Category: Tunable Sources

1. OCT Companies in the News

   (12 articles) Axsun Technologies

   (7 articles) Santec

   (6 articles) LightLab Imaging

   (4 articles) Volcano

   (4 articles) NTT Electronics

   (3 articles) Micron Optics

   (3 articles) Thorlabs

   (2 articles) Praevium Research

   (2 articles) Carl Zeiss Meditec

   (1 articles) Wavelength Electronics

2. OCT Products in the News

   (2 articles) Lightlab M3 Imaging Console

   (2 articles) Lightlab ImageWire

3. Organizations in the News

   (15 articles) Ludwig Maximilians Universität München

   (11 articles) Massachusetts Institute of Technology

   (8 articles) National Research Council Canada

   (8 articles) Harvard University

   (7 articles) Ryerson University

   (7 articles) University of Toronto

   (5 articles) Kitasato University

   (5 articles) Massachusetts General Hospital

   (4 articles) UC Irvine

   (4 articles) Technical University of Denmark

4. People in the News

   (16 articles) Robert A. Huber

   (12 articles) Dale Flanders

   (11 articles) Benjamin R. Biedermann

   (9 articles) Wolfgang Wieser

   (9 articles) James G. Fujimoto

   (8 articles) Christoph M. Eigenwillig

   (7 articles) Changho Chong

   (7 articles) Beau A. Standish

   (6 articles) Tooru Sakai

   (6 articles) Atsushi Morosawa

1. >400 kHz repetition rate wavelength-swept laser and application to high-speed optical frequency domain imaging

   Explore Article opticsinfobase.org (Aug 23 2010) Tunable Sources

   We demonstrate a high-speed wavelength-swept laser with a tuning range of 104nm (1228–1332nm) and a repetition rate of 403kHz. The design of the laser utilizes a high-finesse polygon-based wavelength-scanning filter and a short-length unidirectional ring resonator. Optical frequency domain imaging of the human skin in vivo is presented using this laser, and the system shows sensitivity of higher than 98dB with single-side ranging depth of 1.7mm over 4dB sensitivity roll-off.
   

   Comment on Article Mentions:   Wang Yuhl Oh   Benjamin J. Vakoc   Milen Shishkov

2. Fourier domain mode-locked swept source
at 1050 nm based on a tapered amplifier

   Explore Article opticsinfobase.org (Jul 12 2010) Tunable Sources

   While swept source optical coherence tomography (OCT) in the 1050 nm range is promising for retinal imaging, there are certain challenges. Conventional semiconductor gain media have limited output power, and the performance of high-speed Fourier domain mode-locked (FDML) lasers suffers from chromatic dispersion in standard optical fiber. We developed a novel light source with a tapered amplifier as gain medium, and investigated the FDML performance comparing two fiber delay lines with different dispersion properties. We introduced an additional gain element into the resonator, and thereby achieved stable FDML operation, exploiting the full bandwidth of the tapered amplifier despite high dispersion. ...
   

   Comment on Article Mentions:   Peter E. Andersen   Wolfgang Wieser   Thomas Klein

3. Multi-Megahertz OCT: High quality 3D imaging at 20 million A-scans and 4.5 GVoxels per second

   Explore Article opticsinfobase.org (Jun 23 2010) Tunable Sources

   We present ultra high speed optical coherence tomography (OCT) with multi-megahertz line rates and investigate the achievable image quality. The presented system is a swept source OCT setup using a Fourier domain mode locked (FDML) laser. Three different FDML-based swept laser sources with sweep rates of 1, 2.6 and 5.2MHz are compared. Imaging with 4 spots in parallel quadruples the effective speed, enabling depth scan rates as high as 20.8 million lines per second. Each setup provides at least 98dB sensitivity and ~10µm resolution in tissue. High quality 2D and 3D imaging of biological samples is demonstrated at full scan ...
   

   Comment on Article Mentions:   Wolfgang Wieser   Thomas Klein   Benjamin R. Biedermann

4. Full-range polarization-sensitive swept-source optical coherence tomography by simultaneous transversal and spectral modulation

   Explore Article opticsinfobase.org (Jun 15 2010) Ophthalmology , Tunable Sources

   Polarization-sensitive swept-source optical coherence tomography (PS-SS-OCT) is used to measure three-dimensional phase-retardation images of birefringent biological tissue in vivo. PS-SS-OCT with continuous source polarization modulation is used to multiplex the incident states of polarization in the signal frequency of each A-scan. Although it offers the advantage of measurement speed that is as high as that of standard SS-OCT, its disadvantage is low axial measurement range. To overcome this drawback, we employed the B-M-mode scan (BM-scan) method, which removes complex conjugate ambiguity by applying phase modulation along the transversal scanning direction. Since polarization modulation and BM-scan are applied in different scanning ...
   

   Comment on Article Mentions:   Shuichi Makita   Yoshiaki Yasuno   Masahiro Yamanari

5. 140 kHz Optical Coherence Tomography by 2 Degree Of Freedom MEMS Scanner Based Swept Source

   Explore Article Optical Coherence Tomography News (May 23 2010) Tunable Sources

   Feature Of The Week 5/23/10: Swept source detection optical coherence tomography (OCT) is becoming ever more popular as a chosen approach for clinical applications. This has to do with many factors including speed, compactness, costs, signal processing advantages, and center wavelength capability. Swept source technology continues to improve at a major rate but still achieving a high-speed sweep and long coherence length is one of the most demanding requirements for the swept source. Sweep rates beyond 100 kHz are routinely needed for faster acquisition in a time-limited medical procedure, faster 3D/4D capturing, or motion artifact-free imaging, such as for cardiology, ...
   

   Comment on Article Mentions:   Santec   University of Tokyo   Changho Chong

6. Experimental validation of an optimized signal processing method to handle non-linearity in swept-source optical coherence tomography

   Explore Article opticsinfobase.org (May 5 2010) Tunable Sources

   We evaluate various signal processing methods to handle the non-linearity in wavenumber space exhibited by most laser sources for swept-source optical coherence tomography. The following methods are compared for the same set of experimental data: non-uniform discrete Fourier transforms with Vandermonde matrix or with Lomb periodogram, resampling with linear interpolation or spline interpolation prior to fast-Fourier transform (FFT), and resampling with convolution prior to FFT. By selecting an optimized Kaiser-Bessel window to perform the convolution, we show that convolution followed by FFT is the most efficient method. It allows small fractional oversampling factor between 1 and 2, thus a minimal ...
   

   Comment on Article Mentions:   Guy Lamouche   Sebastien Vergnole   National Research Council Canada

7. Swept source type optical coherent tomography system

   Explore Article uspto.gov (Apr 20 2010) Patents , Tunable Sources

   A surface emission laser light source is used as a tunable laser light source. Since the surface emission laser light source can realize a broad frequency scanning range at a high speed and in the single mode, a coherent length is longer than that of a multi mode light source. For this reason, when a tomography image is calculated by executing the Fourier transform for an output obtained from an interference optical device, measuring depth can be deepened.
   

   Comment on Article Mentions:   Santec   Changho Chong

8. Deshpande Center Grant Recipients & Spinouts: Terahertz Swept Source Optical Coherence Tomography

   Explore Article web.mit.edu (Apr 11 2010) Funding , Tunable Sources

   Qing Hu a Professor of Electrical Engineering, Department of Electrical Engineering and Computer Science at MIT and Alan Lee a Visiting Research Scientist at MIT received an ignition grant from the MIT Deshpande Center for work on a "Terahertz Swept Source Optical Coherence Tomography"
   

   Comment on Article

9. Multiple source frequency-modulated continuous-wave optical reflectometry: theory and experiment

   Explore Article opticsinfobase.org (Mar 30 2010) Tunable Sources

   We propose and demonstrate a novel approach to increase the effective bandwidth of a frequency-modulated continuous-wave (FMCW) ranging system. This is achieved by algorithmically stitching together the swept spectra of separate laser sources. The result is an improvement in the range resolution proportional to the increase in the swept-frequency range. An analysis of this system as well as the outline of the stitching algorithm are presented. Using three distinct swept-frequency optical waveforms, we experimentally demonstrate a threefold improvement in the range resolution of a three-sweep approach over the conventional FMCW method.
   

   Comment on Article Mentions:   California Institute of Technology

10. Ultrahigh-speed volumetric ophthalmic OCT imaging at 800nm and 1050nm

    Explore Article SPIE Digital Library (Mar 2 2010) Ophthalmology , Tunable Sources

    The performance and imaging characteristics of ultrahigh speed ophthalmic optical coherence tomography (OCT) are investigated. In vivo imaging results are obtained at 850nm and 1050nm using different configurations of spectral and swept source / Fourier domain OCT. A spectral / Fourier domain instrument using a high speed CMOS linescan camera with SLD light source centered at 850nm achieves speeds of ~91,000 axial scans per second with ~3µm axial resolution in tissue. A spectral / Fourier domain instrument using an InGaAs linescan camera with SLD light source centered at 1050nm achieves ~47,000 axial scans per second with ~7µm resolution in tissue. ...
    

    Comment on Article Mentions:   Massachusetts Institute of Technology   Thorlabs   Iwona Gorczyńska

11. Simultaneous 6-channel optical coherence tomography using a high-power telescope-less polygon-based swept laser in dual amplifier configuration

    Explore Article SPIE Digital Library (Feb 28 2010) Tunable Sources

    Multichannel optical coherence tomography (MOCT) imaging is demonstrated using a high-power wavelength-swept laser source. The main benefit of MOCT is faster image acquisition rates without a corresponding increase in the laser tuning speed. The wavelength-swept laser was constructed using a compact telescope-less polygon-based filter in Littman arrangement. High output power, necessary for MOCT, was achieved by incorporating two serial semiconductor optical amplifiers in a ring laser cavity in Fourier domain mode-locked configuration. The laser has a measured wavelength tuning range of 111 nm centered at 1329 nm, coherence length of 5.5 mm, and total average output power of 131 mW ...
    

    Comment on Article Mentions:   Ontario Cancer Institute   University of Toronto   Victor X. D. Yang

12. Multichannel optical coherence tomography using a high-power telescope-less polygon-based swept laser in dual-amplifier configuration

    Explore Article Optical Coherence Tomography News (Feb 28 2010) Tunable Sources

    Feature Of The Week 2/28/10: searchers at the University of Toronto, Ontario Cancer Institute and Ryerson University have been actively advancing Optical Coherence Tomography (OCT) in several areas, including application of Doppler OCT (DOCT) and advancing the underlying technology to expand and improve the applications and capability of this imaging modality. The group, led by Dr. Alex Vitkin and Dr. Victor Yang, has clinical experience in circulation imaging of the gastrointestinal tracts, the prostate, the colons, the lungs, and more. This group also developed a microvasculature imaging technique called speckle variance OCT (SV-OCT) that can capture, with high sensitivity, the ...
    

    Comment on Article Mentions:   Ontario Cancer Institute   University of Toronto   I. Alex Vitkin

13. Compact ultrafast reflective Fabry-Perot tunable lasers for OCT imaging applications

    Explore Article SPIE Digital Library (Feb 22 2010) Tunable Sources

    We demonstrate a novel reflective Fabry-Perot tunable laser (RFPTL) for high speed swept-source optical coherence tomography (OCT) imaging applications. This external cavity semiconductor laser uses a silicon MEMS tunable Fabry- Perot filter in a novel reflective mode of operation. The laser is packaged in a compact 25x15 mm fiber-pigtailed butterfly package. Lasers at 1060 and 1300 nm wavelengths have been demonstrated with tuning ranges up to 140 nm, fast scan rates of 100 kHz, and coherence lengths greater than 13 mm. We also describe OCT imaging with these lasers. RFPTL lasers with 1-2 µm wavelengths and tuning ranges of 250 ...
    

    Comment on Article Mentions:   Axsun Technologies   Dale Flanders

14. FDML swept source at 1060 nm using a tapered amplifier

    Explore Article SPIE Digital Library (Feb 19 2010) Tunable Sources

    We present a novel frequency-swept light source working at 1060nm that utilizes a tapered amplifier as gain medium. These devices feature significantly higher saturation power than conventional semiconductor optical amplifiers and can thus improve the limited output power of swept sources in this wavelength range. We demonstrate that a tapered amplifier can be integrated into a fiber-based swept source and allows for high-speed FDML operation. The developed light source operates at a sweep rate of 116kHz with an effective average output power in excess of 30mW. With a total sweep range of 70 nm an axial resolution of 15 µm ...
    

    Comment on Article Mentions:   Micron Optics   Wolfgang Wieser   Thomas Klein

15. MEMS scanner based swept source laser for optical coherence tomography

    Explore Article SPIE Digital Library (Feb 19 2010) Tunable Sources

    We developed a swept source laser using a micro electro mechanical systems (MEMS) scanner mirror, and demonstrated optical coherence tomography. To enable both the wide tuning wavelength range and high scanning frequency, we introduced 2-degree-of-freedom(2-DOF) MEMS scanner mirror. A tunable optical filter is composed of a MEMS scanner mirror and a diffraction grating which is arranged in Littrow configuration. We built a swept source laser which has a wavelength range of 143 nm, center wavelength of 1304 nm, and a peak power of 16 mW. OCT measurements are performed at a rate of 17.9 kHz and doubled 35.9 kHz at ...
    

    Comment on Article Mentions:   Santec   Changho Chong   Atsushi Morosawa

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