1. Articles from Marcus Duelk

    1-6 of 6
    1. Ultra-high-resolution SD-OCM imaging with a compact polarization-aligned 840 nm broadband combined-SLED source

      Ultra-high-resolution SD-OCM imaging with a compact polarization-aligned 840 nm broadband combined-SLED source

      We analyze the influence of intrinsic polarization alignment on image quality and axial resolution employing a broadband 840 nm light source with an optical bandwidth of 160 nm and an output power of 12 mW tailored for spectral-domain optical coherence microscopy (SD-OCM) applications. Three superluminescent diodes (SLEDs) are integrated into a 14-pin butterfly module using a free-space micro-optical bench architecture, maintaining a constant polarization state across the full spectral output. We demonstrate superior imaging performance in comparison to traditionally coupled-SLED broadband light sources in a teleost model organism in-vivo .

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    2. Diagnostics/Optical Coherence Tomography: Light source calibration for accurate depth readings from FD-OCT

      Diagnostics/Optical Coherence Tomography: Light source calibration for accurate depth readings from FD-OCT

      Producing accurate depth information with Fourier-domain optical coherence tomography (FD-OCT) depends on proper light source calibration; there are different considerations for nonlinear sampling in the two primary FD-OCT implementations: spectral-domain (SD-OCT) and swept-source (SS-OCT). Fourier-domain optical coherence tomography (FD-OCT) is a coherence gating technique. It acquires, as a function of optical wavenumber, the interferometric signal generated by mixing backscattered light from the sample with reference light at a fixed group delay. Back-reflection or backscattered light from samples at different delays generates oscillations or fringes in the interference spectrum. Increased delay produces higher oscillation frequency in the interference spectrum. It is ...

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      Mentions: Exalos
    3. 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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      Mentions: Exalos
    4. 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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    5. 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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      Mentions: Exalos
    6. 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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    1-6 of 6
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    1. (6 articles) Exalos
    2. (1 articles) Kyushu University
    3. (1 articles) Medical University of Vienna
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    5. (1 articles) National Institutes of Health
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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 Diagnostics/Optical Coherence Tomography: Light source calibration for accurate depth readings from FD-OCT Ultra-high-resolution SD-OCM imaging with a compact polarization-aligned 840 nm broadband combined-SLED source The Structural and Comparative Analysis of Intravitreal Dexamethasone Implant (Ozurdex) and Anti-VEGF Injection in Branched Retinal Vein Occlusion Patients by Optical Coherence Tomography Angiography Images Quantitation Vascular Responses to First-Generation Sirolimus-Eluting Stents and Bare-Metal Stents Beyond 10 Years Ocular Parameters Evaluation in Relation to the Refractive Error using Optical Coherence Topography Micro Optical Coherence Tomography for Coronary Imaging Macular Vessel Density in Diabetic Retinopathy Patients: How Can We Accurately Measure and What Can It Tell Us? Systems and methods for long working distance optical coherence tomography (OCT)