Mr. Yoonchan Jeong Profile

Yoonchan Jeong

at Seoul National University

SPIE Involvement:

Author

Publications (32)

Proceedings Article | 4 October 2023 Poster + Paper

End-to-end optimization of meta-lens doublet for high-quality wide-angle imaging

Yeongmyeong Park, Byoungho Lee, Yoonchan Jeong

Proceedings Volume 12646, 126460D (2023) https://doi.org/10.1117/12.2677367

KEYWORDS: Monochromatic aberrations, Image restoration, Point spread functions, Imaging systems, Engineering

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Proceedings Article | 15 March 2023 Presentation + Paper

Meta-optic miniaturized telephoto lens system

Youngjin Kim, Changhyun Kim, Yoonchan Jeong, Byoungho Lee

Proceedings Volume 12432, 1243207 (2023) https://doi.org/10.1117/12.2649578

KEYWORDS: Miniaturization, Glasses, Imaging systems, Total internal reflection, Modulation transfer functions, Reflection, Design and modelling, Point spread functions, Optical components, Gold

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Proceedings Article | 15 March 2023 Poster + Paper

Polarization-independent VO2 metagrating for broadband optical transmittance modulation

Kyuho Kim, Taewon Choi, Sun-Je Kim, Yoonchan Jeong, Byoungho Lee

Proceedings Volume 12431, 124310G (2023) https://doi.org/10.1117/12.2650121

KEYWORDS: Transmittance, Modulation, Phase shift keying, Waveguides, Nanophotonics, Refractive index, Optical components, Incident light, Active optics, Absorption

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Proceedings Article | 14 March 2023 Poster + Paper

Three-dimensional projection from multi-layered light field

Youngjin Jo, Dongheon Yoo, Yoonchan Joeng, Byoungho Lee

Proceedings Volume 12444, 124440B (2023) https://doi.org/10.1117/12.2649569

KEYWORDS: Projection systems, 3D image processing, Microlens array, 3D projection, Integral imaging, 3D displays, Displays, Prototyping, Lens arrays, Multilayers

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Proceedings Article | 14 March 2023 Poster + Paper

Fast deep-trained transformation technique for computer-generated holograms

Juhyun Lee, Yoonchan Jeong, Byoungho Lee

Proceedings Volume 12443, 124430H (2023) https://doi.org/10.1117/12.2649721

KEYWORDS: Computer generated holography, Holographic displays, Spatial light modulators, Numerical simulations, Neural networks, Holograms, Deep learning

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Proceedings Article | 14 March 2023 Poster + Paper

Implementation of varifocal occlusion using lens arrays and focus-tunable lenses

Minseok Chae, Jehyeon Shin, Youngjin Jo, Yoonchan Jeong, Byoungho Lee

Proceedings Volume 12443, 124430G (2023) https://doi.org/10.1117/12.2649558

KEYWORDS: Lens arrays, LCDs, Augmented reality, Eye, Image sharpness, Near eye displays, Polarizers, Imaging systems, Geometrical optics, Virtual reality

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Proceedings Article | 5 March 2021 Presentation

Modeling Er/Yb fiber laser behaviors at high powers

Liang Dong, Turghun Matniyaz, Monica Kalichevsky-Dong, Johan Nilsson, Yoonchan Jeong

Proceedings Volume 11665, 116650N (2021) https://doi.org/10.1117/12.2573792

KEYWORDS: Fiber lasers, Ions, Ytterbium, Energy transfer, Erbium

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SPIE Journal Paper | 22 October 2018 Open Access

Spatiotemporal laser speckle flowmetry based on elastic-walled U-shaped tubing apparatus: optical method for urinary flow measurement

Seungsoo Hong, Hyuntai Kim, Kyoungyoon Park, Youngchul Kwon, Hanbyul Chang, Songzhe Piao, Young Ju Lee, Seung-June Oh, Yoonchan Jeong

OE, Vol. 57, Issue 10, 104110, (October 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.10.104110

KEYWORDS: Laser speckle contrast imaging, Speckle, CCD cameras, Optical engineering, Calibration, Computer aided design, Bladder, 3D printing, Water, Electronics

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Proceedings Article | 19 February 2009 Paper

Fiber design for high-power fiber lasers

Jayanta Sahu, Seongwoo Yoo, Alexander Boyland, Andrew Webb, Mridu Kalita, Jean-Noel Maran, Yoonchan Jeong, Johan Nilsson, W. Andrew Clarkson, David Payne

Proceedings Volume 7195, 71950I (2009) https://doi.org/10.1117/12.809210

KEYWORDS: Acoustics, Fiber lasers, Cladding, Refractive index, Structured optical fibers, High power fiber lasers, Scattering, Solids, Signal attenuation, Control systems

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Proceedings Article | 12 August 2008 Paper

Progress in high-power single frequency master oscillator power amplifier

Jean-Noel Maran, Yoonchan Jeong, Seongwoo Yoo, Jayanta Sahu, Johan Nilsson

Proceedings Volume 7099, 70990X (2008) https://doi.org/10.1117/12.807075

KEYWORDS: Phase modulation, Optical amplifiers, Fiber lasers, Cladding, Amplifiers, Polarization, Fiber amplifiers, High power lasers, Oscillators, Ytterbium

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Proceedings Article | 17 September 2007 Paper

RGB generation by four-wave mixing in small-core holey fibers

Peter Horak, Pascal Dupriez, Francesco Poletti, Marco Petrovich, Yoonchan Jeong, Johan Nilsson, David Richardson, David Payne

Proceedings Volume 6698, 66980P (2007) https://doi.org/10.1117/12.738483

KEYWORDS: Optical fibers, RGB color model, Fiber lasers, Four wave mixing, Picosecond phenomena, Raman spectroscopy, Birefringence, Silica, Light sources, Phase matching

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Proceedings Article | 21 February 2007 Paper

High-power high-brightness green laser based on a frequency doubled picosecond fiber laser

P. Dupriez, J. Sahu, Y. Jeong, A. Malinowski, D. Richardson, J. Nilsson

Proceedings Volume 6453, 64531H (2007) https://doi.org/10.1117/12.717529

KEYWORDS: Picosecond phenomena, Crystals, Fiber lasers, Second-harmonic generation, Fiber amplifiers, Nonlinear crystals, Laser crystals, Polarization, Optical amplifiers, Amplifiers

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Proceedings Article | 2 October 2006 Paper

Opportunities in high-power fiber lasers

Jayanta Sahu, Jaesun Kim, Seongwoo Yoo, Andrew Webb, Christophe Codemard, Pascal Dupriez, Yoonchan Jeong, Johan Nilsson, David Richardson, David Payne

Proceedings Volume 6389, 638909 (2006) https://doi.org/10.1117/12.687497

KEYWORDS: Fiber lasers, Optical filters, High power fiber lasers, Waveguides, Fiber amplifiers, Silica, Structured optical fibers, Cladding, Optical fibers, Pulsed laser operation

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Proceedings Article | 23 February 2006 Paper

Depressed clad hollow optical fiber with fundamental LP₀₁ mode cut-off

J. Kim, P. Dupriez, D.B.S. Soh, C. Codemard, S. Yoo, Y. Jeong, J. Nilsson, J. Sahu

Proceedings Volume 6102, 61020G (2006) https://doi.org/10.1117/12.653146

KEYWORDS: Fiber lasers, Cladding, Optical fibers, Absorption, Refractive index, Waveguides, Mirrors, Optical filters, Fiber characterization, Structured optical fibers

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Proceedings Article | 23 February 2006 Paper

1 W average power at 589 nm from a frequency doubled pulsed Raman fiber MOPA system

P. Dupriez, C. Farrell, M. Ibsen, J. Sahu, J. Kim, C. Codemard, Y. Jeong, D. Richardson, J. Nilsson

Proceedings Volume 6102, 61021G (2006) https://doi.org/10.1117/12.643864

KEYWORDS: Raman spectroscopy, Fiber lasers, Picosecond phenomena, Ytterbium, Continuous wave operation, Laser guide stars, Laser systems engineering, Fiber amplifiers, Optical simulations, Second-harmonic generation

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Proceedings Article | 22 April 2005 Paper

Kilowatt-class single-frequency fiber sources

D. Payne, Y. Jeong, J. Nilsson, J. Sahu, D. Soh, C. Alegria, P. Dupriez, C. Codemard, V. Philippov, V. Hernandez, R. Horley, L. Hickey, L. Wanzcyk, C. Chryssou, J. Alvarez-Chavez, P. Turner

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.601145

KEYWORDS: Fiber lasers, Amplifiers, Coating, Laser scattering, Scattering, Optical amplifiers, Diodes, Ytterbium, Silica, Raman spectroscopy

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Proceedings Article | 22 April 2005 Paper

Analytic modeling of Brillouin gain in rare-earth doped fiber amplifiers with high-power single-frequency signals

V. Kovalev, R. Harrison, J. Nilsson, Y. Jeong, V. Hernandes-Solis, J. Sahu

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.591913

KEYWORDS: Fiber amplifiers, Amplifiers, High power fiber amplifiers, Picosecond phenomena, Optical amplifiers, Absorption, Fiber lasers, Optical fibers, Nonlinear optics, Laser scattering

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Proceedings Article | 22 April 2005 Paper

Advances in high-power short-pulse fiber laser systems and technology

J. Price, A. Malinowski, A. Piper, F. He, W. Belardi, T. Monro, M. Ibsen, B. Thomsen, Y. Jeong, C. Codemard, M. Roelens, P. Dupriez, J. Sahu, J. Nilsson, D. Richardson

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.602600

KEYWORDS: Optical amplifiers, Dispersion, Fiber amplifiers, Fiber lasers, Micro optical fluidics, Ytterbium, Amplifiers, Laser applications, Neodymium, Picosecond phenomena

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Proceedings Article | 23 December 2004 Paper

Thulium-ytterbium co-doped fiber laser with 75 W of output power at 2 µm

Yoonchan Jeong, Pascal Dupriez, Jayanta Sahu, Johan Nilsson, Deyuan Shen, W. Andrew Clarkson, Stuart Jackson

Proceedings Volume 5620, (2004) https://doi.org/10.1117/12.578727

KEYWORDS: Ytterbium, Thulium, Fiber lasers, Absorption, Diodes, Erbium, Mirrors, Tunable lasers, Coating, Energy transfer

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SPIE Journal Paper | 1 September 2004

Characteristics of remote hologram multiplexing with random pattern references from a multimode fiber bundle

Seunghoon Han, Yoochan Jeong, Jungwook Paek, Taesu Kim, Byoungho Lee

OE, Vol. 43, Issue 09, (September 2004) https://doi.org/10.1117/12.10.1117/1.1775233

KEYWORDS: Multiplexing, Holograms, Crystals, Wave propagation, Multimode fibers, Diffraction, Data storage, Waveguides, Image retrieval, Volume holography

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Proceedings Article | 7 June 2004 Paper

Latest development of high-power fiber lasers in SPI

Stephen Norman, Mikhail Zervas, Andrew Appleyard, Michael Durkin, Ray Horley, Malcolm Varnham, Johan Nilsson, Yoonchan Jeong

Proceedings Volume 5335, (2004) https://doi.org/10.1117/12.537739

KEYWORDS: Fiber lasers, Laser applications, Diodes, High power fiber lasers, Optical amplifiers, Laser systems engineering, Cladding, Structured optical fibers, Continuous wave operation, Reliability

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High Power Fiber Lasers (HPFLs) and High Power Fiber Amplifiers (HPFAs) promise a number of benefits in terms of their high optical efficiency, degree of integration, beam quality, reliability, spatial compactness and thermal management. These benefits are driving the rapid adoption of HPFLs in an increasingly wide range of applications and power levels ranging from a few Watts, in for example analytical applications, to high-power >1kW materials processing (machining and welding) applications. This paper describes SPI’s innovative technologies, HPFL products and their performance capabilities. The paper highlights key aspects of the design basis and provides an overview of the applications space in both the industrial and aerospace domains. Single-fiber CW lasers delivering 1kW output power at 1080nm have been demonstrated and are being commercialized for aerospace and industrial applications with wall-plug efficiencies in the range 20 to 25%, and with beam parameter products in the range 0.5 to 100 mm.mrad (corresponding to M² = 1.5 to 300) tailored to application requirements. At power levels in the 1 - 200 W range, SPI’s proprietary cladding-pumping technology, GTWave^TM, has been employed to produce completely fiber-integrated systems using single-emitter broad-stripe multimode pump diodes. This modular construction enables an agile and flexible approach to the configuration of a range of fiber laser / amplifier systems for operation in the 1080nm and 1550nm wavelength ranges. Reliability modeling is applied to determine Systems martins such that performance specifications are robustly met throughout the designed product lifetime. An extensive Qualification and Reliability-proving programme is underway to qualify the technology building blocks that are utilized for the fiber laser cavity, pump modules, pump-driver systems and thermo-mechanical management. In addition to the CW products, pulsed fiber lasers with pulse energies exceeding 1mJ with peak pulse powers of up to 50kW have been developed and are being commercialized. In all cases reducing the total “cost of ownership” for customers and end users is our primary objective.

Proceedings Article | 7 June 2004 Paper

Wideband tunable high-power narrow-linewidth erbium-ytterbium-doped fiber laser using compression-tunable fiber Bragg grating

Carlos Alegria, Yoonchan Jeong, Christophe Codemard, Jayanta Sahu, Libin Fu, Mohd Mokhtar, Morten Ibsen, Seungin Baek, Daniel Soh, Valery Philippov, Johan Nilsson

Proceedings Volume 5335, (2004) https://doi.org/10.1117/12.528190

KEYWORDS: Fiber lasers, Single mode fibers, Fiber Bragg gratings, Tunable lasers, Diodes, Ytterbium, Cladding, Laser applications, Laser resonators, Ions

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Proceedings Article | 21 October 2003 Paper

Remote multiplexing of holograms with random patterns from multimode fiber bundle

Byoungho Lee, Seunghoon Han, Yoonchan Jeong

Proceedings Volume 5206, (2003) https://doi.org/10.1117/12.505417

KEYWORDS: Multiplexing, Holograms, Crystals, Multimode fibers, Diffraction, Wave propagation, Free space optics, Superposition, Data storage, Volume holography

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Proceedings Article | 3 July 2003 Paper

High-power fiber lasers: new developments

Johan Nilsson, Jayanta Sahu, Yoochan Jeong, W. Clarkson, R. Selvas, Anatoly Grudinin, Shaiful Alam

Proceedings Volume 4974, (2003) https://doi.org/10.1117/12.478310

KEYWORDS: Fiber lasers, Cladding, Ytterbium, Glasses, Diodes, Absorption, Laser damage threshold, Optical amplifiers, High power fiber lasers, Laser crystals

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SPIE Journal Paper | 1 April 2003

Polarization-isolated electrical modulation of an etched long-period fiber grating with an outer liquid-crystal cladding

Yoonchan Jeong, Hak Rin Kim, Seungin Baek, Yonghyun Kim, Yong Wook Lee, SinDoo Lee, Byoungho Lee

OE, Vol. 42, Issue 04, (April 2003) https://doi.org/10.1117/12.10.1117/1.1555011

KEYWORDS: Cladding, Modulation, Liquid crystals, Polarization, Refractive index, Molecules, Optical filters, Single mode fibers, Numerical simulations, Fiber optics

Proceedings Article | 27 November 2002 Paper

Reflection-type integral imaging for displaying three-dimensional images

Byoungho Lee, Yoonchan Jeong, Sungyong Jung, Jae-Hyeung Park

Proceedings Volume 4789, (2002) https://doi.org/10.1117/12.453840

KEYWORDS: Mirrors, 3D image processing, Integral imaging, 3D displays, Imaging arrays, Beam splitters, Imaging systems, Projection systems, Photography, Image processing

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SPIE Journal Paper | 1 August 2002

Macrobend sensor via the use of a hollow-core splice fiber: theory and experiments

Yoonchan Jeong, Seungin Baek, Byoungho Lee, Sangsoo Choi, Kyunghwan Oh

OE, Vol. 41, Issue 08, (August 2002) https://doi.org/10.1117/12.10.1117/1.1487366

KEYWORDS: Sensors, Single mode fibers, Cladding, Refractive index, Optical engineering, Image segmentation, Fiber optics sensors, Fiber optics, Fiber characterization, Temperature metrology

Proceedings Article | 23 January 2002 Paper

Coupled-mode analysis of volume holograms in discretized domain

Yoonchan Jeong, Byoungho Lee

Proceedings Volume 4459, (2002) https://doi.org/10.1117/12.454030

KEYWORDS: Holograms, Volume holography, Multiplexing, Diffraction, Crystals, Gaussian beams, Speckle pattern, Holography, Spatial frequencies, Beam propagation method

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Proceedings Article | 11 October 2001 Paper

Analysis of long-period liquid-crystal fiber gratings

Yoonchan Jeong, Byoungho Lee

Proceedings Volume 4604, (2001) https://doi.org/10.1117/12.444602

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Proceedings Article | 11 October 2001 Paper

Applications of linear and nonlinear fiber grating properties for optical communications

Byoungho Lee, Yoonchan Jeong, Jungho Kim

Proceedings Volume 4604, (2001) https://doi.org/10.1117/12.444601

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SPIE Journal Paper | 1 July 2001

Theory of electrically controllable long-period gratings built in liquid-crystal fibers

Yoonchan Jeong, Byoungho Lee

OE, Vol. 40, Issue 07, (July 2001) https://doi.org/10.1117/12.10.1117/1.1371933

Proceedings Article | 9 November 2000 Paper

A self-referencing fiber-optic sensor for macro-bending detection immune to temperature and strain perturbations

Yoonchan Jeong

Proceedings Volume 4185, 41853E (2000) https://doi.org/10.1117/12.2302265

KEYWORDS: Fiber Bragg gratings, Fiber optics sensors, Sensors, Remote sensing, Single mode fibers, Head, Temperature metrology, Directed self assembly, Buildings, Bridges

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