Prof. Won-Taek Han Profile

Prof. Won-Taek Han

at Gwangju Institute of Science and Technology

SPIE Involvement:

Author

Publications (19)

SPIE Journal Paper | 8 February 2023

Effect of incident light beam conditions on firing characteristics of the radial-firing optical fiber tip

Yong-Tak Ryu, Seongmin Ju, Bok Hyeon Kim, Youngjoo Chung, Won-Taek Han

OE, Vol. 62, Issue 02, 026104, (February 2023) https://doi.org/10.1117/12.10.1117/1.OE.62.2.026104

KEYWORDS: Optical simulations, Optical fibers, Incident light, Beam diameter, Optical engineering, Gaussian beams, Sodium, Cladding, Beam propagation method, Structured optical fibers

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Proceedings Article | 3 October 2022 Presentation + Paper

Germano-borate glasses containing high Dy3+ ion concentrations for Faraday device applications at 1550 nm

Linganna Kadathala, Ryu Yongtak, Khurram Naeem, Seongmin Ju, Won-Taek Han, Bok Hyeon Kim

Proceedings Volume 12229, 122290C (2022) https://doi.org/10.1117/12.2642924

KEYWORDS: Glasses, Dysprosium, Ions, Magneto-optics, Near infrared, Optical properties, Thermal analysis

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SPIE Journal Paper | 18 March 2021

Fabrication and optical characteristics of large-core radial-firing optical fiber tip comprised of conically shaped air-pocket

Yong-Tak Ryu, Seongmin Ju, Yuseung Lee, Seokhun Lee, Won-Taek Han

OE, Vol. 60, Issue 03, 036107, (March 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.3.036107

KEYWORDS: Optical fibers, Optical simulations, Optical engineering, Sodium, Surgery, Refractive index, Fiber lasers, Tissues, Interfaces, Cladding

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Proceedings Article | 23 April 2017 Paper

A novel photonic crystal fiber with a germanium nanoparticles-doped germano-silicate core and its nonlinear optical characteristics

Seongmook Jeong, Seongmin Ju, Yuseung Lee, Youngwoong Kim, In-Sik Kim, Do-Kyeong Ko, Won-Taek Han

Proceedings Volume 10323, 103234L (2017) https://doi.org/10.1117/12.2265779

KEYWORDS: Glasses, Absorption, Optical fibers, Refractive index, Femtosecond phenomena, Photonic crystal fibers, Germanium, Nanoparticles, Nonlinear optics, Supercontinuum generation

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Proceedings Article | 23 April 2017 Paper

Effect of F doping in the core of a birefringent photonic crystal fiber on sensing capability of temperature and strain sensors

Youngmin Kim, Seongmin Ju, Seongmook Jeong, Seung Ho Lee, Youngwoong Kim, Won-Taek Han

Proceedings Volume 10323, 1032349 (2017) https://doi.org/10.1117/12.2265539

KEYWORDS: Optical fibers, Silica, Photoelasticity, Glasses, Sensors, Fluorine, Photonic crystal fibers, Doping, Birefringence, Temperature metrology

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Proceedings Article | 20 May 2013 Paper

Optical fiber bend sensor based on fiber Bragg grating in germano-silicate glass optical fiber with depressed-index structure

Seongmin Ju, Seongmook Jeong, Youngwoong Kim, Myoung-Jin Jang, Onyu Kim, Won-Taek Han

Proceedings Volume 8794, 87942G (2013) https://doi.org/10.1117/12.2026781

KEYWORDS: Fiber Bragg gratings, Optical fibers, Sensors, Glasses, Cladding, Structured optical fibers, Refractive index, Single mode fibers, Fiber optics sensors, Hydrogen

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Proceedings Article | 20 May 2013 Paper

Radiation-induced optical attenuation of Co/Fe co-doped alumino-silicate optical fiber for radiation dosimeter application

Youngwoong Kim, Seongmin Ju, Seongmook Jeong, Jong-Yeol Kim, Nam-Ho Lee, Hyun-Kyu Jung, Won-Taek Han

Proceedings Volume 8794, 87941A (2013) https://doi.org/10.1117/12.2025983

KEYWORDS: Optical fibers, Absorption, Signal attenuation, Single mode fibers, Gamma radiation, Ions, Optical testing, Glasses, Light sources, Metals

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Proceedings Article | 26 August 2008 Paper

Recent progress in development and nonlinear optical device application of optical fibers incorporated with noble metal nanoparticles

Aoxiang Lin, Won-Taek Han

Proceedings Volume 7095, 70950G (2008) https://doi.org/10.1117/12.794288

KEYWORDS: Optical fibers, Absorption, Nonlinear optics, Metals, Gold, Optical limiting, Nanoparticles, Silver, Doping, Optical communications

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Proceedings Article | 16 May 2008 Paper

Simultaneous measurement for temperature and strain by use of Sagnac interferometer with controlled sensitivity

Guoyong Sun, Dae Seung Moon, Aoxiang Lin, Won-Taek Han, Youngjoo Chung

Proceedings Volume 7004, 70041Y (2008) https://doi.org/10.1117/12.785896

KEYWORDS: Sagnac interferometers, Optical fibers, Temperature metrology, Head, Fiber optics sensors, Birefringence, Polarization, Mirrors, Sun, Fiber Bragg gratings

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SPIE Journal Paper | 1 August 2007

Au-nanoparticle-incorporated germano-silicate glass fiber with high resonant nonlinearity

Aoxiang Lin, Won-Taek Han

JNP, Vol. 1, Issue 01, 013554, (August 2007) https://doi.org/10.1117/12.10.1117/1.2784110

KEYWORDS: Gold, Absorption, Glasses, Electrons, Nanoparticles, Nonlinear optics, Metals, Dielectrics, Doping, Aluminum

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Proceedings Article | 9 February 2007 Paper

Fabrication and third-order nonlinearity of germano-silicate glass fiber incorporated with Au nanoparticles

Aoxiang Lin, Bok Hyeon Kim, Seongmin Ju, Won-Taek Han

Proceedings Volume 6481, 64810M (2007) https://doi.org/10.1117/12.700574

KEYWORDS: Gold, Glasses, Absorption, Nanoparticles, Electrons, Nonlinear optics, Aluminum, Dielectrics, Doping, Metals

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Proceedings Article | 7 February 2007 Paper

A simple analytical model to determine gain in 1064-nm pumped Tm-doped 1470-nm amplifier

Pramod Watekar, Seongmin Ju, Won-Taek Han

Proceedings Volume 6468, 64680W (2007) https://doi.org/10.1117/12.700670

KEYWORDS: Glasses, Optical fibers, Silica, Argon, Fluorine, Optical amplifiers, Fiber amplifiers, Absorption, Picosecond phenomena, Signal attenuation

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Proceedings Article | 28 February 2006 Paper

Measurements of non-elastic frozen-in residual stress near the cleaved end of an optical fiber by the inverse linear polarizing method

In Hee Shin, Bok-Hyeon Kim, Won-Teak Han, Dug Young Kim

Proceedings Volume 6116, 61160U (2006) https://doi.org/10.1117/12.645677

KEYWORDS: Optical fibers, Refractive index, Polarizers, Phase shifts, Photoelasticity, Polarization, CCD cameras, Statistical analysis, Light, Birefringence

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Proceedings Article | 25 June 2002 Paper

Temperature dependent chromatic dispersion measurement using long-period fiber grating

Young-Jae Kim, EunSeo Choi, Youngjoo Chung, Won-Taek Han, Un-Chul Paek, Byeong Ha Lee

Proceedings Volume 4639, (2002) https://doi.org/10.1117/12.481331

KEYWORDS: Cladding, Dispersion, Refractive index, Temperature metrology, Germanium, Silica, Optical fibers, Single mode fibers, Doping, Waveguides

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Proceedings Article | 25 April 2002 Paper

Optical properties measurement of several photonic crystal fibers

Joo Eom, Kun Park, Youngjoo Chung, Won-Taek Han, Un-Chul Paek, Dug Kim, Byeong Ha Lee

Proceedings Volume 4655, (2002) https://doi.org/10.1117/12.463867

KEYWORDS: Photonic crystal fibers, Optical fibers, Silica, Optical testing, Optical properties, Capillaries, Cladding, Light sources, Objectives, Cameras

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Proceedings Article | 19 October 2001 Paper

Measurement of refractive index change due to CO2 laser irradiation using an LPG pair in optical fibers

Bokhyeon Kim, Tae-Jung Ahn, Y. Park, D.Y. Kim, Byeong Ha Lee, Youngjoo Chung, Un-Chul Paek, Won-Taek Han

Proceedings Volume 4579, (2001) https://doi.org/10.1117/12.444907

KEYWORDS: Gas lasers, Carbon monoxide, Laser irradiation, Refractive index, Optical fibers, Cladding, Fiber lasers, Carbon dioxide lasers, Ultraviolet radiation, Glasses

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Proceedings Article | 19 October 2001 Paper

Torsion sensing characteristics of optical fiber with a long-period grating pair

Tae-Jung Ahn, B.H. Kim, Byeong Ha Lee, Youngjoo Chung, Un-Chul Paek, Won-Taek Han

Proceedings Volume 4579, (2001) https://doi.org/10.1117/12.444882

KEYWORDS: Optical fibers, Polarization, Polarizers, Sensors, Ultraviolet radiation, Optical sensing, Birefringence, Refractive index, Gas lasers, Glasses

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