1. Articles in category: Broadband Sources

    1-24 of 266 1 2 3 4 ... 9 10 11 »
    1. Hamamatsu develops bright supercontinuum source

      Hamamatsu develops bright supercontinuum source

      Hamamatsu Photonics has developed a supercontinuum light source, also known the SC light source, that produces higher brightness – approximately 1000 times higher than the company’s own range of xenon lamps. At the same time, the SC source maintains the high stability equivalent to that of xenon lamps by optimizing output conditions and also using a high nonlinear optical fiber as its nonlinear optical material. This source is targeting the market for measuring the complex structure of semiconductor optical measurements. The company added that its official commercial release will be in the spring of 2019. The new SC light source ...

      Read Full Article
    2. Wavelength Dependence of Ultrahigh-Resolution Optical Coherence Tomography Using Supercontinuum for Biomedical Imaging

      Wavelength Dependence of Ultrahigh-Resolution Optical Coherence Tomography Using Supercontinuum for Biomedical Imaging

      Optical coherence tomography (OCT) is a noninvasive cross-sectional imaging technique with micrometer resolution. The theoretical axial resolution is determined by the center wavelength and bandwidth of the light source, and the wider the bandwidth, the higher the axial resolution. The characteristics of OCT imaging depend on the optical wavelength used. In this paper, we investigated the wavelength dependence of ultrahigh-resolution (UHR) OCT using a supercontinuum for biomedical imaging. Wideband, high-power, low-noise supercontinua (SC) were generated at λ = 0.8, 1.1, 1.3, and 1.7 μ m based on ultrashort pulses and nonlinear fibers. The wavelength dependence of OCT imaging was ...

      Read Full Article
    3. Near-infrared and mid-infrared semiconductor broadband light emitters

      Near-infrared and mid-infrared semiconductor broadband light emitters

      Semiconductor broadband light emitters have emerged as ideal and vital light sources for a range of biomedical sensing/imaging applications, especially for optical coherence tomography systems. Although near-infrared broadband light emitters have found increasingly wide utilization in these imaging applications, the requirement to simultaneously achieve both a high spectral bandwidth and output power is still challenging for such devices. Owing to the relatively weak amplified spontaneous emission, as a consequence of the very short non-radiative carrier lifetime of the inter-subband transitions in quantum cascade structures, it is even more challenging to obtain desirable mid-infrared broadband light emitters. There have been ...

      Read Full Article
    4. Flatly Broadened and Highly Coherent Supercontinuum Generation by Induced Modulation Instability in ANDi-PCF

      Flatly Broadened and Highly Coherent Supercontinuum Generation by Induced Modulation Instability in ANDi-PCF

      In this paper, a flatly broadened and highly coherent supercontinuum generation by induced modulation instability in ANDi-PCF is proposed. The numerical results show that the bandwidth of supercontinuun can be increased by increasing the modulation depth and the coherence property of supercontinuum can be improved with the optimal modulation frequency. A highly coherent supercontinuum with the 10 dB bandwidth of 1305 nm and the flatness of less than 10 dB can be obtained when seeding at the modulation depth of 0.3 and modulation frequency of 24 THz.

      Read Full Article
    5. Q-switched based supercontinuum source towards low-cost ultra-high resolution optical coherence tomography

      Q-switched based supercontinuum source towards low-cost ultra-high resolution optical coherence tomography

      Supercontinuum (SC) light source is certainly one of the best option for ultra-high resolution optical coherence tomography (UHR-OCT). Over the last few years several demonstrations have been done for each commonly used wavelength range [1-2-3]. Nowadays, SC dedicated to UHR-OCT is a mature technology with turn-key commercially available system [4]. The new challenge to answer for SC source is the cost reduction one. In this study, we demonstrate that a Q-switched based SC (QS-SC) could be an alternative to the current state of the art SC based on a Mode-Locked laser (ML-SC). This QS-SC, whose cost is less than 15 ...

      Read Full Article
    6. Evolution of the Supercontinuum Light Source

      Evolution of the Supercontinuum Light Source

      For many applications, coherent light at a single frequency is more than adequate. But having a light source that combines the properties of a laser with the broad bandwidth of an incandescent bulb and a short pulse duration opens up a new realm of possibilities in medical imaging, communications, displays and materials studies. One of most extraordinary discoveries of optical effects came in 1970 from Robert Alfano and Stanley Shapiro 1 . The duo demonstrated the conversion of a narrow band color — for example, green light of short duration — to white color and beyond. This was accomplished by nonlinear effect, and ...

      Read Full Article
    7. Ultra-low noise supercontinuum source for ultra-high resolution optical coherence tomography at 1300 nm

      Ultra-low noise supercontinuum source for ultra-high resolution optical coherence tomography at 1300 nm

      Supercontinuum (SC) sources are of great interest for many applications due to their ultra-broad optical bandwidth, good beam quality and high power spectral density [1]. In particular, the high average power over large bandwidths makes SC light sources excellent candidates for ultra-high resolution optical coherence tomography (UHR-OCT) [2-5]. However, conventional SC sources suffer from high pulse-to-pulse intensity fluctuations as a result of the noise-sensitive nonlinear effects involved in the SC generation process [6-9]. This intensity noise from the SC source can limit the performance of OCT, resulting in a reduced signal-to-noise ratio (SNR) [10-12]. Much work has been done to ...

      Read Full Article
    8. Supercontinuum Generation Using Microstructured Optical Fibers

      Supercontinuum Generation Using Microstructured Optical Fibers

      The supercontinuum generation results generally from the synergy between several fundamental nonlinear processes, such as selfphase modulation, cross-phase modulation, stimulated Raman scattering, and four-wave mixing. The relative importance of these processes depends on the spectral location and power of the pump, as well as the nonlinear and dispersive characteristics of the medium. Several types of microstructured optical fibers with optimized designs, have been developed during the recent years in order to enhance the supercontinuum generation. This paper provides an overview of the peculiar dispersive and nonlinear properties exhibited by these fibers, including the supercontinuum generation by femtosecond pumping.

      Read Full Article
    9. EXALOS to Present Invited Paper on Gallium Nitride-based Superluminescent Light Emitting Diodes (SLEDs) at Photonics West 2018

      EXALOS to Present Invited Paper on Gallium Nitride-based Superluminescent Light Emitting Diodes (SLEDs) at Photonics West 2018

      EXALOS, the world’s leading developer of visible Superluminescent Light Emitting Diodes (SLEDs), will present an invited paper at the OPTO conference held during the SPIE Photonics West event at the Moscone Center, San Francisco, CA, from January 27th to February 1st, 2018. The paper [10532-67] entitled, “Recent progress on GaN-based superluminescent light-emitting diodes in the visible range” and authored by Antonino Castiglia, Marco Rossetti, Marco Malinverni, Christian Mounir, Nicolai Matuschek, Marcus Duelk, and Christian Velez, will be presented by Dr. Antonino Castiglia at 2.00 pm on Thursday, February 1st, 2018, in room 216 (south level 2, Moscone Center ...

      Read Full Article
    10. EXALOS Achieves a New Milestone for Next Generation Display Technologies with its First Cyan-Green Superluminescent Light Emitting Diode (SLED)

      EXALOS Achieves a New Milestone for Next Generation Display Technologies with its First Cyan-Green Superluminescent Light Emitting Diode (SLED)

      EXALOS, the world’s leading developer of visible Superluminescent Light Emitting Diodes (SLEDs), has successfully produced its first cyan-green SLED. With an output wavelength of 495 nm in between the company’s existing red (640 nm, GaAs) and blue (450 nm, GaN) devices, this SLED represents a major step toward a complete red-green-blue (RGB) SLED illumination source for micro-displays in augmented reality applications, head-up display architectures, etc. SLEDs are broadband semiconductor devices that are closely related to their more commonly known relatives, laser diodes (LDs) and light-emitting diodes (LEDs). Following the successful demonstration of blue SLEDs, Exalos embarked upon a ...

      Read Full Article
      Mentions: Exalos
    11. Broadband supercontinuum generation spanning 1.5–13 μm in Ge11.5As24Se64.5 based chalcogenide glass step index optical fiber

      Broadband supercontinuum generation spanning 1.5–13 μm in Ge11.5As24Se64.5 based chalcogenide glass step index optical fiber

      We have reported a design of a step index optical fiber in Ge 11.5 As 24 Se 64.5 chalcogenide glass. The proposed design of optical fiber is analyzed using full vectorial finite element method. The structure offers a high nonlinear coefficient of 1431 W −1  km −1 . Due to this high nonlinearity of the optical fiber a supercontinuum spectrum ranging from 1.5–13 μm is generated in only 10 mm long fiber by applying 50 fs laser secant pulses of 4000 W peak power at the pump wavelength of 3.1 μm. The use of femtosecond pulse ...

      Read Full Article
    12. Growth of quantum three-dimensional structure of InGaAs emitting at ~1 µm applicable for a broadband near-infrared light source

      Growth of quantum three-dimensional structure of InGaAs emitting at ~1 µm applicable for a broadband near-infrared light source

      We obtained a high-intensity and broadband emission centered at ~1 µm from InGaAs quantum three-dimensional (3D) structures grown on a GaAs substrate using molecular beam epitaxy. An InGaAs thin layer grown on GaAs with a thickness close to the critical layer thickness is normally affected by strain as a result of the lattice mismatch and introduced misfit dislocations. However, under certain growth conditions for the In concentration and growth temperature, the growth mode of the InGaAs layer can be transformed from two-dimensional to 3D growth. We found the optimal conditions to obtain a broadband emission from 3D structures with a ...

      Read Full Article
    13. 840nm superluminescent LEDs target medical imaging

      840nm superluminescent LEDs target medical imaging

      The 840-nm SLEDs can provide an output power of more than 20mW from a single-mode fibre and a have 3-dB spectral bandwidths of more than 50nm. They are especially suited for medical imaging applications such as Optical Coherence Tomography (OCT) and fibre optic sensor applications thanks to their high output power and large spectral bandwidth. The standard product is delivered in a 14-pin Butterfly housing with a monitor photodiode and an FC/APC connector. All devices are based on Exalos’ proprietary design.

      Read Full Article
      Mentions: Exalos
    14. EXALOS releases NEW High-Power 840nm Superluminescent Light Emitting Diodes (SLEDs) for Medical Imaging and Sensor applications:

      EXALOS releases NEW High-Power 840nm Superluminescent Light Emitting Diodes (SLEDs) for Medical Imaging and Sensor applications:

      EXALOS releases NEW High-Power 840nm Superluminescent Light Emitting Diodes (SLEDs) for Medical Imaging and Sensor applications: For SD-OCT applications, higher output power from the SLED allow for more asymmetric splitting ratios in the interferometer and therefore in lower losses for the received OCT signal, enabling higher acquisition speeds or higher sensitivity. Higher-power SLEDs also help realizing surgical ophthalmic systems or multi-modal imaging systems where the OCT path is shared and therefore experiences higher losses.

      Read Full Article
      Mentions: Exalos
    15. Supercontinuum Generation in Silica Photonic Crystal Fiber at 1.3 μm and 1.65 μm Wavelengths for Optical Coherence Tomography

      Supercontinuum Generation in Silica Photonic Crystal Fiber at 1.3 μm and 1.65 μm Wavelengths for Optical Coherence Tomography

      A new design of all-normal near zero flattened dispersion based on silica photonic crystal fiber is reported to generate an ultra-broadband supercontinuum in the near infrared region. The optimized design offers all normal near zero ultra-flattened dispersion of −7 [ps/nm km] in the wavelengths range [1000 nm–2000 nm]. The investigated design allows ultra-broadband supercontinuum spectra of 600 nm and 1129 nm around wavelengths of 1.3 and 1.65 μm with a short device length of 34 mm and 8.36 mm respectively. The resulting supercontinuums have the potential to enhance the axial resolution of optical coherence tomography ...

      Read Full Article
    16. Supercontinuum light source

      Supercontinuum light source

      A supercontinuum light source includes a microstructured optical fiber, and a feeding unit arranged for feeding pump pulses to the microstructured optical fiber, wherein the feeding unit comprises a picosecond laser and one or more amplifiers, wherein the microstructured optical fiber is a silica fiber wherein at least a part of the core being of silica or doped silica, and including a core including core material and a cladding surrounding the core, and at least the core material is loaded with deuterium to have an OD absorption peak around 1870 nm, wherein the feeding unit is spliced to the microstructured ...

      Read Full Article
      Mentions: NKT Photonics
    17. Axial resolution and signal-to-noise ratio in deep-tissue imaging with 1.7-μm high-resolution optical coherence tomography with an ultrabroadband laser source

      Axial resolution and signal-to-noise ratio in deep-tissue imaging with 1.7-μm high-resolution optical coherence tomography with an ultrabroadband laser source

      We investigated the axial resolution and signal-to-noise ratio (SNR) characteristics in deep-tissue imaging by 1.7 - μ m 1.7-μm optical coherence tomography (OCT) with the axial resolution of 4.3    μ m 4.3  μm in tissue. Because 1.7 - μ m 1.7-μm OCT requires a light source with a spectral width of more than 300 nm full-width at half maximum to achieve such high resolution, the axial resolution in the tissue might be degraded by spectral distortion and chromatic dispersion mismatching between the sample and reference arms. In addition, degradation of the axial resolution would also lead to ...

      Read Full Article
    18. 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 ...

      Read Full Article
      Mentions: NKT Photonics
    19. 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 ...

      Read Full Article
    20. 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 ...

      Read Full Article
    21. 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 ...

      Read Full Article
    22. 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.

      Read Full Article
    23. 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 ...

      Read Full Article
    24. 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 ...

      Read Full Article
    1-24 of 266 1 2 3 4 ... 9 10 11 »
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. Popular Articles