Dr. Hyukmo Kang Profile

Dr. Hyukmo Kang

Postdoc researcher at Wyant College of Optical Sciences

SPIE Involvement:

Author

Area of Expertise:

Alignment , Deflectometry , Dwell time optimization , Design , Optical testing

Publications (26)

Proceedings Article | 1 October 2024 Presentation + Paper

Static metrology of the meter-scale deformable heliostat

Yiyang Huang, Roger Angel, Hyukmo Kang, Heejoo Choi, Matt Rademacher, Hill Tailor, Rebecca Su, Daewook Kim

Proceedings Volume 13132, 131320E (2024) https://doi.org/10.1117/12.3026858

KEYWORDS: Metrology, Deflectometry, Deformation, Reflectors, Displays, Reflection, Actuators, Data processing, Zemax, Phase unwrapping

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Proceedings Article | 30 September 2024 Presentation + Paper

Alignment of three mirror anastigmat telescopes using a multilayered stochastic parallel gradient descent algorithm

Solvay Blomquist, Heejoo Choi, Hyukmo Kang, Kevin Derby, Pierre Nicolas, Ewan Douglas, Daewook Kim

Proceedings Volume 13134, 131340F (2024) https://doi.org/10.1117/12.3028105

KEYWORDS: Telescopes, Stochastic processes, Mirrors, Algorithm development, Wavefront errors, Model based design, Wavefronts, Optical alignment, Wavefront sensors, Photovoltaics

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Proceedings Article | 30 September 2024 Presentation + Paper

Focus diverse phase retrieval test results on broadband continuous wavefront sensing in space telescope applications

Hyukmo Kang, Kyle Van Gorkom, Meghdoot Biswas, Daewook Kim, Ewan Douglas

Proceedings Volume 13134, 131340A (2024) https://doi.org/10.1117/12.3027747

KEYWORDS: Phase retrieval, Point spread functions, Bandpass filters, Wavefront sensors, Telescopes, Space telescopes, Device simulation, Wavefront errors

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Proceedings Article | 30 September 2024 Presentation + Paper

Temporal variability in magnetically actuated deformable mirror surface figure measured via interferometry

Meghdoot Biswas, Hyukmo Kang, Ewan Douglas, Daewook Kim

Proceedings Volume 13134, 1313409 (2024) https://doi.org/10.1117/12.3028231

KEYWORDS: Monochromatic aberrations, Deformable mirrors, Mirror surfaces, Phase interferometry, Interferometers, Coronagraphy, Interferometry, Error analysis, Data acquisition, Shearing interferometers

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Proceedings Article | 4 October 2023 Presentation + Paper

Analysis of active optics correction for a large honeycomb mirror

Solvay Blomquist, Hubert Martin, Hyukmo Kang, Rebecca Whitsitt, Kevin Derby, Heejoo Choi, Ewan Douglas, Daewook Kim

Proceedings Volume 12677, 126770H (2023) https://doi.org/10.1117/12.2677069

KEYWORDS: Wavefront errors, Actuators, Active optics, Mirrors, Mirror surfaces, Device simulation, Telescopes, Error analysis, Computer simulations, Surface finishing

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Proceedings Article | 4 October 2023 Presentation + Paper

Approaches to developing tolerance and error budget for active three mirror anastigmat space telescopes

Heejoo Choi, Young-Sik Kim, Hyukmo Kang, Solvay Blomquist, Hill Tailor, Douglas Kelly, Mike Eiklenborg, Ewan Douglas, Daewook Kim

Proceedings Volume 12677, 126770F (2023) https://doi.org/10.1117/12.2677986

KEYWORDS: Tolerancing, Received signal strength, Telescopes, Mirrors, Wavefront errors, Observatories, Space mirrors, Space telescopes, Optical surfaces, Optical design

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Proceedings Article | 4 October 2023 Presentation + Paper

Focus diverse phase retrieval testbed development of continuous wavefront sensing for space telescope applications

Hyukmo Kang, Kyle Van Gorkom, Jess Johnson, Ole Singelstad, Aaron Goldtooth, Daewook Kim, Ewan Douglas

Proceedings Volume 12677, 126770G (2023) https://doi.org/10.1117/12.2677900

KEYWORDS: Signal to noise ratio, Phase retrieval, Point spread functions, Monochromatic aberrations, Wavefront sensors, Wavefront errors, Interferometers, Space telescopes, Telescopes

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Proceedings Article | 4 October 2023 Presentation + Paper

Integrated modeling of wavefront sensing and control for space telescopes utilizing active and adaptive optics

Kevin Derby, Kian Milani, Solvay Blomquist, Kyle Van Gorkom, Sebastiaan Haffert, Hyukmo Kang, Hill Tailor, Heejoo Choi, Christopher Mendillo, Jared Males, Daewook Kim, Ewan Douglas

Proceedings Volume 12677, 126770I (2023) https://doi.org/10.1117/12.2677663

KEYWORDS: Telescopes, Wavefronts, Wavefront errors, Wavefront sensors, Point spread functions, Coronagraphy, Signal to noise ratio, Error analysis, Integrated modeling, Wavefront compensation

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Proceedings Article | 4 October 2023 Paper

Approaches to lowering the cost of large space telescopes

Ewan Douglas, Greg Aldering, Greg Allan, Ramya Anche, Roger Angel, Cameron Ard, Supriya Chakrabarti, Laird Close, Kevin Derby, Jerry Edelstein, John Ford, Jessica Gersh-Range, Sebastiaan Haffert, Patrick Ingraham, Hyukmo Kang, Douglas Kelly, Daewook Kim, Michael Lesser, Jarron Leisenring, Yu-Chia Lin, Jared Males, Buddy Martin, Bianca Alondra Payan, Sai Krishanth P. M., David Rubin, Sanford Selznick, Kyle Van Gorkom, Buell Jannuzi, Saul Perlmutter

Proceedings Volume 12677, 126770D (2023) https://doi.org/10.1117/12.2677843

KEYWORDS: Space telescopes, Design and modelling, Telescopes, Observatories, Mirrors, James Webb Space Telescope, Space mirrors, Equipment, Astronomy, Coronagraphy

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Proceedings Article | 4 October 2023 Presentation + Paper

Advanced deflectometry methods for industrial application

Heejoo Choi, Hyukmo Kang, Yiyang Huang, Mina Yoo, Henry Quach, John Kam, Daewook Kim

Proceedings Volume 12684, 1268407 (2023) https://doi.org/10.1117/12.2678628

KEYWORDS: Deflectometry, Optical alignment, Image processing, Optical testing, Dark field illumination, Industrial applications

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Deflectometry is a versatile optical testing tool used in various fields, from astronomy to industrial applications, due to its non-null testing capability which facilitates precise measurement despite challenging optical surfaces and system layout constraints. In this manuscript, we present novel variational advancements to traditional deflectometry, towards universal functionality and system friendliness. Traditional dark-field illumination is an inspection technique that is sometimes used to detect particles on a specular surface. Problems arise in its repeatability, as an intensity-based measurement is vulnerably dependent on the testing conditions of time, limiting its ability to be used in automated fashion. The first advancement leverages phase algorithms commonly seen in deflectometry; by adding a secondary light source (normal to the surface) and modulating each source's intensity with a time-varying sinusoid. The phase-based information has a higher sensitivity to the light scattered from a defect producing a more robust computational image process method that is now insensitive to the environment. The second advancement is an alignment method to obtain lower-order shape. While deflectometry proves effective in measuring mid-to-high frequency surface shape, it faces challenges when assessing low-order shape measurements like power, astigmatism, and coma due to relative position and alignment error between the unit under test (UUT) and the deflectometry system. To avert the necessity of additional instruments like a coordinate measuring machine, laser trackers, or interferometers, we leveraged computational fiducials and sensitivity matrices to identify and address misalignments effectively. With enhanced capabilities and system-friendly features, our advanced deflectometry techniques provide powerful options in optical testing. By addressing the challenges in low-order shape measurements and incorporating dark field testing, our approaches extend the potential of deflectometry as a valuable tool in optical metrology across a broad spectrum of industries and scientific endeavors.

SPIE Journal Paper | 2 December 2022

Plug-in cross-dispersing module for the Large Binocular Telescope’s infrared spectrograph LUCI

Hyukmo Kang, David Thompson, Al Conrad, James Wiese, Heejoo Choi, Vishnu Reddy, Daewook Kim

JATIS, Vol. 8, Issue 04, 045003, (December 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.4.045003

KEYWORDS: Mirrors, Infrared telescopes, Telescopes, Near infrared, Spectrographs, Prisms, Infrared radiation, Equipment, Sensors, Spherical lenses

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Proceedings Article | 3 October 2022 Presentation + Paper

Influence of lens and perspective distortion on optical surface metrology instrumentation

Henry Quach, Joel Berkson, Hyukmo Kang, Heejoo Choi, Daewook Kim

Proceedings Volume 12221, 122210M (2022) https://doi.org/10.1117/12.2633090

KEYWORDS: Distortion, Metrology, Imaging systems, Image processing, Cameras, Calibration

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Proceedings Article | 3 October 2022 Open Access

The practical optics workshop: educating the optical engineers of tomorrow

Jaren N. Ashcraft, Trenton Brendel, Simran Agarwal, Joel Berkson, Alexander Hedglen, Hyukmo Kang, Yanqi Zhang, Heejoo Choi, Daewook Kim

Proceedings Volume 12213, 122130H (2022) https://doi.org/10.1117/12.2632801

KEYWORDS: Optics education, Education and training, Optical design, Optical engineering, Optical design software

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Proceedings Article | 29 August 2022 Poster + Paper

The Large Fiber Array Spectroscopic Telescope: fiber feed and spectrometer conceptual design

Chad Bender, J. Roger Angel, Joel Berkson, Peter Gray, Samuel Halverson, Hyukmo Kang, Daewood Kim, Andy Monson, Chang Jin Oh, Matthew Rademacher, Christian Schwab, Andrew Young, Dennis Zaritsky

Proceedings Volume 12184, 121844J (2022) https://doi.org/10.1117/12.2628710

KEYWORDS: Telescopes, Spectroscopy, Optical instrument design, Mirrors, Spectrometer engineering, Relays, Prototyping, Optical design, Spherical lenses, Photoresist materials

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Proceedings Article | 26 August 2022 Poster + Paper

The Large Fiber Array Spectroscopic Telescope: opto-mechanical design and architecture

Andrew Young, Roger Angel, Chad Bender, Joel Berkson, Peter Gray, Samuel Halverson, Hyukmo Kang, Daewook Kim, Andy Monson, Chang-Jin Oh, Matthew Rademacher, Christian Schwab, Dennis Zaritsky

Proceedings Volume 12182, 121824B (2022) https://doi.org/10.1117/12.2629330

KEYWORDS: Telescopes, Mirrors, Optical tracking, Finite element methods, Spectroscopy

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Proceedings Article | 24 August 2021 Open Access

Deflectometry-based thermal vacuum testing for a pneumatic terahertz antenna

Henry Quach, Marcos Esparza, Hyukmo Kang, Aman Chandra, Heejoo Choi, Joel Berkson, Karlene Karrfalt, Siddhartha Sirsi, Yuzuru Takashima, Art Palisoc, Jonathan Arenberg, Kristy Gogick Marshall, Christopher Glynn, Sean Godinez, Marcos Tafoya, Christopher Walker, Christian Drouet d'Aubigny, Daewook Kim

Proceedings Volume 11820, 118200W (2021) https://doi.org/10.1117/12.2594902

KEYWORDS: Deflectometry, Calibration, Cameras, Antennas, Metrology

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Proceedings Article | 24 August 2021 Open Access

Stressed deformable reflector design and pneumatic membrane antenna for cryogenic thermal vacuum chamber testing

Marcos Esparza, Heejoo Choi, Hyukmo Kang, Christian d'Aubigny, Amarjiit Pandde, Henry Quach, Aman Chandra, Karlene Karrfalt, Yuzuru Takashima, Art Palisoc, Jonathan Arenberg, Kristy Gogick Marshall, Christopher Glynn, Sean Godinez, Marcos Tafoya, Brandon Chalifoux, Christopher Walker, Daewook Kim

Proceedings Volume 11820, 118200R (2021) https://doi.org/10.1117/12.2594403

KEYWORDS: Actuators, Reflectors, Computer aided design, Antennas, Prototyping, Polonium, Reflector design, Aluminum, Wavefronts, Solid modeling

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SPIE Journal Paper | 12 March 2021

Long-slit cross-dispersion spectroscopy for Hyperion UV space telescope

Heejoo Choi, Isaac Trumper, Yi-Ting Feng, Hyukmo Kang, Joel Berkson, Haeun Chung, Erika Hamden, Dae Wook Kim

JATIS, Vol. 7, Issue 01, 014006, (March 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.014006

KEYWORDS: Spectroscopy, Sensors, Ultraviolet radiation, Space telescopes, Spectral resolution, Diffraction gratings, Optical design, Freeform optics, Diffraction, Mirrors

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Proceedings Article | 15 January 2021 Paper

Optical technology for future telescopes

Dae Wook Kim, Marcos Esparza, Henry Quach, Stephanie Rodriguez, Hyukmo Kang, Yi-Ting Feng, Heejoo Choi

Proceedings Volume 11761, 1176103 (2021) https://doi.org/10.1117/12.2586867

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Proceedings Article | 20 August 2020 Presentation + Paper

Computational alignment of on-machine deflectometry

Hyukmo Kang, Henry Quach, Heejoo Choi, Greg Smith, Dae Wook Kim

Proceedings Volume 11487, 114870O (2020) https://doi.org/10.1117/12.2576955

KEYWORDS: Deflectometry, Computer simulations, Sensors, Calibration, Cameras, Optical alignment, Measurement devices, Ray tracing

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Proceedings Article | 20 August 2020 Presentation + Paper

Hyperion: Far-UV cross dispersion spectroscope design

Heejoo Choi, Isaac Trumper, Yi-Ting Feng, Hyukmo Kang, Erika Hamden, Dae Wook Kim

Proceedings Volume 11487, 114870W (2020) https://doi.org/10.1117/12.2570489

KEYWORDS: Spectroscopy, Optical design, Spectral resolution, Diffraction gratings, Diffraction, Mirrors, Freeform optics, Telescopes

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Proceedings Article | 20 August 2020 Presentation + Paper

Non-planar illumination sources for deflectometry

Henry Quach, Hyukmo Kang, Heejoo Choi, Dae Wook Kim

Proceedings Volume 11487, 114870L (2020) https://doi.org/10.1117/12.2568168

KEYWORDS: Deflectometry, Optics manufacturing, Prototyping, Light sources

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Proceedings Article | 7 April 2020 Paper

Reconfigurable dynamic optical system design, test, and data analysis

Dae Wook Kim, Maham Aftab, Isaac Trumper, Logan Graves, Henry Quach, Hyukmo Kang, Hyemin Yoo, Andrew Lowman, Greg Smith, Matt Dubin, Chang-Jin Oh, Justin Hyatt, Christian Davila-Peralta, Heejoo Choi

Proceedings Volume 11352, 1135202 (2020) https://doi.org/10.1117/12.2555650

KEYWORDS: Deflectometry, Freeform optics, Optical testing, Optical design, Optics manufacturing, Infrared radiation, Metrology, Data analysis, Mirrors

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Proceedings Article | 9 September 2019 Paper

Modular plug-in extension enabling cross-dispersed spectroscopy for Large Binocular Telescope

Hyukmo Kang, David Thompson, Al Conrad, Conrad Vogel, Ariel Lamdan, Dae Wook Kim

Proceedings Volume 11116, 1111606 (2019) https://doi.org/10.1117/12.2528865

KEYWORDS: Mirrors, Telescopes, Prisms, Near infrared, Spectrographs, Spectroscopy, Image quality, Sensors, Imaging spectroscopy

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Proceedings Article | 3 September 2015 Paper

Alignment performance comparison between MFR and MDCO for a TMA optical system

Hyukmo Kang, Eunsong Oh, Sug-Whan Kim

Proceedings Volume 9582, 95820G (2015) https://doi.org/10.1117/12.2188244

KEYWORDS: Mirrors, Optical alignment, Monte Carlo methods, Wavefronts, Computer simulations, Detection and tracking algorithms, Remote sensing, Sensors, Spherical lenses, Off axis mirrors

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Proceedings Article | 1 July 2015 Paper

Design and performance analysis of front end optical instrument for coastal water remote sensing

Eunsong Oh, Hyukmo Kang, Sangwon Hyun, Geon-Hee Kim, YoungJe Park, Jong-Kuk Choi, Sug-Whan Kim

Proceedings Volume 9655, 96553Z (2015) https://doi.org/10.1117/12.2185287

KEYWORDS: Sensors, Signal to noise ratio, Mirrors, Unmanned aerial vehicles, Remote sensing, Ocean optics, Modulation transfer functions, Spatial resolution, Tolerancing, Satellites

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Showing 5 of 26 publications

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