1. Articles from Hae Young Choi

    1-9 of 9
    1. A fiber-based single-unit dual-mode optical Imaging system: Swept source optical coherence tomography and fluorescence spectroscopy

      A fiber-based single-unit dual-mode optical Imaging system: Swept source optical coherence tomography and fluorescence spectroscopy
      We propose a fiber optic single-unit but dual-mode optical imaging system that can provide fast cross-sectional imaging capabilities of swept-source optical coherence tomography (SS-OCT) and functional capabilities of fluorescence spectroscopy (FS). By adopting a fiber optic FS system into a fiber-based SS-OCT system, a compact and effective multimodal single-unit SSOCT-FS system could be achieved. Here, the key element of the proposed multimodal imaging system is a specially designed fiber coupler based on double-clad fiber (DCF), which has only cladding-mode coupling capability. The DCF couplers were fabricated with home-drawn DCF by several fabrication methods; a twisting method, a side-polishing method and ...
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    2. Ultrawideband photonic crystal fiber coupler for multiband optical imaging system

      Ultrawideband photonic crystal fiber coupler for multiband optical imaging system
      We report a photonic crystal fiber (PCF) coupler having an ultrawide spectral bandwidth keeping single mode operation. The use of the PCF coupler in a fiber-based optical coherence tomography (OCT) system enables us to handle the wide spectral bands of various light sources, including superluminescent diodes (SLDs) at 1300 nm and 820 nm, Ti:sapphire lasers, and white-light sources. The multiband imaging performances of the PCF-based OCT system are demonstrated by obtaining dental images at 1300 nm and 820 nm with the same setup. In addition, we show that the PCF coupler could cover the spectrum over a one octave ...
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    3. Thickness and index measurements of a transparent specimen by full-field optical coherence microscopy

      We present the method measuring the thickness and the refractive index of a transparent specimen at a same time based on full-field optical coherence tomography. As a sample a small drop of epoxy was placed on a flat plate and the high-resolution depth resolved en-face images of the epoxy drop were taken. With adopting the plate surface as a reference plane, the physical thickness and the refractive index distribution could be obtained. Owing to the full-field imaging capability, we could obtain the transverse distributions of the thickness and the refractive index without any transverse scanning. The measured thickness at the ...
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    4. Simultaneous measurements of optical coherence tomography and fluorescence spectroscopy based on double clad fiber

      We report an all-fiber system aided by double-clad fiber (DCF) and DCF devices for simultaneous measurements of optical coherence tomography (OCT) and fluorescence spectroscopy (FS). The DCF together with DCF coupler and single-body DCF lens helped in realizing a ultifunctional single-unit probe fo ... [Proc. SPIE 7171, 71710T (2009)] published Fri Feb 20, 2009.
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    5. Combined system of optical coherence tomography and fluorescence spectroscopy based on double-cladding fiber

      We report the development of an all-fiber multimodal system, based on a double-cladding fiber (DCF) and related devices, suitable for simultaneous measurements of optical coherence tomography (OCT) and fluorescence spectroscopy (FS). The DCF together with a DCF coupler and a single-body DCF lens ... [Opt. Lett. 33, 2347-2349 (2008)]
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    6. Lensed fiber probes designed as an alternative to bulk probes in optical coherence tomography

      We demonstrate a compact all-fiber sampling probe for an optical coherence tomography (OCT) system. By forming a focusing lens directly on the tip of an optical fiber, a compact sampling probe could be implemented. To simultaneously achieve a sufficiently long working distance and a good lateral ... [Appl. Opt. 47, 1510-1516 (2008)]
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    7. All-fiber probe for optical coherence tomography

      Seon Young Ryu, Hae Young Choi, Jihoon Na et al. We propose an all-fiber probe for the sample arm of an optical coherence tomography (OCT) system. By forming a focusing lens directly on the tip of an optical fiber, a compact sample probe could be implemented. To achieve a long enough working distance and a high enough lateral resolution at the sam ... [Proc. SPIE Int. Soc. Opt. Eng. 6847, 68472L (2008)] published Mon Feb 18, 2008.
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    8. Single-body lensed photonic crystal fibers as side-viewing probes for optical imaging systems.

      We report the fabrication and performance of a lensed photonic crystal fiber (PCF) designed as a compact but effective side-viewing optical imaging probe. The lensed-PCF probe was implemented in a single body without using any other fibers or additional optics. The beam expansion region and a focusing ball lens, necessary for a focuser, were simultaneously formed along a small piece of PCF by applying arc discharges. The side-viewing ability was provided by polishing the ball lens with a femtosecond laser to form a total internal reflection surface. The working distance and the transverse resolution of the fabricated single-body lensed-PCF were ...
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    9. Single-body lensed photonic crystal fibers as side-viewing probes for optical imaging systems

      We report the fabrication and performance of a lensed photonic crystal fiber (PCF) designed as a compact but effective side-viewing optical imaging probe. The lensed-PCF probe was implemented in a single body without using any other fibers or additional optics. The beam expansion region and a ... [Opt. Lett. 33, 34-36 (2008)]
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    1-9 of 9
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  2. Topics in the News

    1. (9 articles) Gwangju Institute of Science and Technology
    2. (4 articles) Woo June Choi
    3. (2 articles) Duke University
    4. (1 articles) UC Irvine
    5. (1 articles) Konyang University
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    Ultrawideband photonic crystal fiber coupler for multiband optical imaging system A fiber-based single-unit dual-mode optical Imaging system: Swept source optical coherence tomography and fluorescence spectroscopy Repeatability of Optical Coherence Tomography Angiography Measurements in Patients with Retinal Vein Occlusion Retinal Vascularization Analysis on Optical Coherence Tomography Angiography before and after Intraretinal or Subretinal Fluid Resorption in Exudative Age-Related Macular Degeneration: A Pilot Study Anterior‐segment optical coherence tomography of filtering blebs in the early postoperative period of ab externo SIBS microshunt implantation with mitomycin C: Morphological analysis and correlation with intraocular pressure reduction Combining artificial intelligence and robotics: a novel fully automated optical coherence tomography-based approach for eye disease screening Impact of fundus pigmentation on retinal layer visibility on investigational bedside optical coherence tomography in preterm infants Vascular morphology in facial solar lentigo assessed by optical coherence tomography angiography Macular vascular changes in pregnant women with gestational diabetes mellitus by optical coherence tomography angiography Feasibility of peripheral OCT imaging using a novel integrated SLO ultra-widefield imaging swept-source OCT device The role of optical coherence tomography in the diagnosis of afferent visual pathway problems: A neuroophthalmic perspective (Book Chapter) 'Y' split of the outer plexiform layer: an optical coherence tomography illusion!