1. Articles in category: Broadband Sources

    1-24 of 277 1 2 3 4 ... 10 11 12 »
    1. EXALOS Introduces RGB Modules for Augmented Reality and Head-up Display Applications

      EXALOS Introduces RGB Modules for Augmented Reality and Head-up Display Applications

      Schlieren, Switzerland, May 6 th , 2019. EXALOS, the world’s leading developer of visible Superluminescent Light Emitting Diodes (SLEDs), has expanded its product porfolio with the introduction of a compact RGB SLED module that will enable the advancement of micro-display architectures for augmented reality (AR) and head-up displays (HUDs). The RGB module constitutes three SLED chips housed in a 14-pin butterfly package (20.8 mm x 1.7 mm) with a total output power of about 30 mW (~ 10 mW/color), which corresponds to a total luminous flux of 5 lm. The individual chips (635 nm (R), 510 nm (G ...

      Read Full Article
      Mentions: Exalos Kevin Hsu
    2. Supercontinuum light source comprising microstructured optical fiber

      Supercontinuum light source comprising microstructured optical fiber

      The invention relates to a microstructured optical fiber for generating supercontinuum light upon feeding of pump light. The light can be incoherent light. The microstructured optical fiber has a first section and a second section, where the first and second sections have one or more different features. The invention also relates to a supercontinuum source comprising a microstructured optical fiber according to the invention.

      Read Full Article
      Mentions: NKT Photonics
    3. Supercontinuum noise reduction by fiber undertapering

      Supercontinuum noise reduction by fiber undertapering

      We demonstrate that the Relative Intensity Noise (RIN) of a supercontinuum source can be significantly reduced using the new concept of undertapering, where the fiber is tapered to a diameter that is smaller than the diameter that gives the shortest blue edge, which is typically regarded as the optimum. We show that undertapering allows to control the second zero dispersion wavelength and use it as a soliton barrier to stop the redshifting solitons at a pre-defined wavelength, and thereby strongly reduce the RIN. We demonstrate how undertapering can reduce the spectrally averaged RIN in the optical coherence tomography bands, 500 ...

      Read Full Article
    4. Development of a broadband superluminescent diode based on self-assembled InAs quantum dots and demonstration of high-axial-resolution optical coherence tomography imaging

      Development of a broadband superluminescent diode based on self-assembled InAs quantum dots and demonstration of high-axial-resolution optical coherence tomography imaging

      We developed a near-infrared (NIR) superluminescent diode (SLD) based on self-assembled InAs quantum dots (QDs) and demonstrated high-axial-resolution optical coherence tomography (OCT) imaging using this QD-based SLD (QD-SLD). The QD-SLD utilized InAs QDs with controlled emission wavelengths as a NIR broadband light emitter, and a tilted waveguide with segmented electrodes was prepared for edge-emitting broadband electroluminescence (EL) spanning approximately 1–1.3 μm. The bandwidth of the EL spectrum was increased up to 144 nm at a temperature of 25 °C controlled using a thermoelectric cooler. The inverse Fourier transform of the EL spectrum predicted a minimum resolution of 3 ...

      Read Full Article
    5. Soliton microcomb based spectral domain optical coherence tomography

      Soliton microcomb based spectral domain optical coherence tomography

      Spectral domain optical coherence tomography (SD-OCT) has become a widely applied minimally invasive technique for bio-medical imaging[1–4], and industrial process control[5]. One of the most commonly used light source for SD-OCT is based on superluminescent diodes (SLD), which provide a low-noise broadband coverage.[6] Recent advances have allowed creating photonic integrated chipscale frequency combs, that provide an attractive alternative illumination scheme for SD-OCT. Yet to date, the use of such soliton micro-combs in OCT has not been demonstrated or considered. Here we explore the use of soliton microcombs in spectral domain OCT. By using photonic chipscale Si3N4 ...

      Read Full Article
    6. EXALOS releases NEW Ultrabroadband Superluminescent Light Emitting Diodes for Medical Imaging and Sensor applications

      EXALOS releases NEW Ultrabroadband Superluminescent Light Emitting Diodes for Medical Imaging and Sensor applications

      EXALOS has expanded its portfolio of Superluminescent Light Emitting Diodes (SLEDs) by introducing our new near-IR Combi-SLED modules where multiple SLED devices are spectrally combined to provide an ultra-broadband spectrum. The light output of the SLEDs are collimated using micro-optical collimation lenses, spectrally combined and colinearly aligned through free-space dielectric edge filters and focused into a single-mode fiber. The Combi-SLEDs are especially suited for medical imaging applications such as ultra-high-resolution Optical Coherence Tomography (UHR-OCT) and Fiber Optic Sensor applications thanks to their high output power. large spectral bandwidth and short coherence length. The first product release of such a Combi-SLED ...

      Read Full Article
      Mentions: Exalos Kevin Hsu
    7. EXALOS Introduces RGB Modules for Augmented Reality and Head-up Display Applications

      EXALOS Introduces RGB Modules for Augmented Reality and Head-up Display Applications

      EXALOS, the world’s leading developer of visible Superluminescent Light Emitting Diodes (SLEDs), has expanded its product porfolio with the introduction of a compact RGB SLED module that will enable the advancement of micro-display architectures for augmented reality (AR) and head-up displays (HUDs). The RGB module constitutes three SLED chips housed in a 14-pin butterfly package (20.8 mm x 1.7 mm) with a total output power of about 30 mW (~ 10 mW/color), which corresponds to a total luminous flux of 5 lm. The individual chips (635 nm (R), 510 nm (G), and 450 nm (B)) are each ...

      Read Full Article
      Mentions: Exalos Kevin Hsu
    8. Noise of supercontinuum sources in spectral domain optical coherence tomography

      Noise of supercontinuum sources in spectral domain optical coherence tomography

      In this paper, we investigate the effect of pulse-to-pulse fluctuations of supercontinuum sources on the noise in spectral domain optical coherence tomography (OCT) images. The commonly quoted theoretical expression for the OCT noise is derived for a thermal light source, which is not suitable if a supercontinuum light source is used. We therefore propose a new, measurement-based OCT noise model that predicts the noise without any assumptions on the type of light source. We show that the predicted noise values are in excellent agreement with the measured values. The spectral correlation evaluated for the photodetected signal when using a supercontinuum ...

      Read Full Article
    9. New U of A laser technology shows promise to treat leading causes of blindness

      New U of A laser technology shows promise to treat leading causes of blindness

      AMD damages the retina of the eye and is the leading cause of blindness globally. Glaucoma is characterized by an increase of pressure within the eye that damages the optic nerve, eventually leading to blindness. It’s projected that by 2020, more than 196 million people will be affected by AMD and 76 million people will be affected by glaucoma. The platform Katchinskiy is developing combines femtosecond lasers with optical coherence tomography, a technology for evaluating conditions of the retina, and scanning laser ophthalmoscopy, a method for creating diagnostic images of the retina that enables a high degree of spatial ...

      Read Full Article
    10. Supercontinuum in the practice of Optical Coherence Tomography with emphasis on noise effects (Thesis)

      Supercontinuum in the practice of Optical Coherence Tomography with emphasis on noise effects (Thesis)

      Optical Coherence Tomography (OCT) is an imaging modality which has proven, since the early 1990s, its incredible potential. Nowadays, numerous fields of medical investigation, such as Ophthalmology, Dermatology or Cardiovascular imaging, would not be the same without the diagnostic tools bring by OCT. This tremendous development has been supported by industry support through improvement of dedicated components such as lasers, cameras and optics. A great example of this development is the evolution of Supercontinuum (SC) sources. Due to the extremely broad spectrum cover by SC sources, their high power density and high spatial coherence, it seems obvious to use them ...

      Read Full Article
    11. Supercontinuum source-based multi-contrast optical coherence tomography for rat retina imaging

      Supercontinuum source-based multi-contrast optical coherence tomography for rat retina imaging

      This study proposed an ultrahigh-resolution multi-contrast optical coherence tomography system integrated with fundus photography for in vivo retinal imaging of rodents. A supercontinuum light source was used in the system, providing an axial resolution of less than 3 µm within 1.8 mm (in the tissue). Three types of tissue contrast based on backscattered intensity, phase retardation, and microvasculature at a capillary level can be simultaneously obtained using the proposed system. Pigmented Long-Evans, non-pigmented (albino) Sprague Dawley, and Royal College of Surgeons rats were imaged and compared. In vivo imaging results were validated with histology.

      Read Full Article
    12. 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
    13. 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
    14. 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
    15. 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
    16. 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
    17. 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
    18. 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
    19. 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
    20. 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
    21. 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
    22. 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
    23. 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
    24. 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
    1-24 of 277 1 2 3 4 ... 10 11 12 »
  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

  3. People in the News

    1. (1 articles) Kevin Hsu
  4. OCT Companies in the News

    1. (1 articles) Exalos