1. Chang-Seok Kim

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    1. Mentioned In 24 Articles

    2. Akinetic swept-source optical coherence tomography based on a pulse-modulated active mode locking fiber laser for human retinal imaging

      Akinetic swept-source optical coherence tomography based on a pulse-modulated active mode locking fiber laser for human retinal imaging
      Optical coherence tomography (OCT) is a noninvasive imaging modality that can provide high-resolution, cross-sectional images of tissues. Especially in retinal imaging, OCT has become one of the most valuable imaging tools for diagnosing eye diseases. Considering the scattering and absorption properties of the eye, the 1000-nm OCT system is preferred for retinal imaging. In this study, we describe the use of an akinetic swept-source OCT system based on a pulse-modulated ...
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    3. Unfolding displacement measurement method for the aliasing interferometer signal of a wavelength-comb-swept laser

      Unfolding displacement measurement method for the aliasing interferometer signal of a wavelength-comb-swept laser
      We demonstrate an unfolding displacement measurement method to overcome the aliasing problem of wavelength-comb-swept laser (WCSL). Compared to the conventional wavelength-swept laser (WSL), the WCSL exhibits an extended coherence length, owing to the narrowing spectral linewidth of the etalon filter. However, the aliasing interference signal induces an unexpected back-bounced phenomenon during displacement measurement because of the discretely distributed comb-like periodic spectra of the etalon filter. By using the dual-reference interferometry ...
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    4. Optical measurements of paintings and the creation of an artwork database for authenticity

      Optical measurements of paintings and the creation of an artwork database for authenticity
      Paintings have high cultural and commercial value, so that needs to be preserved. Many techniques have been attempted to analyze properties of paintings, including X-ray analysis and optical coherence tomography (OCT) methods, and enable conservation of paintings from forgeries. In this paper, we suggest a simple and accurate optical analysis system to protect them from counterfeit which is comprised of fiber optics reflectance spectroscopy (FORS) and line laser-based topographic analysis ...
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    5. Optical Coherence Tomography (OCT) Device For Processing THREE-DIMENSIONAL OCT Data

      Optical Coherence Tomography (OCT) Device For Processing THREE-DIMENSIONAL OCT Data
      The purpose of the present invention is to increase the data processing speed in an SS-OCT and an FD-OCT including the SS-OCT and, in particular, to process large-size data obtained by a receiving unit at a faster speed than the data obtaining speed, reconfigure a tomography image in real time, and provide the reconfigured image to a user. In order to achieve the purpose, according to one embodiment of the ...
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    6. Simultaneous Dual-Band Wavelength-Swept Fiber Laser Based on Active Mode Locking

      Simultaneous Dual-Band Wavelength-Swept Fiber Laser Based on Active Mode Locking
      We report a simultaneous dual-band wavelength-swept laser based on the active mode locking method. By applying a single modulation signal, synchronized sweeping of two lasing-wavelengths is demonstrated without the use of a mechanical wavelength-selecting filter. Two free spectral ranges are independently controlled with a dual path-length configuration of a laser cavity. The static and dynamic performances of a dual-band wavelength-swept active mode locking fiber laser are characterized in both the ...
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    7. Optical coherence tomographic findings of crystal deposits in the lens and cornea in Bietti crystalline corneoretinopathy associated with mutation in the CYP4V2 gene

      Optical coherence tomographic findings of crystal deposits in the lens and cornea in Bietti crystalline corneoretinopathy associated with mutation in the CYP4V2 gene
      Background We report the optical coherence tomography (OCT) findings of crystalline deposits in the cornea and lens of a patient with Bietti crystalline dystrophy (BCD), thus providing evidence for a better understanding of the pathophysiology of BCD. Patient A 49-year-old man showing typical chorioretinal degeneration with a CYP4V2 mutation was diagnosed with BCD. Observations The anterior segment OCT images clearly showed flat hyperreflective plaques just beneath the corneal epithelium and ...
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    8. Optical sensor interrogation system based on FDML wavelength swept laser

      Optical sensor interrogation system based on FDML wavelength swept laser
      Provided is an optical sensor interrogation system. The optical sensor interrogation system includes: a light source unit which matches round-trip time of light and wavelength tunable cycle time of light in a resonator and emits light; a sensing unit which receives an optical signal in which a center wavelength periodically tunes, from the light source unit and tunes the center wavelength of the optical signal according to physical changes applied ...
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    9. Spectrally Sampled OCT Imaging Based on 1.7um Continuous-Wave Supercontinuum Source

      Spectrally Sampled OCT Imaging Based on 1.7um Continuous-Wave Supercontinuum Source
      We demonstrate a novel multiwavelength light source around the 1.7um region based on continuous-wave (CW) supercontinuum (SC) generation for the deeper imaging of low-water-absorption sample with a spectrally sampled optical coherence tomography (OCT) system. This self-regulated Gaussian spectrum of CW SC source has an extremely smooth flat width with more than 210-nm full-width at half-maximum bandwidth centered at the 1.7um region, a high output power of 500 mW ...
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    10. Optical Coherence Tomography Using Active Mode-Locking Fiber Laser

      Optical Coherence Tomography Using Active Mode-Locking Fiber Laser
      An optical coherence tomography (OCT) uses an active mode-locking fiber laser in order to obtain image information of a sample. An imaging device of the present invention comprises: a light source unit that emits light having a central wavelength which is periodically changed by a modulation signal received from the inside of a resonator; a light separation unit that separates the light having a single path, which is emitted from ...
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    11. 1-15 of 24 1 2 »
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  2. About Chang-Seok Kim

    Chang-Seok Kim

    Chang-Seok Kim is with the Department of Cogno Mechatronics Engineering, World Class University Program, Pusan National University in South Korea.