Tunable Sources -Optical Coherence Tomography News

Articles in category: Tunable Sources

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1. High-speed ultra-broad tuning MEMS-VCSELs for imaging and spectroscopy
  
  Explore Conference Proceedings May 21 2013 Tunable Sources
  
  In the last 2 years, the field of micro-electro-mechanical systems tunable vertical cavity surface-emitting lasers (MEMS-VCSELs) has seen dramatic improvements in laser tuning range and tuning speed, along with expansion into unexplored wavelength bands, enabling new applications. This paper describes the design and performance of high-speed ultra-broad tuning range 1050nm and 1310nm MEMS-VCSELs for medical imaging and spectroscopy. Key results include achievement of the first MEMS-VCSELs at 1050nm and 1310nm, with 100nm tuning demonstrated at 1050nm and 150nm tuning at shown at 1310nm. The latter result represents the widest tuning range of any MEMS-VCSEL at any wavelength. Wide tuning range ...
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  Mentions: University of Wisconsin Massachusetts Institute of Technology James G. Fujimoto
2. Picosecond pulses from wavelength-swept continuous-wave Fourier domain mode-locked lasers
  
  Explore Nature Publishing Group May 16 2013 Tunable Sources
  
  Ultrafast lasers have a crucial function in many fields of science; however, up to now, high-energy pulses directly from compact, efficient and low-power semiconductor lasers are not available. Therefore, we introduce a new approach based on temporal compression of the continuous-wave, wavelength-swept output of Fourier domain mode-locked lasers, where a narrowband optical filter is tuned synchronously to the round-trip time of light in a kilometre-long laser cavity. So far, these rapidly swept lasers enabled orders-of-magnitude speed increase in optical coherence tomography. Here we report on the generation of ~60-70 ps pulses at 390 kHz repetition rate. As energy is stored ...
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  Mentions: Robert A. Huber Wolfgang Wieser Thomas Klein
3. Swept source OCT apparatus
  
  Explore uspto.gov May 14 2013 Patents , Tunable Sources
  
  A method of performing spectral OCT imaging on a target involves repeatedly scanning said target along a transverse scanning line with an object beam derived from an OCT interferometer having a narrowband source. The wavelength of the narrowband source is modulated over a range of wavelengths at a rate that is slow relative to the rate of scanning the target. The object beam returned from the target is detected to produce a set of data obtained from multiple scans along said scanning line over the entire range of wavelengths. The data is then processed to extract an OCT image (typically ...
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  Mentions: John A. Rogers Optos
4. Visual perception enhancement for detection of cancerous oral tissue by multi-spectral imaging
  
  Explore IOPscience Mar 7 2013 Oncology , Tunable Sources
  
  Color reproduction systems based on the multi-spectral imaging technique (MSI) for both directly estimating reflection spectra and direct visualization of oral tissues using various light sources are proposed. Images from three oral cancer patients were taken as the experimental samples, and spectral differences between pre-cancerous and normal oral mucosal tissues were calculated at three time points during 5-aminolevulinic acid photodynamic therapy (ALA-PDT) to analyze whether they were consistent with disease processes. To check the successful treatment of oral cancer with ALA-PDT, oral cavity images by swept source optical coherence tomography (SS-OCT) are demonstrated. This system can also reproduce images under ...
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  Mentions: National Taiwan University Meng-Tsan Tsai Chang Gung University
5. System and method for correcting sampling errors associated with radiation source tuning rate fluctuations in swept-wavelength interferometry
  
  Explore uspto.gov Mar 5 2013 Patents , Tunable Sources
  
  The frequency-sampling method is widely used to accommodate nonlinear electromagnetic source tuning in swept-wavelength interferometric techniques, such as optical frequency domain reflectometry (OFDR) and swept-wavelength optical coherence tomography (OCT). Two sources of sampling errors are associated with the frequency-sampling method. One source of error is the limit of an underlying approximation for long interferometer path mismatches and fast electromagnetic source tuning rates. A second source of error is transmission delays in data acquisition hardware. Aspects of the invention relate to a method and system for correcting sampling errors in swept-wavelength interferometry systems such that the two error sources correct sampling ...
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  Mentions: University of Colorado
6. Algorithm for Excitation Optimization of Fabry-Perot Filters Used in Swept Sources
  
  Explore IEEE Xplore Feb 19 2013 Tunable Sources
  
  We investigate the improvement in the nonlinearity of a conventional wavelength swept laser source on the basis of a fiber Fabry–Pérot tunable filter using a well-established optimization method, simulated annealing (SA). The signal driving the filter is constructed from many short ramps of different slopes that are interconnected. The values of the slopes are optimized through the SA algorithm to achieve maximum amplitude for the Fourier transformed peaks of the photodetected interferometric signal.
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  Mentions: Adrian G. Podoleanu University of Kent Multiwave Photonics
7. Hamamatsu's New Medical Light Source using NTT's Communication Laser Technology
  
  Explore hamamatsu.com Feb 19 2013 Other Business News , Tunable Sources
  
  In a joint partnership, NTT Advance Technology Corp. (hereinafter: NTT-AT; head office: Shinjuku-ku, Tokyo; President and CEO: Takashi Hanazawa) and Hamamatsu Photonics K.K. (head office: Hamamatsu-shi, Shizuoka; President and CEO: Akira Hiruma) will start selling a 1.3-μm-band wavelength swept light source for use in optical coherence tomography (OCT) on February 1. OCT is a non-invasive in vivo imaging technique that is widely used in clinical applications. NTT-AT has developed this product using the same technology employed in the manufacture of an electro-optic crystal called KTN (potassium tantalate niobate: KTa 1-x Nb x O 3 ) developed for use ...
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  Mentions: Hamamatsu Photonics NTT
8. ams Technologies 200 kHz Swept Light Source for OCT Imaging
  
  Explore Home - AMS Technologies Feb 18 2013 Other Business News , Tunable Sources
  
  High-speed lightwave sweep enabling high-speed, high-resolution imaging – New Laser Technology reduces the impact of diagnostic imaging on patients The newly developed light source uses a high-speed KTN light deflector and high-speed wavelength swept variable laser technology, both developed by NTT for used in telecommunications. This is currently the fastest light source commercially available. The wavelength used is in the 1.3 μm band, the band used for OCT-based examination of the coronary arteries. In addition to the high-speed sweep at 200 kHz, the product has the following performance features: - wavelength sweep span larger than 100 nm - average light output of ...
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  Mentions: NTT
9. Optimization of Excitation of Fiber Fabry-Perot Tunable Filters Used In Swept Sources for Optical Coherence Tomography Using Simulated Annealing Algorithm
  
  Explore IEEE Xplore Jan 22 2013 Tunable Sources
  
  We investigate the improvement in the nonlinearity of a conventional wavelength swept laser source based on a fiber Fabry-Perot tunable filter using a well established optimization method, simulated annealing (SA). The signal driving the filter is constructed from many short ramps of different slopes that are connected to each other. The values of the slopes are optimised using the SA algorithm in order to achieve maximum amplitude for the Fourier transformed peaks of the photodetected interferometric signal.
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  Mentions: Adrian G. Podoleanu Adrian Bradu Antonio Lobo
10. New Exalos Swept-Source OEM Module - Visit our SS-OCT engine demonstration at Photonics West 2013!
  
  Explore Optical Coherence Tomography News Jan 22 2013 Other Business News , Tunable Sources
  
  Exalos Press Release - EXALOS AG, in response to our valuable swept source customers requiring an industrial solution addressing small form factor, volume scalability, and cost effectiveness, announces the introduction of its new compact swept source OEM module and the demonstration of a high-performance swept source. The robust and compact swept-source OEM module integrates the miniature swept source in a 26-PIN butterfly (BTF) package with the associated drive electronics, resulting in a 3.5” HDD format perfect for broad-base field deployment of OCT imaging and sensing applications. A 1310-nm swept source operating at 40 kHz A-scan rate is realized in a ...
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  Mentions: Exalos Kevin Hsu
11. New EXALOS Swept-Source OCT Engine Enables Real-Time Imaging at 100kHz A-scan Rate
  
  Explore Optical Coherence Tomography News Jan 22 2013 Other Business News , Tunable Sources
  
  Exaplos Press Release - EXALOS AG, responding to the need for a turn-key solution to enable efficient development and rapid market entry into OCT imaging for its customer base, announces the introduction of its new EOE380000 series of swept source OCT engine. The EXALOS swept-source OCT engine (EOE) is an integral system containing a swept source module, an FPGA-based data acquisition card in a commercial PC, and proprietary software that enables real-time OCT signal acquisition, processing, and k-space remapping at an A-scan rate as high as 100 kHz. Specifically, the OCT engine integrates an OEM swept source (in 3.5” HDD ...
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  Mentions: Exalos Kevin Hsu
12. Wavelength-tunable light source
  
  Explore uspto.gov Jan 22 2013 Patents , Tunable Sources
  
  In at least one embodiment of the wavelength-tunable light source, it comprises an output source, which is capable in operation of generating electromagnetic radiation. Furthermore, the light source has a wavelength-selective first filter element, which is situated downstream from the output source. Moreover, the light source contains a first amplifier medium, which is situated downstream from the first filter element and is capable of at least partial amplification of the radiation emitted by the output source. The light source further comprises at least one wavelength-selective second filter element, which is situated downstream from the first amplifier medium, the second filter ...
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  Mentions: Robert A. Huber Benjamin R. Biedermann Christoph M. Eigenwillig
13. System And Method For Improved Resolution, Higher Scan Speeds And Reduced Processing Time In Scans Involving SWEPT-WAVELENGTH Interferometry
  
  Explore patentscope.wipo.int Jan 1 2013 Patents , Tunable Sources
  
  A system and method for measuring an interferometric signal from a swept-wavelength interferometer by scanning a tunable laser source (12) over two wavelength ranges, whose centers are separated substantially more than the length of wavelength ranges. The spatial resolution of the measurement is determined by the inverse of the wavelength separation between a first and second wavelength region, as well as by the wavelength range of the first and second regions. An electronically tunable laser may be utilized to produce two wavelength ranges that are widely separated in wavelength. Such a system and method has wide applications to the fields ...
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  Mentions: Michael P. Minneman Insight Photonic Solutions
14. Volcano Corporation Enters $11M Supply Agreement with Santec for Swept Source Lasers
  
  Explore Optical Coherence Tomography News Dec 26 2012 Cardiology , Other Business News , Partnership , Tunable Sources
  
  Volcano Corporation recent Form 8K filing indicates that it has entered an $11.3M supply agreement with Santec Corporation to supply tunable lasers for its intravascular swept source optical coherence tomography (SS-OCT) product. The text at the bottom of this article shows a page from Volcano’s recent 8k filing (see Link ). Volcano has been through a long and tortuous path to get a swept source laser for its OCT product since it announced the acquisition of Axsun Technology in December 2008. One of the reasons that Volcano acquired Axsun was Volcano thought that Axsun had swept source laser technology ...
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  Mentions: Axsun Technologies Santec Volcano Corporation
15. Fourier domain mode locking: method and apparatus for control and improved performance
  
  Explore uspto.gov Nov 20 2012 Patents , Tunable Sources
  
  A control system for improving and stabilizing Fourier domain mode locking (FDML) operation. The control system may also provide regulation of FDML operational parameters such as filter tuning, laser gain, polarization, polarization chromaticity, elliptical polarization retardance, and/or dispersion. The control system may be located internal to or external from the FDML laser cavity.
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  Mentions: Desmond C. Adler Massachusetts Institute of Technology James G. Fujimoto
16. Integrated-optics-based swept-source optical coherence tomography
  
  Explore opticsinfobase.org Nov 15 2012 Tunable Sources
  
  We designed, fabricated, and characterized an integrated-optics-based swept-source optical coherence tomography (SS-OCT) system in TriPleX technology. An external 1300 nm swept source is coupled to the chip, which contains waveguide structures for interferometric depth ranging and balanced detection. The complete OCT chip has a footprint of 0.4 cm × 1.8 cm . Light from the chip is focused onto the s.ample using an aspheric lens; the lateral resolution is 21 ± 1 μ m . OCT measurements, performed with a moveable mirror, demonstrate a sensitivity of − 80 dB and imaging up to the maximum depth of 5.09 mm. Corrected for dispersion ...
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  Mentions: Academic Medical Center at the University of Amsterdam Jeroen Kalkman Ton G. van Leeuwen
17. Intrasweep phase-sensitive optical coherence tomography for noncontact optical photoacoustic imaging
  
  Explore opticsinfobase.org Oct 16 2012 Tunable Sources
  
  We introduce a method to extract the photoacoustic (PA) signal from the phase time evolution of an optical coherence tomography (OCT) swept source spectral sweep. This all-optical detection is achieved in a noncontact fashion directly on the sample surface by using its specular reflection. High-speed measurement and referencing allow for close to shot noise limited phase-sensitive detection. It offers a simple way to perform OCT and PA imaging by sharing the same system components.
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  Mentions: Rainer A. Leitgeb Medical University of Vienna Robert A. Huber
18. Praevium Research Receives NIH Grant to Develop VCSEL Technology for Ultra-High Speed OCT Retinal and Anterior Eye Imaging.
  
  Explore Optical Coherence Tomography News Oct 9 2012 Funding , Tunable Sources
  
  Praevium Research Receives a 2012 NIH Grant for $141,433 to Develop VCSEL Technology for UltraHigh Speed OCT Retinal and Anterior Eye Imaging. The principal investigator is Vijay Jayarman. The progam begins in 2012 and ends in 2015.
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  Mentions: National Institutes of Health Praevium Research Vijay Jayaraman
19. Highly functional wideband fiber lasers for metrology
  
  Explore Home: SPIE.org Oct 5 2012 Broadband Sources , Tunable Sources
  
  Spectrum compression of soliton pulses generates a narrow-linewidth pulse source that is rapidly wavelength-tunable across a broad range, making it suitable for novel applications. Advances in ultrashort-pulse laser technology have generated several new applications in the fields of laser processing, biomedical optics, opto-electronics, and related fields. 1, 2 However, conventional ultrashort-pulse lasers are limited by a requirement of quiet laboratory environments and water cooling. In addition, spectroscopy, optical coherence tomography (OCT), and nonlinear microscopy require both a wideband light source and a wavelength-tunable narrow-linewidth source. 2, 3 Moreover, tuning range is generally limited by the laser's gain bandwidth. Although ...
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  Mentions: Nagoya University Norihiko Nishizawa
20. Feature Of The Week 9/30/12: UCLA Researchers Demonstrate High Throughput OCT Operating at Record Axial Scan Rate of Nearly 100 MHz in the 800 nm Spectral Range
  
  Explore Optical Coherence Tomography News Sep 30 2012 NDE/NDT , Tunable Sources
  
  High-speed image acquisition in OCT is desirable as it is immune to motion artifacts and can be used to inspect a large field of view or a large number of parts in a short period of time. A group of researchers led by Keisuke Goda and Bahram Jalali at UCLA recently proposed and demonstrated high-throughput OCT that offers 1,000 times higher axial scan rate than conventional OCT in the 800 nm spectral range. This is made possible by employing photonic time-stretch for chirping a pulse train and transforming it into a passive swept source that operates at the sweep ...
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  Mentions: Bahram Jalali UCLA Keisuke Goda
21. Extended coherence length megahertz FDML and its application for anterior segment imaging
  
  Explore opticsinfobase.org Sep 28 2012 Ophthalmology , Tunable Sources
  
  We present a 1300 nm Fourier domain mode locked (FDML) laser for optical coherence tomography (OCT) that combines both, a high 1.6 MHz wavelength sweep rate and an ultra-long instantaneous coherence length for rapid volumetric deep field imaging. By reducing the dispersion in the fiber delay line of the FDML laser, the instantaneous coherence length and hence the available imaging range is approximately quadrupled compared to previously published MHz-FDML setups, the imaging speed is increased by a factor of 16 compared to previous extended coherence length results. We present a detailed characterization of the FDML laser performance. We demonstrate ...
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  Mentions: Desmond C. Adler Joseph M. Schmitt Wolfgang Wieser
22. A steady sweep
  
  Explore Nature Publishing Group Sep 7 2012 Tunable Sources
  
  For swept source optical coherence tomography and high-speed transient spectroscopy, micro-electromechanical-systems-based vertical-cavity surface-emitting lasers (MEMS-VCSELs) are an appealing optical source owing to their narrow linewidth, continuous single-mode tuning and high-speed tunability. In particular, a wide tuning range (>100 nm) near 1,310 nm would be extremely
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23. Estimation of shear wave velocity in gelatin phantoms utilizing PhS-SSOCT
  
  Explore SpringerLink Home Sep 2 2012 Ophthalmology , Tunable Sources
  
  We report a method for measuring shear wave velocity in soft materials using phase stabilized swept source optical coherence tomography (PhS-SSOCT). Wave velocity was measured in phantoms with various concentrations of gelatin and therefore different stiffness. Mechanical waves of small amplitudes (∼10 μm) were induced by applying local mechanical excitation at the surface of the phantom. Using the phase-resolved method for displacement measurement described here, the wave velocity was measured at various spatially distributed points on the surface of the tissue-mimicking gelatin-based phantom. The measurements confirmed an anticipated increase in the shear wave velocity with an increase in the gelatin ...
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  Mentions: Kirill V. Larin University of Houston University of Texas at Austin
24. 1065nm and 1310nm MEMS tunable VCSEL light source technology for OCT imaging
  
  Explore Home: SPIE.org Aug 20 2012 Tunable Sources
  
  A novel vertical-cavity surface-emitting laser with a microelectromechanical tuning element enables high-speed, centimeter-range optical coherence tomography. Optical coherence tomography (OCT) is a noninvasive optical imaging technique that can generate micron-resolution 2D and 3D images of tissue and other scattering materials.1 First demonstrated for imaging the human eye and coronary arteries in 1991,1 OCT has become a clinical standard for diagnosing and monitoring treatment of eye disease, with approximately 16 million ophthalmic OCT procedures performed in the US in 2010.2 OCT can also be used for intravascular imaging of plaque to assess heart disease, cancer biopsy imaging, developmental ...
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  Mentions: Massachusetts Institute of Technology James G. Fujimoto Thorlabs
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