1. Articles from Lawrence R. Chen

    1-3 of 3
    1. Developing dual core ytterbium doped fiber ring laser in Fourier domain mode locked operation for swept-source optical coherence tomography

      Developing dual core ytterbium doped fiber ring laser in Fourier domain mode locked operation for swept-source optical coherence tomography
      We demonstrate high efficiency and wide bandwidth gain in a Ytterbium doped fiber amplifier. The highpowered amplifier has potential applications for use with a swept-source fiber ring laser in multi-channel optical coherence tomography (OCT) system. The ring cavity design includes a 976nm pumped dual core Yb doped fiber as the gain medium, where a rotating polygon mirror is used as a wavelength-sweeping filter for this source. The amplified spontaneous emission (ASE) had a spectral bandwidth of 1037-1145nm at -60dBm, where a tunable lasing bandwidth of the ring cavity ranged from 1057-1115nm. The highest output power, for both the ASE and ...
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    2. Cascaded Raman fiber laser in Fourier domain mode lock operation

      Cascaded Raman fiber laser in Fourier domain mode lock operation
      In this study, a cascaded Raman fiber laser in Fourier domain mode lock operation (FDML) is presented. This laser utilizes a Ytterbium doped twin core pump laser source at 1109 nm. The pump light is directed to a cascaded Raman cavity, which consists of multiple cascaded fiber Bragg grating pairs and 3.86 km of dispersion compensation fiber, which provides Raman gain. The output wavelength of a cascaded Raman laser is determined by the Stoke’s shift (≈ 60 to 70 nm in optical fiber) and the pump laser wavelength. The power build up in the cascaded Raman cavity and shift ...
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    3. Development of Broadband Sources Based on Semiconductor Optical Amplifiers and Erbium-Doped Fiber Amplifiers for Optical Coherence Tomography

      Development of Broadband Sources Based on Semiconductor Optical Amplifiers and Erbium-Doped Fiber Amplifiers for Optical Coherence Tomography
      Broadband sources (BBSs) are commonly used in a wide range of applications in optical communication systems and biophotonics. They are particularly useful tools for biomedical imaging techniques such as optical coherence tomography (OCT). In order to obtain high image quality, we have developed a novel, low-cost, BBS based on semiconductor optical amplifiers combined with an erbium-doped fiber amplifier. It has bandwidth (BW) between 100 and 150 nm (ranging from 1450 to 1630 nm) and output power between 4 and 9 mW. Several configurations optimizing the BW, the spectral shape, and the output power are compared and tested in a time-domain ...
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    1-3 of 3
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  2. Topics in the News

    1. (2 articles) Sunnybrook Health Sciences Centre
    2. (2 articles) Ryerson University
    3. (2 articles) University of Hong Kong
    4. (2 articles) University of Toronto
    5. (1 articles) Polytechnique Montreal
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    Development of Broadband Sources Based on Semiconductor Optical Amplifiers and Erbium-Doped Fiber Amplifiers for Optical Coherence Tomography Developing dual core ytterbium doped fiber ring laser in Fourier domain mode locked operation for swept-source optical coherence tomography Cascaded Raman fiber laser in Fourier domain mode lock operation Normative data and associations of Optical Coherence Tomography Angiography measurements of the macula: The Singapore Malay Eye Study Automatic Segmentation and Measurement of Choroid Layer in High Myopia for OCT Imaging Using Deep Learning In-process monitoring in laser grooving with line-shaped femtosecond pulses using optical coherence tomography Three-dimensional opto-thermo-mechanical model for predicting photo-thermal optical coherence tomography responses in multilayer geometries The role of optical coherence tomography angiography in moderate and advanced primary open-angle glaucoma OCT-angiography follow-up of choroidal neovascularization treated with treat- and- extend aflibercept regimen to avoid over-treatment A Review of Spectroscopic and Non-Spectroscopic Techniques for Diagnosing Breast Cancer Collaboration Between Seno Medical and Cogmedix Drives GOLDEN Results for Innovative Medical Breast Imaging System Prediction of Retinal Ganglion Cell Counts Considering Various Displacement Methods From OCT-Derived Ganglion Cell-Inner Plexiform Layer Thickness