1. Articles from Christian Velez

    1-5 of 5
    1. 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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    2. Light source, and optical coherence tomography module

      Light source, and optical coherence tomography module

      An optical module includes a light source. The light source can be a swept wavelength light source, and optical module includes a wavemeter. The wavemeter includes a wavemeter tap capable of directing a wavemeter portion of light produced by the light source away from a main beam, a wavelength selective filter arranged to receive the wavemeter portion, a first wavemeter detector arranged to measure a transmitted radiation intensity of radiation transmitted through the filter, and a second wavemeter detector arranged to measure a non-transmitted radiation intensity of radiation not transmitted through but reflected by the filter. In addition, an optical ...

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    3. Thermal resistance reduction in high power superluminescent diodes by using active multi-mode interferometer

      Thermal resistance reduction in high power superluminescent diodes by using active multi-mode interferometer

      Low thermal resistance of high power superluminescent diodes (SLEDs) by using active multi-mode interferometer (active-MMI) is presented in this paper. The active layer temperature evaluation demonstrates that the power saturation mechanism in active-MMI SLED is heat for the first time. Low thermal resistance of 4.83 K/W in active-MMI SLEDs leads to a high power of 115 mW. Moreover, the effect of the active area size on the output power is demonstrated both experimentally and theoretically. Good agreement between the theoretical and experimental results indicates that active-MMI configuration is a new design in support of efficient heat dissipation and ...

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    4. Light Source, And Optical Coherence Tomography Module (Wo 2010/111795)

      Light Source, And Optical Coherence Tomography Module (Wo 2010/111795)

      According to an aspect of the invention, a swept wavelength light source is provided, the light source comprising: - a semiconductor gain device operable to provide amplification, - an optical retarding device, the retarding device comprising a block of material, a beam path with a well-defined beam path length being defined for light within the block of material produced by the gain device, - a wavelength selector, and - the gain device, the retarding device and wavelength selector being mutually arranged on the base so that a resonator is established for light portions emitted by the gain device and selected by wavelength selector; this ...

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    5. High Power Blue-Violet Superluminescent Light Emitting Diodes with InGaN Quantum Wells

      High Power Blue-Violet Superluminescent Light Emitting Diodes with InGaN Quantum Wells

      We report on the characteristics of blue superluminescent light emitting diodes based on the emission of InGaN quantum wells. Narrow ridge-waveguide devices realized by standard processing techniques and with extremely low facet reflectivity show single lateral mode emission and continuous-wave output powers >35 mW with a typical spectral bandwidth of 4–5 nm. Tuning the composition of the active region, superluminescent light emitting diodes spanning all the spectral range between 410 and 445 nm could be realized. The light output is highly directional and results in a coupling efficiency into single mode fibers >50%. The device temperature behavior is also ...

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    1-5 of 5
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    1. (5 articles) Exalos
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    High Power Blue-Violet Superluminescent Light Emitting Diodes with InGaN Quantum Wells Light Source, And Optical Coherence Tomography Module (Wo 2010/111795) Thermal resistance reduction in high power superluminescent diodes by using active multi-mode interferometer Light source, and optical coherence tomography module Superluminescent LEDs Bridge the Gap Postdoctoral Associate Position at Duke Vision and Image Processing Laborator Anterior segment optical coherence tomography angiography Refining percutaneous coronary intervention: intracoronary imaging, haemodynamics, P2Y12 antagonists, and public outcomes reporting Optical Coherence Tomography/Fluorescence Imaging: Fiber assembly enables efficient multimodal endoscopy Optical Fabrication: Glassblowing technique creates arrays of axicon lenses University of Alabama Receives NIH Grant  for Clinical and Translational Core. University of Alabama Receives NIH Grant for Cell Model Evaluation Core.