1. Articles in category: Broadband Sources

    1-24 of 249 1 2 3 4 ... 9 10 11 »
    1. New SuperK MIR brings supercontinuum into the mid-IR

      New SuperK MIR brings supercontinuum into the mid-IR

      With their ultra-broad spectrum, diffraction-limited beam quality and robust fiber architecture, supercontinuum white light lasers have long been the light source of choice in demanding applications from fluorescence microscopy and bio-imaging to spectroscopy and industrial metrology. Based on NKT Photonics proven supercontinuum platform, the new SuperK MIR now offers the same benefits as the visible and near-infrared sources with an output in the mid-infrared. The SuperK MIR laser delivers more than 450 mW of continuous light from 0.9 to 4.2 μm. The source features a monolithic all-fiber architecture ensuring stability and maintenance-free operation over thousands of hours. The ...

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      Mentions: NKT Photonics
    2. Wide Broadband ASE Source based on Thulium-doped Fibre for 2 μm Wavelength Region

      Wide Broadband ASE Source based on Thulium-doped Fibre for 2 μm Wavelength Region

      This paper investigates the generation of the amplified spontaneous emission (ASE) from thulium-doped silica fibre pumped at 1570 nm. The developed model provides the ASE spectral power at short and long wavelength bands by using two different thulium doped fibre types with optimized fibre length. Shorter wavelengths in the emission band can be accessed with a short thulium fibre, whereas longer wavelengths can be obtained using a long thulium fibre. Our findings reveal that, in contrast to a 100 nm (1800nm- 1900nm) and 70 nm (1900nm-1970nm) broadband source at short and long wavelength bands, a broader spectrum source can be ...

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    3. Supercontinuum Generation in a Silicon Nanowire Embedded Photonic Crystal Fiber for Optical Coherence Tomography Applications (Book Chapter)

      Supercontinuum Generation in a Silicon Nanowire Embedded Photonic Crystal Fiber for Optical Coherence Tomography Applications (Book Chapter)

      In this paper, we design a silicon nanowire embedded photonic crystal fiber (SN-PCF) using fully vectorial finite element method. Further, we analyze the various optical properties, namely, waveguide dispersion and nonlinearity by varying the core diameter from 400 to 500 nm for a wide range of wavelengths from 0.8 to 1.7 μm. The proposed structure exhibits a low second (−0.4909 ps 2 /m) and third order (0.6595 10 −3 ps 3 /m) dispersions with very high nonlinearity (1358 W −1 m −1 ) for 480 nm core diameter at 0.8 μm wavelength. Besides, we investigate the ...

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    4. Superluminescent LEDs Bridge the Gap

      Superluminescent LEDs Bridge the Gap

      Optical coherence tomography (OCT) is perhaps the most widely known application for SLED sources. This noninvasive imaging technique produces real-time, cross-sectional images with a resolution of a few microns. In just 20 years, it has become a well-established medical procedure in the fields of ophthalmology, cardiology, gastroenterology and dermatology, with a market size approaching $1 billion for system sales. While swept source lasers have received much attention with the switch to higher resolution spectral domain (SD)-OCT about a decade ago, SLEDs still remain the preferred light source for most OEM applications because of their simplicity, compactness and cost. OCT ...

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    5. An All-fiber Supercontinuum Source with 30.6 W High Power and Ultra-wide Spectrum Ranging from 385 nm to Beyond 2400 nm

      An All-fiber Supercontinuum Source with 30.6 W High Power and Ultra-wide Spectrum Ranging from 385 nm to Beyond 2400 nm

      An all-fiber high power, blue-enhanced supercontinuum generation in a piece of uniform photonic crystal fiber pumped by a picosecond Yb-doped master oscillator power amplifier (MOPA) is experimentally demonstrated. The MOPA source is seeded by an actively dissipative soliton (DS) mode-locked Yb-doped fiber laser with a fundamental repetition rate of ~15.33 MHz and a large chirp. By introducing giant chirp to the seed pulses and optimizing the pump power in every stage of the MOPA, a SC with 30.6 W output average power and an extremely wide spectrum of 385 nm to beyond 2400 nm is obtained.

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    6. A comparative study of noise in supercontinuum light sources for ultra-high resolution optical coherence tomography at 1300 nm

      A comparative study of noise in supercontinuum light sources for ultra-high resolution optical coherence tomography at 1300 nm

      Supercontinuum (SC) light is a well-established technology, which finds applications in several domains ranging from chemistry to material science and imaging systems [1-2]. More specifically, its ultra-wide optical bandwidth and high average power make it an ideal tool for Optical Coherence Tomography (OCT). Over the last 5 years, numerous examples have demonstrated its high potential [3-4] in this context. However, SC light sources present pulse-to-pulse intensity variation that can limit the performance of any OCT system [5] by degrading their signal to noise ratio (SNR). To this goal, we have studied and compared the noise of several SC light sources ...

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    7. Gallium nitride light sources for optical coherence tomography

      Gallium nitride light sources for optical coherence tomography

      The advent of optical coherence tomography (OCT) has permitted high-resolution, non-invasive, in vivo imaging of the eye, skin and other biological tissue. The axial resolution is limited by source bandwidth and central wavelength. With the growing demand for short wavelength imaging, super-continuum sources and non-linear fibre-based light sources have been demonstrated in tissue imaging applications exploiting the near-UV and visible spectrum. Whilst the potential has been identified of using gallium nitride devices due to relative maturity of laser technology, there have been limited reports on using such low cost, robust devices in imaging systems. A GaN super-luminescent light emitting diode ...

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    8. Device for emitting super-continuous wide-band light and uses thereof

      Device for emitting super-continuous wide-band light and uses thereof

      The disclosed broadband supercontinuum light emitting device includes a nonlinear optical fiber, a pump system, a cavity, and an active medium. The active medium may comprise an active fiber and may be located inside the cavity. The active medium is configured and arranged, by means of a pumping provided by the pump system, to generate and emit chaotic pulses of laser light towards the nonlinear optical fiber, which excite the nonlinear effects thereof for the generation and emission of supercontinuum light in the form of pulses of light distributed randomly over time. Numerous uses of the device are disclosed for ...

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    9. Luxmux Prism Award Finalist for New Compact Broadband Light Source

      Luxmux Prism Award Finalist for New Compact Broadband Light Source

      LUXMUX Technology Corporation ( Calgary, AB ) announced that that it will introduce its latest product, the BeST-SLED ® broadband light source at the Photonics West exhibition, Booth #4137, to be held from January 28-February 2 at the Moscone Center in San Francisco. The BeST-SLED ® has been selected as a finalist for the PRISM award for photonics innovation because of its' stability, compact size, low cost/performance ratio, wide spectral range and high power. The BeST-SLED ® is a multiple superluminescent diode light source within a single butterfly package that provides up to 50mW of power over the spectral band of 1230nm to 1730nm ...

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    10. Quantum Well and Quantum Dot broadband Optical Devices for Optical Coherence Tomography Applications (Thesis)

      Quantum Well and Quantum Dot broadband Optical Devices for Optical Coherence Tomography Applications (Thesis)

      In this thesis quantum well (QW) and quantum dot (QD) based devices are investigated with the aim of obtaining broad bandwidth light sources for optical coherence tomography (OCT) applications. QD based structures have many possible advantages for broadband applications due to their inhomogeneous broadening. However, more investigation is required in order to fulfill this potential. Firstly, in chapter one, an introduction to the fundamental principles of semiconductor heterostructures is provided followed by basic concepts of OCT. The experimental techniques used in this thesis are outlined and briefly discussed. Brief reviews of the gain measurement techniques which have been used throughout ...

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    11. High-speed and high-sensitivity parallel spectral-domain optical coherence tomography using a supercontinuum light source

      High-speed and high-sensitivity parallel spectral-domain optical coherence tomography using a supercontinuum light source

      The three most important metrics in optical coherence tomography (OCT) are resolution, speed, and sensitivity. Because there is a complex interplay between these metrics, no previous work has obtained the best performance in all three metrics simultaneously. We demonstrate that a high-power supercontinuum source, in combination with parallel spectral-domain OCT, achieves an unparalleled combination of resolution, speed, and sensitivity. This system captures cross-sectional images spanning 4    mm × 0.5    mm 4  mm×0.5  mm at 1,024,000 lines/s with 2 × 14    μm 2×14  μm resolution ( axial × transverse axial×transverse ) at a sensitivity of 113 dB. Imaging ...

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    12. Supercontinuum light source, a system and a method of measuring

      Supercontinuum light source, a system and a method of measuring

      A supercontinuum light source comprising an intermediate supercontinuum light source and a single mode coupling unit, an optical measurement system comprising such light source, as well as a method of measuring are described. The supercontinuum light source comprises a pulse frequency multiplier to increase the repetition rate and the single mode coupling unit is arranged to dampen and shape the spectrum from the intermediate supercontinuum light source to allow measurements with a reduced noise floor.

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      Mentions: NKT Photonics
    13. Wideband ultrafast fiber laser sources for OCT and metrology

      Wideband ultrafast fiber laser sources for OCT and metrology

      Fiber lasers, which use optical fibers as ideal waveguides, have been attracting a great deal of attention as stable, practical, and maintenance-free lasers. Using a combination of an ultrashort-pulse fiber laser and a nonlinear fiber, we can realize wideband highly functional ultrafast fiber laser sources. The generation of ultrashort pulses with wide wavelength tunability and supercontinua based on fiber lasers and nonlinear fibers has been demonstrated. These techniques are useful for laser applications, especially for imaging and metrology. In this topical review, the fundamentals of and recent progress in wideband ultrafast fiber laser sources and their applications are reviewed mainly ...

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    14. 15 Open PhD Positions within Supercontinuum Light Sources and Applications at Technical University of Denmark

      15 Open PhD Positions within Supercontinuum Light Sources and Applications at Technical University of Denmark

      We are seeking 15 skilled candidates for PhD positions across Europe in supercontinuum light sources and applications. The candidates should have a background in physics and interest in nonlinear optics, fibre optics and waveguides, and laser physics. SUPUVIR ( SUPercontinuum broadband light sources covering UV to IR applications ) is a new Innovative Training Network (ITN) funded by the European H2020 programme. SUPUVIR will focus on so-called supercontinuum laser sources, which essentially are laser sources emitting coherent laser light that is broadband enough to be considered white. The PhD students will be given extensive knowledge in silica and soft-glass chemistry, preform design ...

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    15. Method and apparatus for producing supercontinuum light for medical and biological applications

      Method and apparatus for producing supercontinuum light for medical and biological applications

      A method and an apparatus are provided for producing SuperContinuum (SC) light for medical and biological applications is provided. Pulses are focused from a laser system into at least one of a pressurized cell and one or more fibers. A pump pulse is converted into the SC light at a specified rate of repetition. The SC light is applied at the specified rate of repetition to tissue for medical and biological applications.

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      Mentions: Robert R. Alfano
    16. Single all-fiber-based nanosecond-pulsed supercontinuum source for multispectral photoacoustic microscopy and optical coherence tomography

      Single all-fiber-based nanosecond-pulsed supercontinuum source for multispectral photoacoustic microscopy and optical coherence tomography

      We report the usefulness of a single all-fiber-based supercontinuum (SC) source for combined photoacoustic microscopy (PAM) and optical coherence tomography (OCT). The SC light is generated by a tapered photonic crystal fiber pumped by a nanosecond pulsed master oscillator power amplifier at 1064 nm. The spectrum is split into a shorter wavelength band (500–800 nm) for single/multi-spectral PAM and a longer wavelength band (800–900 nm) band for OCT. In vivo mouse ear imaging was achieved with an integrated dual-modality system. We further demonstrated its potential for spectroscopic photoacoustic imaging by doing multispectral measurements on retinal pigment epithelium ...

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    17. Simulation of broad spectral bandwidth emitters at 1060 nm for retinal optical coherence tomography

      Simulation of broad spectral bandwidth emitters at 1060 nm for retinal optical coherence tomography

      The simulation of broad spectral bandwidth light sources (semiconductor optical amplifiers (SOA) and superluminescent diodes (SLD)) for application in ophthalmic optical coherence tomography is reported. The device requirements and origin of key device parameters are outlined, and a range of single and double InGaAs/GaAs quantum well (QW) active elements are simulated with a view to application in different OCT embodiments. We confirm that utilising higher order optical transitions is beneficial for single QW SOAs, but may introduce deleterious spectral modulation in SLDs. We show how an addition QW may be introduced to eliminate this spectral modulation, but that this ...

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    18. Superluminescent diode with a broadband gain based on self-assembled InAs quantum dots and segmented contacts for an optical coherence tomography light source

      Superluminescent diode with a broadband gain based on self-assembled InAs quantum dots and segmented contacts for an optical coherence tomography light source

      We report a broadband-gain superluminescent diode (SLD) based on self-assembled InAs quantum dots (QDs) for application in a high-resolution optical coherence tomography (OCT) light source. Four InAs QD layers, with sequentially shifted emission wavelengths achieved by varying the thickness of the In 0.2 Ga 0.8 As strain-reducing capping layers, were embedded in a conventional p-n heterojunction comprising GaAs and AlGaAs layers. A ridge-type waveguide with segmented contacts was formed on the grown wafer, and an as-cleaved 4-mm-long chip (QD-SLD) was prepared. The segmented contacts were effective in applying a high injection current density to the QDs and obtaining ...

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    19. High-power supercontinuum generation using high-repetition-rate ultrashort-pulse fiber laser for ultrahigh-resolution optical coherence tomography in 1600 nm spectral band

      High-power supercontinuum generation using high-repetition-rate ultrashort-pulse fiber laser for ultrahigh-resolution optical coherence tomography in 1600 nm spectral band

      We describe the generation of a high-power, spectrally smooth supercontinuum (SC) in the 1600 nm spectral band for ultrahigh-resolution optical coherence tomography (UHR-OCT). A clean SC was achieved by using a highly nonlinear fiber with normal dispersion properties and a high-quality pedestal-free pulse obtained from a passively mode-locked erbium-doped fiber laser operating at 182 MHz. The center wavelength and spectral width were 1578 and 172 nm, respectively. The output power of the SC was 51 mW. Using the developed SC source, we demonstrated UHR-OCT imaging of biological samples with a sensitivity of 109 dB and an axial resolution of 4 ...

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    20. Optimal operational conditions for supercontinuum-based ultrahigh-resolution endoscopic OCT imaging

      Optimal operational conditions for supercontinuum-based ultrahigh-resolution endoscopic OCT imaging

      We investigated the optimal operational conditions for utilizing a broadband supercontinuum (SC) source in a portable 800 nm spectral-domain (SD) endoscopic OCT system to enable high resolution, high-sensitivity, and high-speed imaging in vivo . A SC source with a 3-dB bandwidth of ∼ 246     nm was employed to obtain an axial resolution of ∼ 2.7     μm (in air) and an optimal detection sensitivity of ∼ − 107     dB with an imaging speed up to 35 frames/s (at 70 k A-scans/s). The performance of the SC-based SD-OCT endoscopy system was demonstrated by imaging guinea pig esophagus in vivo , achieving image quality comparable to ...

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    21. Highly functional ultrashort pulse fiber laser sources and applications for optical coherence tomography

      Highly functional ultrashort pulse fiber laser sources and applications for optical coherence tomography

      We have been investigating highly functional ultrashort pulse fiber laser sources for highly sensitive, ultrahigh resolution optical coherence tomography (UHR-OCT). The coherent, low-noise, and Gaussian like wideband super-continuum (SC) sources were developed at five different wavelength regions between 0.8 and 1.7 um in order to investigate the wavelength dependence of OCT imaging. A real-time imaging was achieved with spectral domain OCT system. A fiber laser based, rapid, widely wavelength tunable narrow linewidth source was also developed. The UHR-OCT imaging of biological samples were demonstrated using the developed OCT systems.

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    22. Leica Microsystems and NKT Photonics sign supercontinuum laser supply contract

      Leica Microsystems and NKT Photonics sign supercontinuum laser supply contract

      Leica Microsystems signed a 14-month supply contract with NKT Photonics to deliver significant numbers of its market-leading SuperK EXTREME supercontinuum lasers. The SuperK EXTREME powers the Leica TCS SP8 X high-end confocal microscope used globally for high-resolution bio imaging. NKT Photonics CTO, Christian Poulsen on the collaboration with Leica Microsystems: “We have worked with Leica Microsystems since 2005 and their World-renowned dedication to quality and performance has been a great benchmark for us in our product development. Today, we are proud to deliver the best supercontinuum lasers in the industry - lasers worthy of the iconic Leica logo.” CEO Basil Garabet ...

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      Mentions: NKT Photonics Leica
    23. The Fabrication and Characterization Study of Broadband and High Resolution of Ce/Cr-Doped Crystal Fiber for Optical Coherence Tomography Light Sources (Thesis)

      The Fabrication and Characterization Study of Broadband and High Resolution of Ce/Cr-Doped Crystal Fiber for Optical Coherence Tomography Light Sources (Thesis)

      We report the fabrication and characteristics of Ce-doped fibers (CeDFs) and Cr-doped fibers (CDFs) based on drawing tower technique. The CeDFs show an emission from 480 to 650 nm, 600 to 800 nm, and 700 to 950 nm with a power density of 21.1 nW/nm, 79.1 nW/nm and 63.8 nW/nm, respectively. The CDFs exhibit an emission from 975 to 1300 nm with a power density of 27.3 nW/nm which was dominated by Cr4+ near-Gaussian ASE spectrum. For fiber-based OCT system, the measured broadband emission of CeDFs and CDFs showed four different high ...

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    24. Superluminescent diode and optical coherence tomography apparatus including the superluminescent diode

      Superluminescent diode and optical coherence tomography apparatus including the superluminescent diode

      A superluminescent diode which amplifies light through stimulated amplification and outputs emitted beams from one of edges at two ends includes a cladding layer of a first conductivity type formed on a semiconductor substrate, an active layer formed on the cladding layer of the first conductivity type, a cladding layer of a second conductivity type formed on the active layer, and a multilayer film formed at the other edge opposite to the one edge that emits the beams, reflectance of which has wavelength dependence, and a spectral shape of the emitted beams output from the one edge is controllable by ...

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