Talbot bands in the theory and practice of optical coherence tomography
|
|
- Charla Watson
- 5 years ago
- Views:
Transcription
1 Talbot bands in the theory and practice of optical coherence tomography A. Gh. Podoleanu Applied Optics Group, School of Physical Sciences, University of Kent, CT2 7NH, Canterbury, UK
2 Presentation is based on results obtained during supervision of research performed by: PhD students Daniel Woods and Michael Hughes and postdoctoral researcher Adrian Bradu
3 Content Justification of study Conventional channelled spectrum OCT or Fourier domain-oct, or camera based Talbot bands Comments on their value for FD-OCT
4 Broadband optical source CHANNELLED SPECTRUM [OR FOURIER DOMAIN (FD)] OCT Reference Mirror L1 BS RB X OB Object Mirror Z CCD Diffraction Grating INTERFEROMETER+ SPECTROMETER L2 Electrical Spectrum Analyzer
5 DISADVANTAGES OF SPECTRAL DOMAIN OCT (i) Visibility decay with depth; (iii) Mirror terms (same spectrum modulation for positive and negative OPD values); (ii) Dynamic focus not possible.
6 Mirror terms in OCT equivalent to OPD sign ambiguity in sensing FD-OCT image from a real-valued spectral interferogram consists of two overlapped images that are symmetrical with respect to the zero plane (zero-phase delay) of the interferometer; The zero plane must be positioned outside the imaged sample which reduces the imaging depth range to less than half.
7 So far, the decay of sensitivity with depth was considered a consequence of the limited spectral resolution of the spectrometer We will show here that this has a more fundamental origin We will also show that the curve of sensitivity with depth and the mirror terms are inter-related
8 Phase-shifting methods allow acquisition of the complex spectral interferogram to be obtained in a multiframe sequence. However, in practice the complex conjugate rejection ratio is limited by the accuracy of the phase steps and also by the mechanical stability of the interferometer and the sample during the acquisition time of the frame sequence.
9 In Y. Yasuno, S. Makita, T. Endo, G. Aoki, H. Sumimura, M. Itoh, and T. Yatagai, "One-shotphase-shifting Fourier domain optical coherence tomography by reference wavefront tilting, two phase shifted spectra are recorded simultaneously on different lines of an area detector. requires an area detector which reduces speed performance and the light efficiency is critical.
10 Using a 3x3 splitter
11 3x3 fiber couplers The detection of the complex interferogram using 3x3 fiber couplers as phase-shifting elements allows simultaneous detection of the real and imaginary components of the spectral interferogram. This requires two separate detectors for acquiring the quadrature components. Slight misalignments in matching the spectrometers (in the case of broadband FD-OCT) and uneven wavelengthdependent splitting ratios in the coupler limit the suppression of the complex conjugate artifacts.
12 Opt. Express, 14/ 4, (2006), Beating frequency generated by two AO frequency shifters Beating signal frequency is the same for all wavelengths allowing for achromatic complex reconstruction Complex system, calculations required
13 R. A. Leitgeb, C. K. Hitzenberger, and A. F. Fercher, Phase shifting algorithm to achieve high speed long depth range probing by frequency domain optical coherence tomography, Opt. Lett. 28, (2003). E. Götzinger, M. Pircher, R. Leitgeb, and C. Hitzenberger, "High speed full range complex spectral domain optical coherence tomography," Opt. Express 13, (2005),
14 Cancellation methods All previous methods to reduce the mirror terms are cancellation methods They require several measurements which are either performed: simultaneously, such as in the case of a 3x3 coupler method, or the heterodyne method using frequency shifters or sequentially, such as in the case of phase shifting.
15 Using several measurements, the mirror term are reduced or eliminated. Therefore they require stability of the parameters. If the sample moves (the eye), instabilities, errors, mismatches lead to limited attenuation of the mirror term The reported maximum complex conjugate rejection ratio is 20 db 50 db.
16 TALBOT BANDS Talbot Bands describe a curious effect, [F. Talbot, An experiment on the interference of light, Philos. Mag. 10, 364 (1837)], when a beam from a white light source was analyzed spectrally using a prism. By inserting a glass plate halfway into the beam, dark bands were produced when the plate was inserted so as to intercept a certain side of the beam only. If the plate was inserted halfway into the beam from a direction corresponding to the red end of the dispersed spectrum dark bands (Talbot Bands) were observed. If the plate was inserted from the opposite side of the beam (corresponding to the blue end of the spectrum), no bands were observed
17 Historic G. B. Airy, The Bakerian Lecture on the theoretical explanation of an apparent new polarity in light, Phil. Trans. R. Soc. London 130, , (1840), dispelled any curious effects as mere results of interference which enhances the amplitude of some wavelengths and reduces the amplitude of others.
18 DEMONSTRATION OF TALBOT BANDS SPECTROMETER SLD BEAM TOWARDS THE GRATING CCD LENS SFM GRATING 2011
19 Optical beam Glass plate
20 Glass plate Intersecting the Right of the beam no bands are obtained
21 Glass plate Intersecting the Left of the beam, Talbot Bands are obtained
22 Difference between Left and Right side of an optical beam Modulation of the spectrum arises when the glass plate intersects a certain side of the beam!?!?!?!?
23 Properties of Talbot Bands The density of bands is proportional to the thickness of glass and its index of refraction. Talbot bands exhibit a symmetric-triangular relationship between band visibility and plate thickness: A maximum visibility is observed at a thickness dependent on the beam width; Visibility goes to zero near a plate thickness of zero and also as the thickness exceeds twice the value at which the maximum occurs.
24 VISIBILITY OF TALBOT BAND 1 l c Optimum thickness Maximum thickness OPD t opt 2t opt VISIBILITY RESTRICTED TO ONE SIGN OF OPD ONLY
25 By diffraction (dispersion), coherence length increases In the Bragg maximum of order n, the difference in path from one grating line to the next is nλ: For an incoming beam exciting N grating lines, the diffracted beam is made of N pulses, delayed in between by nλ. This equates to an increase in the coherence length of the diffracted wave from l c to nnλ. A. Gh. Podoleanu, Unique interpretation of Talbot Bands and Fourier domain white light interferometry Opt. Express, 2007, Vol. 15,
26 Right Left Right lc Extended Extended wavetrain wavetrain length length Tilt of the wavefront Left
27 CL DIFFRACTION GRATING Ω β No glass plate, No overlap, no bands -1 0 A``
28 CL DIFFRACTION GRATING Ω β Thin plate Some overlap, bands of intensity proportional to the amount of overlap -1 0 A``
29 CL DIFFRACTION GRATING Ω β Optimum thickness Total overlap, Maximum intensity bands -1 0 A``
30 CL DIFFRACTION GRATING Ω β Thickness larger than optimum, Less intensity -1 0 A``
31 CL DIFFRACTION GRATING Ω β So thick, as the wavetrains exhibit no overlap -1 0 A``
32 CL DIFFRACTION GRATING Ω β OPD =0 No overlap, no bands -1 0 A``
33 CL DIFFRACTION GRATING Ω β Inserted in the blue side, wavetrains become even more separated, so no bands -1 0 A``
34 Sides of the beam where Talbot Broadband optical source bands appear CL A Undelayed Beam Delayed Beam DG A` Ω β SL Red Blue Π A`` Observer eye
35 OW RW When the object and reference beams overlap, the diffracted wavetrains are totally superposed R L R L 2Nλ
36 Diffraction grating For OPD = 0 Wavetrains do not superpose L R NO BANDS ARE OBSERVED N λ N λ L R TALBOT BANDS ARE OBTAINED Introducing a glass plate to intersect half of the beam to delay the Left part, brings the two diffracted waves into overlap c t> 0 N λ
37 BOS Modified Michelson interferometer to produce Talbot bands RM Screen Screen X RB OM Z OB L1 BS RW OW D D max D 0 CCD D min Diffraction grating L2 ESA N N A. Podoleanu, J. Pure and Applied Optics, 6, , (1997). A. Podoleanu, J. Pure and Applied Optics, 7, , (1998).
38 BOS Modified Michelson interferometer to produce Talbot bands RM Screen Screen X RB OM Z OB D max D CCD L1 BS RW OW D 0 D min Diffraction grating L2 ESA N N A. Podoleanu, J. Pure and Applied Optics, 6, , (1997). A. Podoleanu, J. Pure and Applied Optics, 7, , (1998).
39 Spectral interferometer sensitive to both positive and negative OPD Mirror terms or all classical FD-OCT configurations, where the two object and reference beams are superposed in their way toward the spectrometer
40 Spectral interferometer sensitive to positive OPD only No mirror terms Modified Michelson interferometer D. Woods, A. Podoleanu, Controlling the shape of Talbot bands visibility, Optics Express, 2008, Vol. 16, No
41 I sin Mβ sin β 2 0 [ ] = β= bksinθ)/2. I 1 2λ/b λμ/b 0 λ/mb 2λ/b Sinθ WIDTH OF THE DIFFRACTED PEAK The larger the number of grating lines M, the longer the diffracted wave-train length, the larger the axial range according to Talbot Bands Theory The larger M, the narrower the diffracted spot on the CCD
42 VISIBILITY OF TALBOT BAND 1 l c Optimum thickness Maximum thickness OPD Mλ 2Mλ= 2 λ= 2wavetrain length
43 APPLICATIONS TO OCT ATTENUATION TO TOTAL ELIMINATION OF MIRROR TERMS, NO CALCULATION, NO MULTIPLE STEPS REQUIRED BETTER PROFILE FOR THE SENSITIVITY DECAY WITH DEPTH, MAXIMUM MOVED TOWARDS THE MIDDLE OF THE RANGE APPLICATIONS IN SENSING RECOGNIZING WHICH PATH LENGTH IS LONGER
44 Spectrometer resolution Number of grating lines M, period b I = I sin M β sin β sin c ( α )[ ] Zeroes of the pattern: λ sinθ m = ± [1,2,...(M 1),(M + 1),(M + Mb 2),...]
45 Spectrometer resolution Number of CCD pixels A 2 ( ξ ) w ξ sin ( z ) = exp ln 2 ξ 2 ξ = π / 2).( z / z ) Z = λ /(4 λ) ( RD RD w = δλ / λ λ is the range of wavelengths seen by a single pixel δλ is resolution of the spectrometer Z.Hu, Y. Pan, & A.M.Rollins, Analytical model of spectrometer-based two-beam spectral interferometry, Appl. Opt. 46, (2007).
46 Experimental results Total attenuation of the mirror term A. Podoleanu, D. Woods, Power-efficient Fourier domain optical coherence tomography setup for selection in the optical path difference sign using Talbot bands, Opt. Lett. 32, (2007).
47 DG Spectrometer CCD PC SLD L2 DC BS MO1 TS1 Sxy L MO2 Reference Position Sample TS2
48 Lateral beam displacem ent: Channelled Spectrum Intensity (db) Novel method Old method 0m m 2.74m m m m Novel method Path difference (mm )
49 Images
50 Each diffracted wavefront has a Right (R) and a Left (L) part c t 2Nλ Nλ 0 Nλ 2Nλ Zero overlap Partial overlap Maximum overlap Partial overlap Zero overlap CLASSIC CASE OW R L R L RW RW OW R L R L OW RW R L R L OW R L RW R L R L RW OW R L Screens in place p=1 Talbot bands 2Nλ c t<0 2Nλ c t<0 2Nλ No overlap No overlap Zero overlap Maximum overlap Zero overlap L L L L L OW OW OW OW OW R R R R Nλ R RW RW RW RW RW 2Nλ c t>0 2Nλ c t>0 Screens in place p=-1 Talbot bands c t<0 c t<0 R L RW Nλ Nλ OW c t<0 Nλ R OW L c t<0 RW Nλ A. Gh. Podoleanu, Unique interpretation of Talbot Bands and Fourier domain white light interferometry Opt. Express, 2007, Vol. 15, Nλ R RW Nλ Nλ OW L Nλ R c t>0 Nλ OW RW L c t>0 Nλ c t>0 R Zero overlap Maximum overlap Zero overlap No overlap No overlap OW c t>0 RW L Nλ
51 M. Hughes, A. Podoleanu, Electronics Letters, 45, 2, (2009)
52 Electronics Letters, 45, 2, (2009)
53 REFLECTIVE SPECTROMETER TO AVOID DISPERSION BETWEEN THE TWO LATERALLY SHIFTED BEAMS Bradu A, Podoleanu A. Gh., Attenuation of mirror image and enhancement of the signal-to-noise ratio in a Talbot bands optical coherence tomography system, J. Biomed Optics, 16(7), , July 2011, to
54 One shot display of sensitivity of the FD-OCT set-up measured as a function of depth Using a tilted piece of paper
55 Further reading A. Podoleanu, S. Taplin, D. J. Webb, D. A. Jackson, J. Pure and Applied Optics, 6, , (1997). A. Podoleanu, S. Taplin, D. J. Webb, D. A. Jackson, J. Pure and Applied Optics, 7, , (1998). odoleanu, D. Woods, Opt. Lett. 32, (2007). A. Gh. Podoleanu, Opt. Express, 2007, Vol. 15, D. Woods, A. Podoleanu, Optics Express, 2008, Vol. 16, No A. Bradu, A. Podoleanu, J. Biomed Opt, 2011, 16, 7, to 10. Michelson modified interferometer using screens Theoretical model for TB of multimode lasers B scan OCT image from finger with no mirror terms Temporal short pulse description of similarity between TBs and OCT Visibility profile with depth is the correlation of power distribution profile in the two beams Demonstration of sensitivity improvement on images from tissue, with the peak of sensitivity moved inside the tissue
56 Leverhulme Trust European Research Council, Advanced fellowship to A.Podoleanu ACKNOWLEDGMENTS Engineering and Physical Sciences Research Council Biotechnology and Biological Sciences Research Council New York Eye and Ear Infirmary European Commission, Marie Curie Actions Ophthalmic Technologies Inc., Toronto Ariba New York Pfizer, Sandwich, Kent Superlum Moscow University of Kent
Gabor fusion technique in a Talbot bands optical coherence tomography system
Gabor fusion technique in a Talbot bands optical coherence tomography system Petr Bouchal, Adrian Bradu, and Adrian Gh. Podoleanu Applied Optics Group, School of Physical Sciences, University of Kent,
More informationsome aspects of Optical Coherence Tomography
some aspects of Optical Coherence Tomography SSOM Lectures, Engelberg 17.3.2009 Ch. Meier 1 / 34 Contents 1. OCT - basic principles (Time Domain Frequency Domain) 2. Performance and limiting factors 3.
More informationSimultaneous acquisition of the real and imaginary components in Fourier domain optical coherence tomography using harmonic detection
Simultaneous acquisition of the real and imaginary components in Fourier domain optical coherence tomography using harmonic detection Andrei B. Vakhtin *, Daniel J. Kane and Kristen A. Peterson Southwest
More informationS.R.Taplin, A. Gh.Podoleanu, D.J.Webb, D.A.Jackson AB STRACT. Keywords: fibre optic sensors, white light, channeled spectra, ccd, signal processing.
White-light displacement sensor incorporating signal analysis of channeled spectra S.R.Taplin, A. Gh.Podoleanu, D.J.Webb, D.A.Jackson Applied Optics Group, Physics Department, University of Kent, Canterbury,
More informationR. J. Jones College of Optical Sciences OPTI 511L Fall 2017
R. J. Jones College of Optical Sciences OPTI 511L Fall 2017 Active Modelocking of a Helium-Neon Laser The generation of short optical pulses is important for a wide variety of applications, from time-resolved
More information7 CHAPTER 7: REFRACTIVE INDEX MEASUREMENTS WITH COMMON PATH PHASE SENSITIVE FDOCT SETUP
7 CHAPTER 7: REFRACTIVE INDEX MEASUREMENTS WITH COMMON PATH PHASE SENSITIVE FDOCT SETUP Abstract: In this chapter we describe the use of a common path phase sensitive FDOCT set up. The phase measurements
More informationHeterodyne swept-source optical coherence tomography for complete complex conjugate ambiguity removal
Heterodyne swept-source optical coherence tomography for complete complex conjugate ambiguity removal Anjul Maheshwari, Michael A. Choma, Joseph A. Izatt Department of Biomedical Engineering, Duke University,
More informationImaging Systems Laboratory II. Laboratory 8: The Michelson Interferometer / Diffraction April 30 & May 02, 2002
1051-232 Imaging Systems Laboratory II Laboratory 8: The Michelson Interferometer / Diffraction April 30 & May 02, 2002 Abstract. In the last lab, you saw that coherent light from two different locations
More informationA 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 informationOptical coherence tomography
Optical coherence tomography Peter E. Andersen Optics and Plasma Research Department Risø National Laboratory E-mail peter.andersen@risoe.dk Outline Part I: Introduction to optical coherence tomography
More informationCHAPTER 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 informationWhite-light interferometry, Hilbert transform, and noise
White-light interferometry, Hilbert transform, and noise Pavel Pavlíček *a, Václav Michálek a a Institute of Physics of Academy of Science of the Czech Republic, Joint Laboratory of Optics, 17. listopadu
More informationSpatial-Phase-Shift Imaging Interferometry Using Spectrally Modulated White Light Source
Spatial-Phase-Shift Imaging Interferometry Using Spectrally Modulated White Light Source Shlomi Epshtein, 1 Alon Harris, 2 Igor Yaacobovitz, 1 Garrett Locketz, 3 Yitzhak Yitzhaky, 4 Yoel Arieli, 5* 1AdOM
More informationBasics of INTERFEROMETRY
Basics of INTERFEROMETRY P Hariharan CSIRO Division of Applied Sydney, Australia Physics ACADEMIC PRESS, INC. Harcourt Brace Jovanovich, Publishers Boston San Diego New York London Sydney Tokyo Toronto
More information3.0 Alignment Equipment and Diagnostic Tools:
3.0 Alignment Equipment and Diagnostic Tools: Alignment equipment The alignment telescope and its use The laser autostigmatic cube (LACI) interferometer A pin -- and how to find the center of curvature
More informationSingle camera spectral domain polarizationsensitive optical coherence tomography using offset B-scan modulation
Single camera spectral domain polarizationsensitive optical coherence tomography using offset B-scan modulation Chuanmao Fan 1,2 and Gang Yao 1,3 1 Department of Biological Engineering, University of Missouri,
More informationTesting Aspherics Using Two-Wavelength Holography
Reprinted from APPLIED OPTICS. Vol. 10, page 2113, September 1971 Copyright 1971 by the Optical Society of America and reprinted by permission of the copyright owner Testing Aspherics Using Two-Wavelength
More informationOCT Spectrometer Design Understanding roll-off to achieve the clearest images
OCT Spectrometer Design Understanding roll-off to achieve the clearest images Building a high-performance spectrometer for OCT imaging requires a deep understanding of the finer points of both OCT theory
More informationLecture 25 Optical Coherence Tomography
EEL6935 Advanced MEMS (Spring 2005) Instructor: Dr. Huikai Xie Lecture 25 Optical Coherence Tomography Agenda: OCT: Introduction Low-Coherence Interferometry OCT Detection Electronics References: Bouma
More informationGerhard K. Ackermann and Jurgen Eichler. Holography. A Practical Approach BICENTENNIAL. WILEY-VCH Verlag GmbH & Co. KGaA
Gerhard K. Ackermann and Jurgen Eichler Holography A Practical Approach BICENTENNIAL BICENTENNIAL WILEY-VCH Verlag GmbH & Co. KGaA Contents Preface XVII Part 1 Fundamentals of Holography 1 1 Introduction
More informationSOME ASPECTS OF CHROMATIC CONFOCAL SPECTRAL INTERFEROMETRY
XVIII IMEKO WORLD CONGRESS Metrology for a Sustainable Development September, 17 22, 2006, Rio de Janeiro, Brazil SOME ASPECTS OF CHROMATIC CONFOCAL SPECTRAL INTERFEROMETRY Klaus Körner, Evangelos Papastathopoulos,
More informationBasics of INTERFEROMETRY
Basics of INTERFEROMETRY Second Edition P. HARIHARAN School ofphysics, Sydney, Australia University of Sydney CPi AMSTERDAM BOSTON HEIDELBERG LONDON NEW YORK OXFORD PARIS SAN DIEGO SAN FRANCISCO SINGAPORE
More informationOptics and Lasers. Matt Young. Including Fibers and Optical Waveguides
Matt Young Optics and Lasers Including Fibers and Optical Waveguides Fourth Revised Edition With 188 Figures Springer-Verlag Berlin Heidelberg New York London Paris Tokyo Hong Kong Barcelona Budapest Contents
More informationTemporal coherence characteristics of a superluminescent diode system with an optical feedback mechanism
VI Temporal coherence characteristics of a superluminescent diode system with an optical feedback mechanism Fang-Wen Sheu and Pei-Ling Luo Department of Applied Physics, National Chiayi University, Chiayi
More informationDynamic Phase-Shifting Electronic Speckle Pattern Interferometer
Dynamic Phase-Shifting Electronic Speckle Pattern Interferometer Michael North Morris, James Millerd, Neal Brock, John Hayes and *Babak Saif 4D Technology Corporation, 3280 E. Hemisphere Loop Suite 146,
More informationDesign of a digital holographic interferometer for the. ZaP Flow Z-Pinch
Design of a digital holographic interferometer for the M. P. Ross, U. Shumlak, R. P. Golingo, B. A. Nelson, S. D. Knecht, M. C. Hughes, R. J. Oberto University of Washington, Seattle, USA Abstract The
More informationUse of Computer Generated Holograms for Testing Aspheric Optics
Use of Computer Generated Holograms for Testing Aspheric Optics James H. Burge and James C. Wyant Optical Sciences Center, University of Arizona, Tucson, AZ 85721 http://www.optics.arizona.edu/jcwyant,
More informationJ. C. Wyant Fall, 2012 Optics Optical Testing and Testing Instrumentation
J. C. Wyant Fall, 2012 Optics 513 - Optical Testing and Testing Instrumentation Introduction 1. Measurement of Paraxial Properties of Optical Systems 1.1 Thin Lenses 1.1.1 Measurements Based on Image Equation
More informationPhotonics 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 informationParallel Digital Holography Three-Dimensional Image Measurement Technique for Moving Cells
F e a t u r e A r t i c l e Feature Article Parallel Digital Holography Three-Dimensional Image Measurement Technique for Moving Cells Yasuhiro Awatsuji The author invented and developed a technique capable
More informationHigh-speed spectral-domain optical coherence tomography at 1.3 µm wavelength
High-speed spectral-domain optical coherence tomography at 1.3 µm wavelength S. H. Yun, G. J. Tearney, B. E. Bouma, B. H. Park, and J. F. de Boer Harvard Medical School and Wellman Center of Photomedicine,
More information(51) Int Cl.: G01B 9/02 ( ) G01B 11/24 ( ) G01N 21/47 ( )
(19) (12) EUROPEAN PATENT APPLICATION (11) EP 1 939 581 A1 (43) Date of publication: 02.07.2008 Bulletin 2008/27 (21) Application number: 07405346.3 (51) Int Cl.: G01B 9/02 (2006.01) G01B 11/24 (2006.01)
More informationIsolator-Free 840-nm Broadband SLEDs for High-Resolution OCT
Isolator-Free 840-nm Broadband SLEDs for High-Resolution OCT M. Duelk *, V. Laino, P. Navaretti, R. Rezzonico, C. Armistead, C. Vélez EXALOS AG, Wagistrasse 21, CH-8952 Schlieren, Switzerland ABSTRACT
More informationOutline. Motivation Experimental Set-Up Theory behind the set-up Results Acknowledgements
Outline Motivation Experimental Set-Up Theory behind the set-up Results Acknowledgements Motivation Attosecond pulses could be used to study time-dependence of atomic dynamics. Greater control of pulse
More informationHigh stability multiplexed fibre interferometer and its application on absolute displacement measurement and on-line surface metrology
High stability multiplexed fibre interferometer and its application on absolute displacement measurement and on-line surface metrology Dejiao Lin, Xiangqian Jiang and Fang Xie Centre for Precision Technologies,
More informationSpectral domain optical coherence tomography with balanced detection using single line-scan camera and optical delay line
Spectral domain optical coherence tomography with balanced detection using single line-scan camera and optical delay line Min Gyu Hyeon, 1 Hyung-Jin Kim, 2 Beop-Min Kim, 1,2,4 and Tae Joong Eom 3,5 1 Department
More informationCharacteristics of point-focus Simultaneous Spatial and temporal Focusing (SSTF) as a two-photon excited fluorescence microscopy
Characteristics of point-focus Simultaneous Spatial and temporal Focusing (SSTF) as a two-photon excited fluorescence microscopy Qiyuan Song (M2) and Aoi Nakamura (B4) Abstracts: We theoretically and experimentally
More informationBragg and fiber gratings. Mikko Saarinen
Bragg and fiber gratings Mikko Saarinen 27.10.2009 Bragg grating - Bragg gratings are periodic perturbations in the propagating medium, usually periodic variation of the refractive index - like diffraction
More informationOptical Communications and Networking 朱祖勍. Sept. 25, 2017
Optical Communications and Networking Sept. 25, 2017 Lecture 4: Signal Propagation in Fiber 1 Nonlinear Effects The assumption of linearity may not always be valid. Nonlinear effects are all related to
More informationCollimation Tester Instructions
Description Use shear-plate collimation testers to examine and adjust the collimation of laser light, or to measure the wavefront curvature and divergence/convergence magnitude of large-radius optical
More informationSinusoidal wavelength-scanning interferometer using an acousto-optic tunable filter for measurement of thickness and surface profile of a thin film
Sinusoidal wavelength-scanning interferometer using an acousto-optic tunable filter for measurement of thickness and surface profile of a thin film Hisashi Akiyama 1, Osami Sasaki 2, and Takamasa Suzuki
More informationGRENOUILLE.
GRENOUILLE Measuring ultrashort laser pulses the shortest events ever created has always been a challenge. For many years, it was possible to create ultrashort pulses, but not to measure them. Techniques
More informationMetrology and Sensing
Metrology and Sensing Lecture 10: Holography 2017-12-21 Herbert Gross Winter term 2017 www.iap.uni-jena.de 2 Preliminary Schedule No Date Subject Detailed Content 1 19.10. Introduction Introduction, optical
More informationOptical Coherence: Recreation of the Experiment of Thompson and Wolf
Optical Coherence: Recreation of the Experiment of Thompson and Wolf David Collins Senior project Department of Physics, California Polytechnic State University San Luis Obispo June 2010 Abstract The purpose
More informationInstructions for the Experiment
Instructions for the Experiment Excitonic States in Atomically Thin Semiconductors 1. Introduction Alongside with electrical measurements, optical measurements are an indispensable tool for the study of
More informationOff-axis full-field swept-source optical coherence tomography using holographic refocusing
Off-axis full-field swept-source optical coherence tomography using holographic refocusing Dierck Hillmann *,a, Gesa Franke b,c, Laura Hinkel b, Tim Bonin b, Peter Koch a, Gereon Hüttmann b,c a Thorlabs
More informationinstruments Solar Physics course lecture 3 May 4, 2010 Frans Snik BBL 415 (710)
Solar Physics course lecture 3 May 4, 2010 Frans Snik BBL 415 (710) f.snik@astro.uu.nl www.astro.uu.nl/~snik info from photons spatial (x,y) temporal (t) spectral (λ) polarization ( ) usually photon starved
More informationThe Measurement of Ultrashort Laser Pulses
The Measurement of Ultrashort Laser Pulses To spectrometer SHG crystal Fresnel biprism beamsplitter Cylindrical lens Etalon Oppositely tilted pulses Lens Prof. Rick Trebino Input pulse Georgia Tech & Swamp
More information14. Measuring Ultrashort Laser Pulses I: Autocorrelation
14. Measuring Ultrashort Laser Pulses I: Autocorrelation The dilemma The goal: measuring the intensity and phase vs. time (or frequency) Why? The Spectrometer and Michelson Interferometer Autocorrelation
More informationFigure1. To construct a light pulse, the electric component of the plane wave should be multiplied with a bell shaped function.
Introduction The Electric field of a monochromatic plane wave is given by is the angular frequency of the plane wave. The plot of this function is given by a cosine function as shown in the following graph.
More informationOptical Signal Processing
Optical Signal Processing ANTHONY VANDERLUGT North Carolina State University Raleigh, North Carolina A Wiley-Interscience Publication John Wiley & Sons, Inc. New York / Chichester / Brisbane / Toronto
More informationObservational Astronomy
Observational Astronomy Instruments The telescope- instruments combination forms a tightly coupled system: Telescope = collecting photons and forming an image Instruments = registering and analyzing the
More informationLOS 1 LASER OPTICS SET
LOS 1 LASER OPTICS SET Contents 1 Introduction 3 2 Light interference 5 2.1 Light interference on a thin glass plate 6 2.2 Michelson s interferometer 7 3 Light diffraction 13 3.1 Light diffraction on a
More informationTheory and Applications of Frequency Domain Laser Ultrasonics
1st International Symposium on Laser Ultrasonics: Science, Technology and Applications July 16-18 2008, Montreal, Canada Theory and Applications of Frequency Domain Laser Ultrasonics Todd W. MURRAY 1,
More informationvisibility values: 1) V1=0.5 2) V2=0.9 3) V3=0.99 b) In the three cases considered, what are the values of FSR (Free Spectral Range) and
EXERCISES OF OPTICAL MEASUREMENTS BY ENRICO RANDONE AND CESARE SVELTO EXERCISE 1 A CW laser radiation (λ=2.1 µm) is delivered to a Fabry-Pérot interferometer made of 2 identical plane and parallel mirrors
More information60 MHz A-line rate ultra-high speed Fourier-domain optical coherence tomography
60 MHz Aline rate ultrahigh speed Fourierdomain optical coherence tomography K. Ohbayashi a,b), D. Choi b), H. HiroOka b), H. Furukawa b), R. Yoshimura b), M. Nakanishi c), and K. Shimizu c) a Graduate
More informationCharacterization of a fibre optic swept laser source at 1!m for optical coherence tomography imaging systems
Proc. SPIE vol.7889, Conf. on Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XIV, Photonics West 2011 (San Francisco, USA, Jan. 22-27, 2011), paper 7889-100 Characterization
More informationLab Report 3: Speckle Interferometry LIN PEI-YING, BAIG JOVERIA
Lab Report 3: Speckle Interferometry LIN PEI-YING, BAIG JOVERIA Abstract: Speckle interferometry (SI) has become a complete technique over the past couple of years and is widely used in many branches of
More informationDispersion and Ultrashort Pulses II
Dispersion and Ultrashort Pulses II Generating negative groupdelay dispersion angular dispersion Pulse compression Prisms Gratings Chirped mirrors Chirped vs. transform-limited A transform-limited pulse:
More informationCharacterization of Chirped volume bragg grating (CVBG)
Characterization of Chirped volume bragg grating (CVBG) Sobhy Kholaif September 7, 017 1 Laser pulses Ultrashort laser pulses have extremely short pulse duration. When the pulse duration is less than picoseconds
More informationExperimental Physics. Experiment C & D: Pulsed Laser & Dye Laser. Course: FY12. Project: The Pulsed Laser. Done by: Wael Al-Assadi & Irvin Mangwiza
Experiment C & D: Course: FY1 The Pulsed Laser Done by: Wael Al-Assadi Mangwiza 8/1/ Wael Al Assadi Mangwiza Experiment C & D : Introduction: Course: FY1 Rev. 35. Page: of 16 1// In this experiment we
More informationContouring aspheric surfaces using two-wavelength phase-shifting interferometry
OPTICA ACTA, 1985, VOL. 32, NO. 12, 1455-1464 Contouring aspheric surfaces using two-wavelength phase-shifting interferometry KATHERINE CREATH, YEOU-YEN CHENG and JAMES C. WYANT University of Arizona,
More informationFar field intensity distributions of an OMEGA laser beam were measured with
Experimental Investigation of the Far Field on OMEGA with an Annular Apertured Near Field Uyen Tran Advisor: Sean P. Regan Laboratory for Laser Energetics Summer High School Research Program 200 1 Abstract
More informationWIDE SPECTRAL RANGE IMAGING INTERFEROMETER
WIDE SPECTRAL RANGE IMAGING INTERFEROMETER Alessandro Barducci, Donatella Guzzi, Cinzia Lastri, Paolo Marcoionni, Vanni Nardino, Ivan Pippi CNR IFAC Sesto Fiorentino, ITALY ICSO 2012 Ajaccio 8-12/10/2012
More informationSection 2 ADVANCED TECHNOLOGY DEVELOPMENTS
Section 2 ADVANCED TECHNOLOGY DEVELOPMENTS 2.A High-Power Laser Interferometry Central to the uniformity issue is the need to determine the factors that control the target-plane intensity distribution
More informationTwo-step-only phase-shifting interferometry with optimized detector bandwidth for microscopy of live cells
Two-step-only phase-shifting interferometry with optimized detector bandwidth for microscopy of live cells Natan T. Shaked*, Yizheng Zhu, Matthew T. Rinehart, and Adam Wax Department of Biomedical Engineering,
More informationInfrared broadband 50%-50% beam splitters for s- polarized light
University of New Orleans ScholarWorks@UNO Electrical Engineering Faculty Publications Department of Electrical Engineering 7-1-2006 Infrared broadband 50%-50% beam splitters for s- polarized light R.
More informationDynamic beam shaping with programmable diffractive optics
Dynamic beam shaping with programmable diffractive optics Bosanta R. Boruah Dept. of Physics, GU Page 1 Outline of the talk Introduction Holography Programmable diffractive optics Laser scanning confocal
More informationPhase Modulation Characteristics of Spatial Light Modulator and the System for Its Calibration
Journal of Electrical Engineering 6 (2018) 193-205 doi: 10.17265/2328-2223/2018.04.001 D DAVID PUBLISHING Phase Modulation Characteristics of Spatial Light Modulator and the System for Its Calibration
More informationPhoton Diagnostics. FLASH User Workshop 08.
Photon Diagnostics FLASH User Workshop 08 Kai.Tiedtke@desy.de Outline What kind of diagnostic tools do user need to make efficient use of FLASH? intensity (New GMD) beam position intensity profile on the
More informationSuppression of FM-to-AM conversion in third-harmonic. generation at the retracing point of a crystal
Suppression of FM-to-AM conversion in third-harmonic generation at the retracing point of a crystal Yisheng Yang, 1,,* Bin Feng, Wei Han, Wanguo Zheng, Fuquan Li, and Jichun Tan 1 1 College of Science,
More informationOptical Design for OCT
12 Optical Design for OCT Z. Hu and A.M. Rollins This chapter aims to provide insights and tools to design high-quality optical subsystems for OCT. First, we discuss the various optical subsystems common
More informationSwept Wavelength Testing:
Application Note 13 Swept Wavelength Testing: Characterizing the Tuning Linearity of Tunable Laser Sources In a swept-wavelength measurement system, the wavelength of a tunable laser source (TLS) is swept
More informationSupplementary Materials
Supplementary Materials In the supplementary materials of this paper we discuss some practical consideration for alignment of optical components to help unexperienced users to achieve a high performance
More informationExperiment 1: Fraunhofer Diffraction of Light by a Single Slit
Experiment 1: Fraunhofer Diffraction of Light by a Single Slit Purpose 1. To understand the theory of Fraunhofer diffraction of light at a single slit and at a circular aperture; 2. To learn how to measure
More informationUsing Stock Optics. ECE 5616 Curtis
Using Stock Optics What shape to use X & Y parameters Please use achromatics Please use camera lens Please use 4F imaging systems Others things Data link Stock Optics Some comments Advantages Time and
More informationSilicon photonic devices based on binary blazed gratings
Silicon photonic devices based on binary blazed gratings Zhiping Zhou Li Yu Optical Engineering 52(9), 091708 (September 2013) Silicon photonic devices based on binary blazed gratings Zhiping Zhou Li Yu
More informationConfocal Imaging Through Scattering Media with a Volume Holographic Filter
Confocal Imaging Through Scattering Media with a Volume Holographic Filter Michal Balberg +, George Barbastathis*, Sergio Fantini % and David J. Brady University of Illinois at Urbana-Champaign, Urbana,
More informationShaping light in microscopy:
Shaping light in microscopy: Adaptive optical methods and nonconventional beam shapes for enhanced imaging Martí Duocastella planet detector detector sample sample Aberrated wavefront Beamsplitter Adaptive
More informationAgilOptics mirrors increase coupling efficiency into a 4 µm diameter fiber by 750%.
Application Note AN004: Fiber Coupling Improvement Introduction AgilOptics mirrors increase coupling efficiency into a 4 µm diameter fiber by 750%. Industrial lasers used for cutting, welding, drilling,
More informationPhysical Optics. Diffraction.
Physical Optics. Diffraction. Interference Young s interference experiment Thin films Coherence and incoherence Michelson interferometer Wave-like characteristics of light Huygens-Fresnel principle Interference.
More informationDiffractive optical elements for high gain lasers with arbitrary output beam profiles
Diffractive optical elements for high gain lasers with arbitrary output beam profiles Adam J. Caley, Martin J. Thomson 2, Jinsong Liu, Andrew J. Waddie and Mohammad R. Taghizadeh. Heriot-Watt University,
More informationVirtually Imaged Phased Array
UDC 621.3.32.26:621.391.6 Virtually Imaged Phased Array VMasataka Shirasaki (Manuscript received March 11, 1999) A Virtually Imaged Phased Array (VIPA) is a simple design of an optical element which shows
More informationPupil Planes versus Image Planes Comparison of beam combining concepts
Pupil Planes versus Image Planes Comparison of beam combining concepts John Young University of Cambridge 27 July 2006 Pupil planes versus Image planes 1 Aims of this presentation Beam combiner functions
More informationExperimental Competition
37 th International Physics Olympiad Singapore 8 17 July 2006 Experimental Competition Wed 12 July 2006 Experimental Competition Page 2 List of apparatus and materials Label Component Quantity Label Component
More informationOPTICAL COHERENCE TOMOGRAPHY: OCT supports industrial nondestructive depth analysis
OPTICAL COHERENCE TOMOGRAPHY: OCT supports industrial nondestructive depth analysis PATRICK MERKEN, RAF VANDERSMISSEN, and GUNAY YURTSEVER Abstract Optical coherence tomography (OCT) has evolved to a standard
More informationSimultaneous multiple-depths en-face optical coherence tomography using multiple signal excitation of acousto-optic deflectors
Simultaneous multiple-depths en-face optical coherence tomography using multiple signal excitation of acousto-optic deflectors Mantas Zurauskas, * John Rogers, and Adrian Gh. Podoleanu Applied Optics Group,
More informationSupplementary Figure 1. Effect of the spacer thickness on the resonance properties of the gold and silver metasurface layers.
Supplementary Figure 1. Effect of the spacer thickness on the resonance properties of the gold and silver metasurface layers. Finite-difference time-domain calculations of the optical transmittance through
More informationA 3D Profile Parallel Detecting System Based on Differential Confocal Microscopy. Y.H. Wang, X.F. Yu and Y.T. Fei
Key Engineering Materials Online: 005-10-15 ISSN: 166-9795, Vols. 95-96, pp 501-506 doi:10.408/www.scientific.net/kem.95-96.501 005 Trans Tech Publications, Switzerland A 3D Profile Parallel Detecting
More informationImproved phase sensitivity in spectral domain phase microscopy using line-field illumination and self phase-referencing
Improved phase sensitivity in spectral domain phase microscopy using line-field illumination and self phase-referencing Zahid Yaqoob, 1 Wonshik Choi, 1,2,* eungeun Oh, 1 Niyom Lue, 1 Yongkeun Park, 1 Christopher
More informationHigh Resolution Microlithography Applications of Deep-UV Excimer Lasers
Invited Paper High Resolution Microlithography Applications of Deep-UV Excimer Lasers F.K. Tittel1, M. Erdélyi2, G. Szabó2, Zs. Bor2, J. Cavallaro1, and M.C. Smayling3 1Department of Electrical and Computer
More informationSpectral Phase Modulation and chirped pulse amplification in High Gain Harmonic Generation
Spectral Phase Modulation and chirped pulse amplification in High Gain Harmonic Generation Z. Wu, H. Loos, Y. Shen, B. Sheehy, E. D. Johnson, S. Krinsky, J. B. Murphy, T. Shaftan,, X.-J. Wang, L. H. Yu,
More informationMulti-Lateral Shearing Interferometry: Principle and Application on X-ray Laboratory Sources
Multi-Lateral Shearing Interferometry: Principle and Application on X-ray Laboratory Sources International Symposium on Digital Industrial Radiology and Computed Tomography June 22-25, 2015 Adrien STOLIDI
More informationPhysics 476LW. Advanced Physics Laboratory - Microwave Optics
Physics 476LW Advanced Physics Laboratory Microwave Radiation Introduction Setup The purpose of this lab is to better understand the various ways that interference of EM radiation manifests itself. However,
More informationCitation for published version (APA): Nguyen, D. V. (2013). Integrated-optics-based optical coherence tomography
UvA-DARE (Digital Academic Repository) Integrated-optics-based optical coherence tomography Nguyen, Duc Link to publication Citation for published version (APA): Nguyen, D. V. (2013). Integrated-optics-based
More informationOptical Characterization and Defect Inspection for 3D Stacked IC Technology
Minapad 2014, May 21 22th, Grenoble; France Optical Characterization and Defect Inspection for 3D Stacked IC Technology J.Ph.Piel, G.Fresquet, S.Perrot, Y.Randle, D.Lebellego, S.Petitgrand, G.Ribette FOGALE
More informationB. Cavity-Enhanced Absorption Spectroscopy (CEAS)
B. Cavity-Enhanced Absorption Spectroscopy (CEAS) CEAS is also known as ICOS (integrated cavity output spectroscopy). Developed in 1998 (Engeln et al.; O Keefe et al.) In cavity ringdown spectroscopy,
More informationSensitive measurement of partial coherence using a pinhole array
1.3 Sensitive measurement of partial coherence using a pinhole array Paul Petruck 1, Rainer Riesenberg 1, Richard Kowarschik 2 1 Institute of Photonic Technology, Albert-Einstein-Strasse 9, 07747 Jena,
More information7. Michelson Interferometer
7. Michelson Interferometer In this lab we are going to observe the interference patterns produced by two spherical waves as well as by two plane waves. We will study the operation of a Michelson interferometer,
More informationDoppler-Free Spetroscopy of Rubidium
Doppler-Free Spetroscopy of Rubidium Pranjal Vachaspati, Sabrina Pasterski MIT Department of Physics (Dated: April 17, 2013) We present a technique for spectroscopy of rubidium that eliminates doppler
More information