *, Vadim Smirnov, Fabien Lemarchand 3, Michel Lequime 3 and Leonid B. Glebov School of Optics/CREOL, University of Central

More information

THE TUNABLE LASER LIGHT SOURCE C-WAVE. HÜBNER Photonics Coherence Matters.

THE TUNABLE LASER LIGHT SOURCE C-WAVE. HÜBNER Photonics Coherence Matters. THE TUNABLE LASER LIGHT SOURCE HÜBNER Photonics Coherence Matters. FLEXIBILITY WITH PRECISION is the tunable laser light source for continuous-wave (cw) emission in the visible and near-infrared wavelength

More information

Publishable final activity report

Publishable final activity report Publishable final activity report Project execution Introduction Diode lasers are more efficient than any other laser and feature the highest reliability. They are already very strong contenders in the

More information

Longitudinal mode selection in laser cavity by moiré volume Bragg grating

Longitudinal mode selection in laser cavity by moiré volume Bragg grating Longitudinal mode selection in laser cavity by moiré volume Bragg grating Daniel Ott* a, Vasile Rotar a, Julien Lumeau a, Sergiy Mokhov a, Ivan Divliansky a, Aleksandr Ryasnyanskiy b, Nikolai Vorobiev

More information

High-frequency tuning of high-powered DFB MOPA system with diffraction limited power up to 1.5W

High-frequency tuning of high-powered DFB MOPA system with diffraction limited power up to 1.5W High-frequency tuning of high-powered DFB MOPA system with diffraction limited power up to 1.5W Joachim Sacher, Richard Knispel, Sandra Stry Sacher Lasertechnik GmbH, Hannah Arendt Str. 3-7, D-3537 Marburg,

More information

1450-nm high-brightness wavelength-beam combined diode laser array

1450-nm high-brightness wavelength-beam combined diode laser array 1450-nm high-brightness wavelength-beam combined diode laser array Juliet T. Gopinath, Bien Chann, T.Y. Fan, and Antonio Sanchez-Rubio Lincoln Laboratory, Massachusetts Institute of Technology, Lexington,

More information

Effects of spherical aberrations on micro welding of glass using ultra short laser pulses

Effects of spherical aberrations on micro welding of glass using ultra short laser pulses Available online at www.sciencedirect.com Physics Procedia 39 (2012 ) 563 568 LANE 2012 Effects of spherical aberrations on micro welding of glass using ultra short laser pulses Kristian Cvecek a,b,, Isamu

More information

PROJECT FINAL REPORT

PROJECT FINAL REPORT PROJECT FINAL REPORT Grant Agreement number: 314719 Project acronym: Project title: Funding Scheme: BRIDLE Brilliant Industrial Diode Laser FP7-2012-NMP-ICT-FoF Period covered: from 01.09.2012 to 29.02.2016

More information

CHAPTER 5 FINE-TUNING OF AN ECDL WITH AN INTRACAVITY LIQUID CRYSTAL ELEMENT

CHAPTER 5 FINE-TUNING OF AN ECDL WITH AN INTRACAVITY LIQUID CRYSTAL ELEMENT CHAPTER 5 FINE-TUNING OF AN ECDL WITH AN INTRACAVITY LIQUID CRYSTAL ELEMENT In this chapter, the experimental results for fine-tuning of the laser wavelength with an intracavity liquid crystal element

More information

Grating-waveguide structures and their applications in high-power laser systems

Grating-waveguide structures and their applications in high-power laser systems Grating-waveguide structures and their applications in high-power laser systems Marwan Abdou Ahmed*, Martin Rumpel, Tom Dietrich, Stefan Piehler, Benjamin Dannecker, Michael Eckerle, and Thomas Graf Institut

More information

Important performance parameters when considering lasers for holographic applications

Important performance parameters when considering lasers for holographic applications Important performance parameters when considering lasers for holographic applications E.K. Illy*, H. Karlsson & G. Elgcrona. Cobolt AB, a part of HÜBNER Photonics, Vretenvägen 13, 17154, Stockholm, Sweden.

More information

Stable dual-wavelength oscillation of an erbium-doped fiber ring laser at room temperature

Stable dual-wavelength oscillation of an erbium-doped fiber ring laser at room temperature Stable dual-wavelength oscillation of an erbium-doped fiber ring laser at room temperature Donghui Zhao.a, Xuewen Shu b, Wei Zhang b, Yicheng Lai a, Lin Zhang a, Ian Bennion a a Photonics Research Group,

More information

Machine Tool Order Intake in Germany Real changes against the previous year in %

Machine Tool Order Intake in Germany Real changes against the previous year in % Brilliant Performance Efficiency, Power, Brightness, Reliability of nlight Diode Laser Systems Kirk, Rob, Frank, Ingolf, others? Current economic situation: (might skip as total debrief) We are in the

More information

Simply Brighter. Contact. 30 Upton Drive Wilmington, MA

Simply Brighter. Contact. 30 Upton Drive Wilmington, MA Simply Brighter Contact 30 Upton Drive Wilmington, MA 01887 info@teradiode.com 978.988.1040 www.teradiode.com TeraDiode is commercializing ground-breaking technology pioneered at MIT Lincoln Laboratory

More information

Diode laser systems for 1.8 to 2.3 µm wavelength range

Diode laser systems for 1.8 to 2.3 µm wavelength range Diode laser systems for 1.8 to 2.3 µm wavelength range Márc T. Kelemen 1, Jürgen Gilly 1, Rudolf Moritz 1, Jeanette Schleife 1, Matthias Fatscher 1, Melanie Kaufmann 1, Sandra Ahlert 2, Jens Biesenbach

More information

Improving the Collection Efficiency of Raman Scattering

Improving the Collection Efficiency of Raman Scattering PERFORMANCE Unparalleled signal-to-noise ratio with diffraction-limited spectral and imaging resolution Deep-cooled CCD with excelon sensor technology Aberration-free optical design for uniform high resolution

More information

High-Power Femtosecond Lasers

High-Power Femtosecond Lasers High-Power Femtosecond Lasers PHAROS is a single-unit integrated femtosecond laser system combining millijoule pulse energies and high average power. PHAROS features a mechanical and optical design optimized

More information

Vertical-Cavity Surface-Emitting Laser Technology

Vertical-Cavity Surface-Emitting Laser Technology Vertical-Cavity Surface-Emitting Laser Technology Introduction Vertical-Cavity Surface-Emitting Lasers (VCSELs) are a relatively recent type of semiconductor lasers. VCSELs were first invented in the mid-1980

More information

Wavelength Control and Locking with Sub-MHz Precision

Wavelength Control and Locking with Sub-MHz Precision Wavelength Control and Locking with Sub-MHz Precision A PZT actuator on one of the resonator mirrors enables the Verdi output wavelength to be rapidly tuned over a range of several GHz or tightly locked

More information

Thin-Disc-Based Driver

Thin-Disc-Based Driver Thin-Disc-Based Driver Jochen Speiser German Aerospace Center (DLR) Institute of Technical Physics Solid State Lasers and Nonlinear Optics Folie 1 German Aerospace Center! Research Institution! Space Agency!

More information

Single Frequency DPSS Lasers

Single Frequency DPSS Lasers Single Frequency DPSS Lasers Any wavelength from NIR to UV using a single engineering platform based on our proprietary patented BRaMMS DPSS Laser technology. We develop and produce Single Frequency DPSS

More information

A Narrow-Band Tunable Diode Laser System with Grating Feedback

A Narrow-Band Tunable Diode Laser System with Grating Feedback A Narrow-Band Tunable Diode Laser System with Grating Feedback S.P. Spirydovich Draft Abstract The description of diode laser was presented. The tuning laser system was built and aligned. The free run

More information

High Power and Energy Femtosecond Lasers

High Power and Energy Femtosecond Lasers High Power and Energy Femtosecond Lasers PHAROS is a single-unit integrated femtosecond laser system combining millijoule pulse energies and high average powers. PHAROS features a mechanical and optical

More information

taccor Optional features Overview Turn-key GHz femtosecond laser

taccor Optional features Overview Turn-key GHz femtosecond laser taccor Turn-key GHz femtosecond laser Self-locking and maintaining Stable and robust True hands off turn-key system Wavelength tunable Integrated pump laser Overview The taccor is a unique turn-key femtosecond

More information

Technical Brief #2. Depolarizers

Technical Brief #2. Depolarizers Technical Brief #2 Depolarizers What is a depolarizer?...2 Principle of operation...2 Source coherence function dependence...2 Depolarizer realization...3 Input linear polarization state definition...4

More information

TL2 Technology Developer User Guide

TL2 Technology Developer User Guide TL2 Technology Developer User Guide The Waveguide available for sale now is the TL2 and all references in this section are for this optic. Handling and care The TL2 Waveguide is a precision instrument

More information

Concepts for High Power Laser Diode Systems

Concepts for High Power Laser Diode Systems Concepts for High Power Laser Diode Systems 1. Introduction High power laser diode systems is a new development within the field of laser diode systems. Pioneer of such laser systems was SDL, Inc. which

More information

BN 1000 May Profile Optische Systeme GmbH Gauss Str. 11 D Karlsfeld / Germany. Tel Fax

BN 1000 May Profile Optische Systeme GmbH Gauss Str. 11 D Karlsfeld / Germany. Tel Fax BN 1000 May 2000 Profile Optische Systeme GmbH Gauss Str. 11 D - 85757 Karlsfeld / Germany Tel + 49 8131 5956-0 Fax + 49 8131 5956-99 info@profile-optsys.com www.profile-optsys.com Profile Inc. 87 Hibernia

More information

Q-switched resonantly diode-pumped Er:YAG laser

Q-switched resonantly diode-pumped Er:YAG laser Q-switched resonantly diode-pumped Er:YAG laser Igor Kudryashov a) and Alexei Katsnelson Princeton Lightwave Inc., 2555 US Route 130, Cranbury, New Jersey, 08512 ABSTRACT In this work, resonant diode pumping

More information

HIGH POWER LASERS FOR 3 RD GENERATION GRAVITATIONAL WAVE DETECTORS

HIGH POWER LASERS FOR 3 RD GENERATION GRAVITATIONAL WAVE DETECTORS HIGH POWER LASERS FOR 3 RD GENERATION GRAVITATIONAL WAVE DETECTORS P. Weßels for the LZH high power laser development team Laser Zentrum Hannover, Germany 23.05.2011 OUTLINE Requirements on lasers for

More information

Semiconductor Optical Communication Components and Devices Lecture 18: Introduction to Diode Lasers - I

Semiconductor Optical Communication Components and Devices Lecture 18: Introduction to Diode Lasers - I Semiconductor Optical Communication Components and Devices Lecture 18: Introduction to Diode Lasers - I Prof. Utpal Das Professor, Department of lectrical ngineering, Laser Technology Program, Indian Institute

More information

Tutorial. Various Types of Laser Diodes. Low-Power Laser Diodes

Tutorial. Various Types of Laser Diodes. Low-Power Laser Diodes 371 Introduction In the past fifteen years, the commercial and industrial use of laser diodes has dramatically increased with some common applications such as barcode scanning and fiber optic communications.

More information

Kilowatt Class High-Power CW Yb:YAG Cryogenic Laser

Kilowatt Class High-Power CW Yb:YAG Cryogenic Laser Kilowatt Class High-Power CW Yb:YAG Cryogenic Laser D.C. Brown, J.M. Singley, E. Yager, K. Kowalewski, J. Guelzow, and J. W. Kuper Snake Creek Lasers, LLC, Hallstead, PA 18822 ABSTRACT We discuss progress

More information

External-Cavity Tapered Semiconductor Ring Lasers

External-Cavity Tapered Semiconductor Ring Lasers External-Cavity Tapered Semiconductor Ring Lasers Frank Demaria Laser operation of a tapered semiconductor amplifier in a ring-oscillator configuration is presented. In first experiments, 1.75 W time-average

More information

Widely tunable Yb:KYW laser with a volume Bragg grating

Widely tunable Yb:KYW laser with a volume Bragg grating Widely tunable Yb:KYW laser with a volume Bragg grating Björn Jacobsson, Jonas E. Hellström, Valdas Pasiskevicius and Fredrik Laurell Laser physics, KTH Royal Institute of Technology, 106 91 Stockholm,

More information

LOPUT Laser: A novel concept to realize single longitudinal mode laser

LOPUT Laser: A novel concept to realize single longitudinal mode laser PRAMANA c Indian Academy of Sciences Vol. 82, No. 2 journal of February 2014 physics pp. 185 190 LOPUT Laser: A novel concept to realize single longitudinal mode laser JGEORGE, KSBINDRAand SMOAK Solid

More information

Photonics and Optical Communication

Photonics and Optical Communication Photonics and Optical Communication (Course Number 300352) Spring 2007 Dr. Dietmar Knipp Assistant Professor of Electrical Engineering http://www.faculty.iu-bremen.de/dknipp/ 1 Photonics and Optical Communication

More information

Conduction-Cooled Bar Packages (CCPs), nm

Conduction-Cooled Bar Packages (CCPs), nm Conduction-Cooled Bar Packages (CCPs), 780-830 nm High Power Single-Bar Packages for Pumping and Direct-Diode Applications Based on Coherent s legendary Aluminum-free Active Area (AAA ) epitaxy, Coherent

More information

US-Patent 5,867,512 US-Patent 6,297,066 Power and Stability High Powered Littman / Metcalf External Cavity Diode Laser http://www.sacher-laser.com How does our Laser achieve high stability? Initial State

More information

Surface-Emitting Single-Mode Quantum Cascade Lasers

Surface-Emitting Single-Mode Quantum Cascade Lasers Surface-Emitting Single-Mode Quantum Cascade Lasers M. Austerer, C. Pflügl, W. Schrenk, S. Golka, G. Strasser Zentrum für Mikro- und Nanostrukturen, Technische Universität Wien, Floragasse 7, A-1040 Wien

More information

Tutorial Zemax 9: Physical optical modelling I

Tutorial Zemax 9: Physical optical modelling I Tutorial Zemax 9: Physical optical modelling I 2012-11-04 9 Physical optical modelling I 1 9.1 Gaussian Beams... 1 9.2 Physical Beam Propagation... 3 9.3 Polarization... 7 9.4 Polarization II... 11 9 Physical

More information

Features. Applications. Optional Features

Features. Applications. Optional Features Features Compact, Rugged Design TEM Beam with M 2 < 1.2 Pulse Rates from Single Shot to 15 khz IR, Green, UV, and Deep UV Wavelengths Available RS232 Computer Control Patented Harmonic Generation Technology

More information

Data sheet for TDS 10XX system THz Time Domain Spectrometer TDS 10XX

Data sheet for TDS 10XX system THz Time Domain Spectrometer TDS 10XX THz Time Domain Spectrometer TDS 10XX TDS10XX 16/02/2018 www.batop.de Page 1 of 11 Table of contents 0. The TDS10XX family... 3 1. Basic TDS system... 3 1.1 Option SHR - Sample Holder Reflection... 4 1.2

More information

A 100 W all-fiber linearly-polarized Yb-doped single-mode fiber laser at 1120 nm

A 100 W all-fiber linearly-polarized Yb-doped single-mode fiber laser at 1120 nm A 1 W all-fiber linearly-polarized Yb-doped single-mode fiber laser at 112 nm Jianhua Wang, 1,2 Jinmeng Hu, 1 Lei Zhang, 1 Xijia Gu, 3 Jinbao Chen, 2 and Yan Feng 1,* 1 Shanghai Key Laboratory of Solid

More information

Active mode-locking of miniature fiber Fabry-Perot laser (FFPL) in a ring cavity

Active mode-locking of miniature fiber Fabry-Perot laser (FFPL) in a ring cavity Active mode-locking of miniature fiber Fabry-Perot laser (FFPL) in a ring cavity Shinji Yamashita (1)(2) and Kevin Hsu (3) (1) Dept. of Frontier Informatics, Graduate School of Frontier Sciences The University

More information

High efficiency laser sources usable for single mode fiber coupling and frequency doubling

High efficiency laser sources usable for single mode fiber coupling and frequency doubling High efficiency laser sources usable for single mode fiber coupling and frequency doubling Patrick Friedmann, Jeanette Schleife, Jürgen Gilly and Márc T. Kelemen m2k-laser GmbH, Hermann-Mitsch-Str. 36a,

More information

Continuous-Wave (CW) Single-Frequency IR Laser. NPRO 125/126 Series

Continuous-Wave (CW) Single-Frequency IR Laser. NPRO 125/126 Series Continuous-Wave (CW) Single-Frequency IR Laser NPRO 125/126 Series www.lumentum.com Data Sheet The Lumentum NPRO 125/126 diode-pumped lasers produce continuous-wave (CW), singlefrequency output at either

More information

Photonic Crystal Fiber Interfacing. In partnership with

Photonic Crystal Fiber Interfacing. In partnership with Photonic Crystal Fiber Interfacing In partnership with Contents 4 Photonics Crystal Fibers 6 End-capping 8 PCF connectors With strong expertise in designing fiber lasers and fused fiber components, ALPhANOV,

More information

dnx/dt = -9.3x10-6 / C dny/dt = -13.6x10-6 / C dnz/dt = ( λ)x10-6 / C

dnx/dt = -9.3x10-6 / C dny/dt = -13.6x10-6 / C dnz/dt = ( λ)x10-6 / C Lithium Triborate Crystal LBO Lithium triborate (LiB3O5 or LBO) is an excellent nonlinear optical crystal for many applications. It is grown by an improved flux method. AOTK s LBO is Featured by High damage

More information

Continuous Wave (CW) Single-Frequency IR Laser NPRO 125/126 Series

Continuous Wave (CW) Single-Frequency IR Laser NPRO 125/126 Series COMMERCIAL LASERS Continuous Wave (CW) Single-Frequency IR Laser NPRO 125/126 Series Key Features 1319 or 1064 nm outputs available Fiber-coupled output Proven nonplanar ring oscillator (NPRO) design Superior

More information

High Power Thin Disk Lasers. Dr. Adolf Giesen. German Aerospace Center. Institute of Technical Physics. Folie 1. Institute of Technical Physics

High Power Thin Disk Lasers. Dr. Adolf Giesen. German Aerospace Center. Institute of Technical Physics. Folie 1. Institute of Technical Physics High Power Thin Disk Lasers Dr. Adolf Giesen German Aerospace Center Folie 1 Research Topics - Laser sources and nonlinear optics Speiser Beam control and optical diagnostics Riede Atm. propagation and

More information

Kit for building your own THz Time-Domain Spectrometer

Kit for building your own THz Time-Domain Spectrometer Kit for building your own THz Time-Domain Spectrometer 16/06/2016 1 Table of contents 0. Parts for the THz Kit... 3 1. Delay line... 4 2. Pulse generator and lock-in detector... 5 3. THz antennas... 6

More information

VERTICAL CAVITY SURFACE EMITTING LASER

VERTICAL CAVITY SURFACE EMITTING LASER VERTICAL CAVITY SURFACE EMITTING LASER Nandhavel International University Bremen 1/14 Outline Laser action, optical cavity (Fabry Perot, DBR and DBF) What is VCSEL? How does VCSEL work? How is it different

More information