Broadband Sources -Optical Coherence Tomography News

Articles in category: Broadband Sources

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1. Multifunctional Laser Device
  
  Explore patentscope.wipo.int May 1 2013 Patents , Broadband Sources
  
  A multifunctional laser device configured to be applicable as such in each of: multiple photon processes, nano structuring processes, optical coherence tomography, Terahertz (THZ) spectroscopy, THz imaging; or a combination of such processes; and comprising a mode-locked linear (X or Z-folded) fs laser resonator having a repetition rate of at least 300 MHz and 600 MHz at most and, thus, a corresponding short resonator length, said fs laser resonator further being a dispersive mirrors cavity having an average negative GDD (Group Delay Dispersion) in the spectral range of the laser operation, and being arranged to generate laser pulses with a ...
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  Mentions: Femtolasers
2. MODE-LOCKED Laser Light Source Device And Optical Coherence Tomography Apparatus Using Same
  
  Explore patentscope.wipo.int May 1 2013 Patents , Broadband Sources
  
  Provided is a mode-locked laser light source device capable of implementing laser light with a narrow oscillation spectral distribution. This mode-locked laser light source device comprises: a semiconductor optical amplifier (1) wherein carriers are generated by the injection of an injection current (I) thereinto, a pulse of laser light (P) is amplified by the consumption of the carriers, and phase modulation equivalent to self-phase modulation depending on the pulse intensity of the laser light (P) occurs due to a change in the density of carriers; a sweep modulation unit (3) which makes the oscillation wavelength of the pulse of the ...
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  Mentions: Topcon Medical Systems
3. Feature Of The Week 4/7/2013: Seoul National University Presentation on Fiber Laser Technology For Broadband Light Generation
  
  Explore Optical Coherence Tomography News Apr 6 2013 Broadband Sources
  
  Over the past decade fiber laser technology has made dramatic advances in a multitude of regimes. Such advances, firstly initiated with the development of continuous-wave fiber lasers of high average power, including ytterbium (Yb)-doped fiber lasers at ~1.1 um, erbium (Er)-doped fiber lasers at ~1.6 um, and thulium (Tm)-doped fiber at ~2 um, have made another great progress in fiber-based pulsed sources of high peak power. In particular, such fiber-based pulsed sources are very useful for nonlinear wavelength conversion, so that the continuum generation combined with fiber-based pulsed sources has become a vivid research area ...
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  Mentions: Seoul National University Yoonchan Jeong
4. Adaptive broadband continuum source at 1200–1400 nm based on an all-fiber dual-wavelength master-oscillator power amplifier and a high-birefringence fiber
  
  Explore opticsinfobase.org Apr 3 2013 Broadband Sources
  
  We experimentally analyze the stimulated Raman scattering characteristics of a high-birefringence fiber (HBF), which presents an extraordinary level of spectral broadening incurred by the strong nonlinear interaction between the pump and Stokes pulses via the polarization-mode dispersion and group-velocity dispersion of the fiber. We also investigate the impact of the inter-pulse time-delay on the additional spectra broadening when dual-wavelength pump pulses are used. Exploiting these unique SRS properties of the HBF, we develop a novel Raman continuum source based on an all-fiber dual-wavelength master-oscillator power amplifier that can generate a dip-free spectrum in the 1200−1400-nm spectral range. We finally ...
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  Mentions: Seoul National University Yoonchan Jeong
5. A new small-package super-continuum light source for optical coherence tomography
  
  Explore Conference Proceedings Mar 18 2013 Broadband Sources
  
  Broadband light sources provide a significant benefit for optical coherence tomography (OCT) imaging concerning the axial resolution. Light sources with bandwidths over 200 nm result in an axial resolution up to 2 microns. Such broad band OCT imaging can be achieved utilizing super continuum (SC) light sources. The main important disadvantage of commercial SC light sources is the overall size and the high costs. Therefore, the use of SC light sources in small OCT setups and applications is limited. We present a new small housing and costeffective light source, which is suitable for OCT imaging. The used light source has ...
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  Mentions: Sven Meissner Dresden University of Technology Edmund Koch
6. Supercontinuum sources make their presence felt
  
  Explore optics.org Feb 12 2013 Microscopy , Broadband Sources
  
  Market for the ultra-broadband sources and related technology estimated at $50 million, with microscopy a key application. After transitioning from a laboratory curiosity to a genuine commercial tool in recent years, supercontinuum sources have emerged to create a fledgling marketplace. The point was one of several made by Wilhelm Kaenders, co-founder and co-president of Toptica Photonics, at the Lasers & Photonics Marketplace Seminar in San Francisco last week. “This new light source is finding applications in fields ranging from optical coherence tomography (OCT), frequency metrology, and fluorescence lifetime imaging microscopy (FLIM), to optical communications and gas sensing,” he told the conference ...
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  Mentions: NKT Photonics Toptica Photonics Fianium
7. Dispersion-flattened supercontinuum light source design at center wavelength for high resolution optical coherence tomography in ophthalmology
  
  Explore ScienceDirect Nov 27 2012 Ophthalmology , Broadband Sources
  
  Optimal wavelength light sources are designed for medical imaging to overcome the effects of the dispersion of the sampling medium of biological tissues which contain about 60% water in normal tissues and 90% water in anatomic structures such as in the eye. Based on highly nonlinear photonic crystal fiber (HNL-PCF), two light sources are designed at center wavelength as the influences of the dispersion of the main component of biological tissues on the resolution of optical coherence tomography (OCT) can be eliminated. Using finite element method with a circular perfectly matched boundary layer, it is shown through simulations that the ...
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  Mentions: University of the Ryukyus
8. Quantum dot selective area intermixing for broadband light sources
  
  Explore opticsinfobase.org Nov 21 2012 Broadband Sources
  
  We report a comparison of different capping materials on the intermixing of modulation p-doped InAs/In(Ga)As quantum dots (QD). QD materials with different caps are shown to exhibit significant difference in their optical properties during the annealing process. The selective area intermixing technique is demonstrated to laterally integrate two and three different QD light emitting devices with a single electrical contact. A spectral bandwidth of 240nm centered at 1188nm is achieved in a device with two sections. By calculating the point spread function for the obtained emission spectra, and applying the Rayleigh criteria for resolution, an axial resolution ...
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  Mentions: University of Sheffield Steven J. Matcher Richard A. Hogg
9. High-resolution optical coherence tomography using broadband light source with strain-controlled InAs/GaAs quantum dots
  
  Explore Wiley Online Library Nov 3 2012 Broadband Sources
  
  Recently, there has been an increasing interest in broadband light sources to develop a biomolecular imaging technique called optical coherence tomography (OCT). We fabricated superluminescent diodes (SLDs) using three kinds of quantum dot (QD) layers with different emission wavelength in the active region. The emission wavelength was controlled by reducing the strain in QDs by using In 0.1 Ga 0.9 As strain-reducing layer. The SLD device showed a broad electroluminescence spectrum with the center wavelength of 1104 nm and the spectral linewidth of 122 nm at the injection of 40 mA, which corresponds to the theoretical axial resolution ...
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  Mentions: Kobe University Graduate School of Medicine
10. Broadband Discrete Spectrum Optical Source
  
  Explore patentscope.wipo.int Nov 1 2012 Patents , Broadband Sources
  
  A new broadband discrete spectrum light source comprising a gain medium placed in a feedback cavity is disclosed. A design for a feedback cavity including reflectors having raised-edge reflectivity is presented. Bandwidth enhancement is achieved by selectively enhancing the intensity of the discrete emission lines near the band edges of the gain medium spectrum. The bandwidth of a broadband discrete spectrum light source is further enhanced by digitally applying a spectral correction to each detected signal according to a predetermined correction profile. A combined effect of using a broadband discrete spectrum light source and applying spectral correction to the detected ...
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11. Feature Of The Week 10/21/12: Cell Death Detection by Quantitative Three-Dimensional Single-Cell Tomography
  
  Explore Optical Coherence Tomography News Oct 20 2012 Oncology , Broadband Sources
  
  The aim of cancer therapies is mainly to stop cell proliferation or induce cell death. Cell death regulation is important for normal development and homeostasis. Cancer cells escape from death signals and continue their abnormal proliferation. Therefore, the ability to induce death in cancer cells has been a crucial biomarker for the efficacy of chemotherapeutic agents. However, individual cancer cells, even from the same population, vary greatly in their response to cell death stimuli. Measuring the response at the single-cell levels provide further pharmacokinetic and pharmacodynamics information, which aids drug development and regimen design. Developing a microscopic technology with non-invasive ...
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  Mentions: National Taiwan University Sheng-Lung Huang Jeng-Wei Tjiu
12. 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
13. Supercontinuum sources in optical coherence tomography: A state of the art and the application to scan-free time domain correlation techniques and depth dependant dispersion compensation
  
  Explore ScienceDirect Sep 18 2012 Broadband Sources
  
  Supercontinuum generation and the development of light sources based on these effects are discussed. We especially emphasize on the use of such sources for optical coherence tomography imaging after a brief overview of OCT systems. Finally we demonstrate the use of a commercial supercontinuum in the frame of ‘scan-free’ time domain correlation and optically processed depth dependant dispersion Compensation.
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  Mentions: Institut d'Optique
14. Discrete spectrum broadband optical source
  
  Explore uspto.gov Sep 18 2012 Patents , Broadband Sources
  
  A new broadband source having a discrete set of spectral emission lines having high peak power in each line is provided by placing a gain medium in a reflective cavity comprising reflective front and back surfaces. A cavity feedback factor less than unity is achieved by providing reflectivity of one surface substantially lower than the reflectivity of the other surface such that spontaneous emission in the gain medium is linearly amplified just below the lasing threshold. In an alternative arrangement, a movable external back surface placed at a prescribed distance from the gain medium provides a means to achieve a ...
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15. Broadband discrete spectrum optical source
  
  Explore uspto.gov Sep 4 2012 Patents , Broadband Sources
  
  A new broadband discrete spectrum light source comprising a gain medium placed in a feedback cavity is disclosed. A design for a feedback cavity including reflectors having raised-edge reflectivity is presented. Bandwidth enhancement is achieved by selectively enhancing the intensity of the discrete emission lines near the band edges of the gain medium spectrum. The bandwidth of a broadband discrete spectrum light source is further enhanced by digitally applying a spectral correction to each detected signal according to a predetermined correction profile. A combined effect of using a broadband discrete spectrum light source and applying spectral correction to the detected ...
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16. Ultrahigh resolution optical coherence tomography
  
  Explore IEEE Xplore Aug 28 2012 Broadband Sources
  
  We have been investigating ultrahigh resolution optical coherence tomography using supercontinuum. Low noise, Gaussian like supercontinua were generated at five wavelength regions. Ultrahigh resolution cross-sectional and three dimensional imaging were demonstrated for biomedical tissues and materials.
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  Mentions: Nagoya University Norihiko Nishizawa
17. Ultrahigh resolution spectral-domain optical coherence tomography at 1.3 μm using a broadband superluminescent diode light source
  
  Explore ScienceDirect Aug 16 2012 Broadband Sources
  
  We present an ultrahigh resolution spectral-domain optical coherence tomography imaging system using a broadband superluminescent diode light source emitting at a center wavelength of 1.3 μm. The light source consists of two spectrally shifted superluminescent diodes that are coupled together into a single mode fiber. The effective emission power spectrum has a full width at half maximum of 200 nm and the source output power is 10 mW. The imaging system has an axial resolution of 3.9 μm in air (<3.0 μm in biological tissue), and a lateral resolution of 6.5 μm. The sensitivity and the ...
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  Mentions: Arnaud Dubois Institut d'Optique
18. Generation and application of high-quality supercontinuum sources
  
  Explore ScienceDirect Aug 15 2012 Broadband Sources
  
  Ultrawideband supercontinua have been generated using ultrashort pulses and zero-dispersion highly nonlinear fiber. However, they have inherent large noise and spectral fine structure. We generated a widely and flatly broadened, low-noise, highly coherent, high-quality supercontinuum and used it to demonstrate ultrahigh-resolution optical coherence tomography in several wavelength regions.
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  Mentions: Nagoya University Norihiko Nishizawa
19. Mode-locked laser device, ultrashort pulse light source device, broad bandwidth light source device, non-linear optical microscopy device, recording device and optical coherence tomography device
  
  Explore uspto.gov Aug 7 2012 Patents , Broadband Sources
  
  There is provided a mode-locked laser device including: a resonator; a solid-state laser medium that is disposed in the resonator and outputs oscillation light in accordance with the incidence of excitation light; a saturable absorber that is disposed in the resonator and induces soliton mode-locking; a group velocity dispersion correction component that is disposed in the resonator and controls group velocity dispersion in the resonator; and an excitation portion that causes excitation light to be incident at the solid-state laser medium, wherein a resonator length of the resonator is at least a resonator length with which soliton mode-locking is inducible ...
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  Mentions: Fujifilm Medical Systems
20. Postdoctoral Position on Commercial Broadband Sources for OCT at 850nm Superlum Ireland
  
  Explore Optical Coherence Tomography News Aug 3 2012 Broadband Sources , Jobs & Studentships
  
  The Experienced Researcher at Superlum will be responsible for developing commercial quality broadband semiconductor SOAs with a fiber-to-fiber gain greater than 25dB over the wavelength range 790-910nm, and over the range of 1000-1100 nm. He/she will also work very closely with the Tyndall National Institute (Cork) and University of St. Andrews (UK) on the application of such SOAs for rapid swept sources for OCT. Good knowledge of the physics of laser diodes and laser diode amplifiers including processes of spontaneous and stimulated emission in quantum-confined heterostructures, and hands-on experience in building characterization and test systems for laser diodes and ...
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  Mentions: Université Pierre et Marie Curie Superlum University of St. Andrews
21. Modeling of low coherence interferometry using broadband multi-Gaussian light sources
  
  Explore SpringerLink Home Jul 9 2012 Broadband Sources
  
  Abstract Using a low coherence interferometry (LCI) model, a comparison of broadband single-Gaussian and multi-Gaussian light sources has been undertaken. For single-Gaussian sources, the axial resolution improves with the source bandwidth, confirming the coherence length relation that the resolution for single Gaussian sources improves with increasing spectral bandwidth. However, narrow bandwidth light sources result in interferograms with overlapping strata peaks and the loss of individual strata information. For multiple-Gaussian sources with the same bandwidth, spectral side lobes increase, reducing A-scan reliability to show accurate layer information without eliminating the side lobes. The simulations show the conditions needed for the resolution ...
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22. Fiber light source with high mean wavelength stability and reliability
  
  Explore uspto.gov Jun 26 2012 Patents , Broadband Sources
  
  A broadband light source configured to emit a stable broadband optical beam is provided. The broadband light source includes at least one optical pump source, an optical system including a polarization beam combiner, and a solid state laser medium. The optical system is configured to receive at least one optical pump beam from a respective one of the at least one optical pump source. The solid state laser medium receives a substantially unpolarized pump beam from a first output of the optical system. Stable broadband amplified spontaneous emission is output from a second output of the optical system.
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23. Spectrally Sampled OCT Imaging Based on 1.7um Continuous-Wave Supercontinuum Source
  
  Explore IEEE Xplore Jun 5 2012 Broadband Sources
  
  We demonstrate a novel multiwavelength light source around the 1.7um region based on continuous-wave (CW) supercontinuum (SC) generation for the deeper imaging of low-water-absorption sample with a spectrally sampled optical coherence tomography (OCT) system. This self-regulated Gaussian spectrum of CW SC source has an extremely smooth flat width with more than 210-nm full-width at half-maximum bandwidth centered at the 1.7um region, a high output power of 500 mW, and a low temporal instability with less than 0.1 dB for an hour. In order to improve the OCT signal sensitivity without increasing the optical illumination power, a multiwavelength ...
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  Mentions: Seoul National University Myung Yung Jeong Chang-Seok Kim
24. Ultrabroadband supercontinuum generation in a CMOS-compatible platform
  
  Explore opticsinfobase.org May 9 2012 Broadband Sources
  
  We demonstrate supercontinuum generation spanning 1.6 octaves in silicon nitride waveguides. Using a 4.3 cm-long waveguide, with an effective nonlinearity of γ=1.2 W −1 m −1 , we generate a spectrum extending from 665 nm to 2025 nm (at −30 dB ) with 160 pJ pulses. Our results offer potential for a robust, integrated, and low-cost supercontinuum source for applications including frequency metrology, optical coherence tomography, confocal microscopy, and optical communications.
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  Mentions: Johns Hopkins University Cornell University
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