1. Kenneth K. Y. Wong

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    1. Mentioned In 18 Articles

    2. Video-rate centimeter-range optical coherence tomography based on dual optical frequency combs by electro-optic modulators

      Video-rate centimeter-range optical coherence tomography based on dual optical frequency combs by electro-optic modulators
      Imaging speed and range are two important parameters for optical coherence tomography (OCT). A conventional video-rate centimeter-range OCT requires an optical source with hundreds of kHz repetition rate and needs the support of broadband detectors and electronics (1 GHz). In this paper, a type of video-rate centimeter-range OCT system is proposed and demonstrated based on dual optical frequency combs by leveraging electro-optic modulators. The repetition rate difference between dual combs ...
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    3. Point-spread function manipulation of the swept-source optical coherence tomography through temporal phase modulation

      Point-spread function manipulation of the swept-source optical coherence tomography through temporal phase modulation
      Recent breakthroughs in microscopy have surpassed Abbes spatial diffraction limit, especially in the regime of fluorescence imaging. Microcopys depth-imaging relative tomography is, however, still confined to basic imaging quality, which is limited by the Fourier bandwidth. In this paper, we explore the analogy between spatial microscopy and temporal tomography based on the space-time duality, and hence enlighten the advancement of tomography. As a proof-of-principle demonstration, an all-optical manipulation of the ...
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    4. Tri-band optical coherence tomography for lipid and vessel spectroscopic imaging

      Tri-band optical coherence tomography for lipid and vessel spectroscopic imaging
      Optical coherence tomography (OCT) has been utilized for various functional imaging applications. One of its highlights comes from spectroscopic imaging, which can simultaneously obtain both morphologic and spectroscopic information. Assisting diagnosis and therapeutic intervention of coronary artery disease is one of the major directions in spectroscopic OCT applications. Previously Tanaka et al. have developed a spectral domain OCT (SDOCT) to image lipid distribution within blood vessel [1]. In the meantime ...
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    5. Tri-band spectroscopic optical coherence tomography based on optical parametric amplification for lipid and vessel visualization

      Tri-band spectroscopic optical coherence tomography based on optical parametric amplification for lipid and vessel visualization
      A tri-band spectroscopic optical coherence tomography (SOCT) system has been implemented for visualization of lipid and blood vessel distribution. The tri-band swept source, which covers output spectrum in 1.3, 1.5, and 1.6 m wavelength windows, is based on a dual-band Fourier domain mode-locked laser and a fiber optical parametric amplifier. This tri-band SOCT can further differentiate materials, e.g., lipid and artery, qualitatively by contrasting attenuation coefficients ...
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    6. 28 MHz swept source at 1.0 μm for ultrafast quantitative phase imaging

      28 MHz swept source at 1.0 μm for ultrafast quantitative phase imaging
      Emerging high-throughput optical imaging modalities, in particular those providing phase information, necessitate a demanding speed regime (e.g. megahertz sweep rate) for those conventional swept sources; while an effective solution is yet to be demonstrated. We demonstrate a stable breathing laser as inertia-free swept source (BLISS) operating at a wavelength sweep rate of 28 MHz, particularly for the ultrafast interferometric imaging modality at 1.0 m. Leveraging a tunable dispersion ...
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    7. Simultaneous dual-band optical coherence tomography for endoscopic applications

      Simultaneous dual-band optical coherence tomography for endoscopic applications
      Dual-band optical coherence tomography (OCT) can greatly enhance the imaging contrast with potential applications in functional (spectroscopic) analysis. A new simultaneous dual-band Fourier domain mode-locked swept laser configuration for dual-band OCT is reported. It was based on a custom-designed dual-channel driver to synchronize two different wavelength bands at 1310 and 1550 nm, respectively. Two lasing wavelengths were swept simultaneously from 1260 to 1364.8 nm for the 1310-nm band and ...
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    8. Feature Of The Week 3/16/14: The University of Hong Kong Demonstrates MHz A-Line SS-OCT via Optical Time Stretching and Raman Amplification of Pulsed Source

      Feature Of The Week 3/16/14: The University of Hong Kong Demonstrates MHz A-Line SS-OCT via Optical Time Stretching and Raman Amplification of Pulsed Source
      We demonstrate all-optical ultrahigh-speed swept-source optical coherence tomography (OCT) based on amplified optical time-stretch (AOT). Such an inertia-free wavelength-swept mechanism, via group velocity dispersion, enables us to realize OCT with an A-scan rate well above MHz. More importantly, the key significance of AOT-OCT is its simultaneous broadband Raman amplification during the time-stretch processgreatly enhancing the detection sensitivity compared with prior attempts to apply optical time-stretch to OCT. Here, we report ...
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    9. Wavelet domain compounding for speckle reduction in optical coherence tomography

      Wavelet domain compounding for speckle reduction in optical coherence tomography
      Visibility of optical coherence tomography (OCT) images can be severely degraded by speckle noise. A computationally efficient despeckling approach that strongly reduces the speckle noise is reported. It is based on discrete wavelet transform (DWT), but eliminates the conventional process of threshold estimation. By decomposing an image into different levels, a set of sub-band images are generated, where speckle noise is additive. These sub-band images can be compounded to suppress ...
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    10. 1-15 of 18 1 2 »
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  2. About Kenneth K. Y. Wong

    Kenneth K. Y. Wong

    Kenneth Wong is an Associate Professor in Photonic Systems Research Laboratory part of the Department of Electrical and Electronic Engineering at The University of Hong Kong,