Dr. Jihun Kim Profile

Dr. Jihun Kim

System Engineer at Korea Astronomy and Space Science Institute

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 20 November 2024 Poster + Paper

Testing plan of NA 0.8 deep UV objective system for semiconductor defect inspection

Yunjong Kim, Jihun Kim, JaeHee Byun, HanRim Chae, KyoungSang Moon, Minkyu Jung, Wonbin Choi, Ingu Chang, Hyun-il Cho

Proceedings Volume 13216, 132162C (2024) https://doi.org/10.1117/12.3037799

KEYWORDS: Deep ultraviolet, Objectives, Lenses, Mirrors, Semiconductors, Optical alignment, Combined lens-mirror systems, Optical fabrication, Defect inspection, Optical design

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Proceedings Article | 30 September 2024 Presentation + Paper

Integration of off-axis freeform mirrors KASI deep rolling imaging fast telescope generation 1

Yunjong Kim, Dohoon Kim, Seunghyuk Chang, Jihun Kim, Il Kweon Moon, Hyukson Kwon, Woowon Byun, Yongseok Lee, Changhee Lee, Kyohoon Ahn, Yeonsik Kim, Gayoung Lee, Daewook Kim, Jongwan Ko

Proceedings Volume 13134, 131340C (2024) https://doi.org/10.1117/12.3028442

KEYWORDS: Mirrors, Telescopes, Tolerancing, Off axis mirrors, Optical design, Assembly tolerances, Wavefront errors, Mirror surfaces, Freeform optics, Confocal microscopy

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Proceedings Article | 26 August 2024 Poster

Integration of freeform three-mirror KASI deep-rolling-imaging fast telescope

Yunjong Kim, Dohoon Kim, Changhee Lee, Seunghyuk Chang, Jihun Kim, Il Kweon Moon, Hyukson Kwon, Woowon Byun, Yongseok Lee, Yeonsik Kim, Daewook Kim, Jongwan Ko

Proceedings Volume 13100, 131004D (2024) https://doi.org/10.1117/12.3019659

Proceedings Article | 23 August 2024 Presentation + Paper

CODEX optical design and alignment

Qian Gong, Jeffrey Newmark, Yeon-Han Kim, Marta Casti, Lucia Abbo, Ji-Hye Baek, Su-Chan Bong, Jason Budinoff, Gerado Capobianco, Kyungsuk Cho, Seonghwan Choi, Silvano Fineschi, Hervé Haudemand, Jihun Kim, Federico Landini, Davide Loreggia, Sung-Hong Park, Jongyeob Park, Nelson Reginald, Donguk Song, Heesu Yang, Luca Zangrilli

Proceedings Volume 13092, 130922I (2024) https://doi.org/10.1117/12.3020705

KEYWORDS: Diffraction, Coronagraphy, Optical alignment, Telescopes, Stray light, Cameras, Vignetting, Optical design

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The COronal Diagnostic EXperiment (CODEX) is a Heliophysics mission to measure the density, temperature, and velocity of the electrons in the solar corona with the primary goal of improving our understanding of the physical conditions of the solar wind in the acceleration region. The temperature and velocity measurement requires much higher signal-to-noise ratio than the density measurements. In solar coronagraphs, the diffraction of the solar disk light due to the occulting element is the dominant source of noise. Therefore, to further suppress the diffracted sun light with respect to the existing coronagraphs is a critical element of the CODEX design. To minimize the stray light due to diffraction, the selected optical design is a two-stage standard coronagraph with an external occulter, an internal occulter, and a Lyot stop. What is unique for this design is that a focal mask was inserted at the telescope focal plane. It works together with the field lens suppressing the stray light down by ~ another order of magnitude as compared to a traditional three-stage approach. During the optical design, a Fourier Transform based beam propagation software, i.e., GLAD, was used to model the beam path through the full coronagraph, from the external occulter to the detector array. All diffraction sensitive elements: external occulter, internal occulter, focal mask, and Lyot stop were carefully modeled and optimized. As a result, the requirement of achieving a stray light level which is one order of magnitude lower than F-corona was satisfied. On the other hand, to achieve the final suppression, a precision optical alignment is another must. This paper also presents our creative alignment procedure: using the combination of metrology, precision alignment equipment, and real time diffraction ring monitoring to minimize the diffraction. The final test results show that the suppression ratio (B/B0) reaches 10-11 level, which is equivalent to one order of magnitude lower than F-corona.

Proceedings Article | 23 August 2024 Poster + Paper

Polarimetric characterization of the coronal diagnostic experiment (CODEX)

Marta Casti, Jeffrey Newmark, Yeon-Han Kim, Gerardo Capobianco, Hervé Haudemand, Donguk Song, Sung-Hong Park, Su-Chan Bong, Kyungsuk Cho, Seonghwan Choi, Qian Gong, Ji-Hye Baek, Jongyeob Park, Jihun Kim, Heesu Yang, Nelson Reginald, Nicholeen Viall, Silvano Fineschi, Federico Landini, Davide Loreggia, Luca Zangrilli, Lucia Abbo, Jason Budinoff

Proceedings Volume 13092, 130927O (2024) https://doi.org/10.1117/12.3020730

KEYWORDS: Polarization, Coronagraphy, Equipment, Polarimetry, Sensors, Demodulation, Polarized light, Modulation, Linear polarizers, Polarization imaging

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Proceedings Article | 23 August 2024 Poster + Paper

Test results of GrainCams EQM payload for the CLPS lunar rover

Woojin Kim, Bongkon Moon, Dukhang Lee, Dae-Hee Lee, Minbae Kim, Minsup Jeong, Jihun Kim, Sung-joon Park, Yunjong Kim, Seonghwan Choi, Jehyuck Shin, Mingyeong Lee, Seul-Min Baek, Chae Kyung Sim, Young-Jun Choi, Sungsoo Kim

Proceedings Volume 13092, 130927B (2024) https://doi.org/10.1117/12.3019741

KEYWORDS: Vibration, Modulation transfer functions, Reliability, Vacuum, Particles, Mechanical engineering

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Proceedings Article | 18 July 2024 Presentation + Paper

Innovations in the design and construction of the GMT-Consortium Large Earth Finder (G-CLEF), a first-light instrument for the Giant Magellan Telescope (GMT)

Andrew Szentgyorgyi, Sagi Ben-Ami, Jae Sok Oh, Chan Park, Daniel Baldwin, Jacob Bean, Alex Bichkovsky, Patricia Brennan, Daniel Catropa, Chueh-Yi Chou, Moo-Young Chun, Laird Close, Jeffrey Crane, Peter Doherty, Daniel Durusky, Jason Eastman, Harland Epps, Ian Evans, Vitor Hartmann, Ofir Hershko, Bi-Ho Jang, Jeong-Gyun Jang, Ueejeong Jeong, Andres Jordan, Colby Jurgenson, Jan Kansky, Jihun Kim, Kang-Min Kim, Sanghyuk Kim, Yunjong Kim, Sungho Lee, Matthew Leung, Hung-Hsu Ling, Henrique Lupinari, Jared Males, Kenneth McCracken, Claudia Mendes de Oliveira, Rafael Millan-Gabet, Mark Mueller, Heeyoung Oh, Cem Onyuksel, Byeong-Gon Park, Sung-Joon Park, Woojin Park, William Podgorski, Andreas Seifahrt, Matthew Smith, Yahel Sofer-Rimalt, Shiang-Yu Wang, Abigail Unger, Alan Uomoto, Young-Sam Yu

Proceedings Volume 13096, 130960Z (2024) https://doi.org/10.1117/12.3018439

KEYWORDS: Telescopes, Calibration, Spectrographs, Interfaces, Design, Cameras, Optical fibers, Equipment, Echelle gratings, Exoplanets

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Proceedings Article | 17 June 2024 Presentation + Paper

Stray light analysis for the SurfCam

Jihun Kim, Minsup Jeong, Minbae Kim, Young-Jun Choi, Sungsoo Kim, Dukhang Lee, Bongkon Moon, Dae-Hee Lee, Seonghwan Choi, Chae Kyung Sim, Jehyuck Shin, Seul-Min Baek, Mingyeong Lee

Proceedings Volume 13019, 1301905 (2024) https://doi.org/10.1117/12.3016902

KEYWORDS: Stray light, Stray light analysis, Signal to noise ratio, Sensors, Scattered light, Lenses, Light scattering, Optomechanical design, Incident light

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Proceedings Article | 11 March 2024 Presentation + Paper

Current status of SurfCam development

Jihun Kim, Minsup Jeong, Minbae Kim, Youngju Kim, Young-Jun Choi, Sungsoo Kim, Dukhang Lee, Bongkon Moon, Dae-Hee Lee, Seonghwan Choi, Chae Kyung Sim, Jehyuck Shin, Seul-Min Baek, Mingyeong Lee

Proceedings Volume 12893, 1289302 (2024) https://doi.org/10.1117/12.3002168

KEYWORDS: Optical design, Modulation transfer functions, Design, 3D image processing, Cameras, Optics manufacturing, Microlens array, 3D metrology, Windows, Testing and analysis

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Proceedings Article | 5 October 2023 Presentation

Unveiling new frontiers: conceptual design of optical and EUV telescopes with instruments for the L4 mission

Jeong-Yeol Han, Jeongyeop Park, Sung-Hong Park, Eun-Kyung Lim, Donguk Song, Kyung-Suk Cho, Junga Hwang, Seonghwan Choi, Rok-Soon Kim, Jungjoon Seough, JongDae Sohn, Jihun Kim

Proceedings Volume 12676, 126760L (2023) https://doi.org/10.1117/12.2677366

KEYWORDS: Telescopes, Extreme ultraviolet, Design and modelling, Equipment, EUV optics, Space weather, Solar processes, Remote sensing, Optical telescopes, Magnetism

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Proceedings Article | 4 October 2023 Poster + Paper

Tolerance analysis of off-axis freeform three-mirror KASI-deep rolling imaging fast telescope

Yunjong Kim, Gayoung Lee, Jihun Kim, Seunghyuk Chang, Dohoon Kim, Il Kweon Moon, Daewook Kim, Jongwan Ko

Proceedings Volume 12677, 126770O (2023) https://doi.org/10.1117/12.2674544

KEYWORDS: Tolerancing, Mirrors, Telescopes, Monte Carlo methods, Optical design, Monochromatic aberrations, Mirror surfaces, Astronomical imaging, Wavefront errors

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Proceedings Article | 4 October 2023 Poster + Paper

Preliminary mechanical design of GrainCams payload for the CLPS lunar rover

Woojin Kim, Bongkon Moon, Dukhang Lee, Dae-Hee Lee, Min-Bae Kim, Minsup Jeong, Jihun Kim, Seonghwan Choi, Jehyuck Shin, Mingyeong Lee, Seul-Min Baek, Chae Kyung Sim, Young-Jun Choi, Sungsoo Kim

Proceedings Volume 12677, 126770R (2023) https://doi.org/10.1117/12.2677855

KEYWORDS: Safety, Contact lenses, Design and modelling, Modal analysis, Interfaces, Thermal analysis, Lenses, Structural analysis, Vibration, Temperature metrology

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Proceedings Article | 4 October 2023 Presentation + Paper

Optical design and analysis of the ROKITS cameras

Jihun Kim, Youngju Kim, Seonghwan Choi, Dukhang Lee, Gwanghui Jeong, Jongyeob Park, Ji-Hye Baek, Yunjong Kim, Tae-Yong Yang, Jaeheung Park, Kyoung-min Roh, Young-Sil Kwak, Chanhaeng Lee, Jong-Kyun Chung, Woo kyoung Lee

Proceedings Volume 12676, 126760U (2023) https://doi.org/10.1117/12.2676608

KEYWORDS: Optical design, Cameras, Tolerancing, Optical filters, Modulation transfer functions, Earth's atmosphere, Sensors, Atmospheric sciences, Auroras

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Proceedings Article | 8 March 2023 Presentation + Paper

Design and analysis of the light field camera for SurfCam

Jihun Kim, Minsup Jeong, Min Bae Kim, Youngju Kim, Young-Jun Choi, Sungsoo Kim, Dukhang Lee, Bongkon Moon, Dae-Hee Lee, Seonghwan Choi, Chae Kyung Sim, Mingyeong Lee, Jehyuck Shin

Proceedings Volume 12428, 1242803 (2023) https://doi.org/10.1117/12.2646524

KEYWORDS: Modulation transfer functions, Optical design, Windows, Lenses, Design and modelling, Transmittance, Tolerancing, Glasses, Coating, Cameras

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Proceedings Article | 29 August 2022 Poster

Design and analysis of the SiC solar telescope for extreme environments

Jihun Kim, Seonghwan Choi, Jeong-Yeol Han, Yunjong Kim, Ji-Hye Baek, Jongyeob Park, Heesu Yang, Sujin Kim, Young-Soo Kim, Jaegun Yoo, Youra Jun, Bi-Ho Jang, Il Kweon Moon, Dohoon Kim, Minkyum Kim, Gwanghui Jeong, Myung Cho

Proceedings Volume 12182, 1218233 (2022) https://doi.org/10.1117/12.2628857

KEYWORDS: Solar telescopes, Optical instrument design, Silicon carbide, Telescopes, Mirrors, Bridges, Off axis mirrors, Light scattering, Tolerancing, Temperature metrology

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Proceedings Article | 29 August 2022 Presentation

G@M: Design of the Giant Magellan Telescope Consortium Large Earth Finder (G-CLEF) for operations at the Magellan telescopes.

Andrew Szentgyorgyi, Stuart McMuldroch, Sagi Ben-Ami, Kang-Min Kim, Chan Park, Daniel Baldwin, Stuart Barnes, Daniel Bednarski, Jacob Bean, Patricia Brennan, Baptiste Callendret, Daniel Catropa, Moo-Young Chun, Laird Close, Jeffrey Crane, Daniel Durusky, Jason Eastman, Harland Epps, Ian Evans, Janet DePonte Evans, Thomas Gauron, Vitor Hartmann, Ofir Hershko, Bi Ho Jang, Jeong-Gyun Jang, Ueejeong Jeong, Andres Jordan, Colby Jurgenson, Jan Kansky, Jihun Kim, Sanghyuk Kim, Yunjong Kim, Sungho Lee, Henrique Lupinari, Jared Males, Kenneth McCracken, Michael McQuade, Claudia Mendes de Oliveira, Rafael Millan-Gabet, Mark Mueller, Jae Sok Oh, Cem Onyuksel, Byeong-Gon Park, Sung-Joon Park, Priscila Pires, William Podgorski, Andreas Seifahrt, Matthew Smith, Joao Steiner, Alan Uomoto, Young-Sam Yu, Joseph Zajac, Rafael Brahm

Proceedings Volume 12184, 121841N (2022) https://doi.org/10.1117/12.2629045

KEYWORDS: Telescopes, Spectrographs, Exoplanets, Stars, Optical instrument design, Spectral resolution, Velocity measurements, Sun, Solar system, Oxygen

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Proceedings Article | 11 July 2018 Paper

Detailed design of the G-CLEF flexure control camera subsystem

Jae Sok Oh, Chan Park, Kang-Min Kim, Moo-Young Chun, Young Sam Yu, Sungho Lee, Jihun Kim, Ueejeong Jeong, Chang-Hee Kim, Andrew Szentgyorgyi, Stuart McMuldroch, William Podgorski, Ian Evans, Mark Mueller, Alan Uomoto, Jeffrey Crane, Tyson Hare

Proceedings Volume 10702, 107028X (2018) https://doi.org/10.1117/12.2311908

KEYWORDS: Optical benches, Collimators, Cameras, Mirrors, Optical filtering, Sensors, Stars, CCD cameras, Space telescopes, Telescopes

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Proceedings Article | 6 July 2018 Presentation + Paper

The GMT-consortium large earth finder (G-CLEF): an optical echelle spectrograph for the Giant Magellan Telescope (GMT)

Andrew Szentgyorgyi, Daniel Baldwin, Stuart Barnes, Jacob Bean, Sagi Ben-Ami, Patricia Brennan, Jamie Budynkiewicz, Daniel Catropa, Moo-Young Chun, Charlie Conroy, Adam Contos, Jeffrey Crane, Daniel Durusky, Harland Epps, Ian Evans, Janet Evans, Valery Fishman, Anna Frebel, Thomas Gauron, Dani Guzman, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Andres Jordan, Jihun Kim, Kang-Min Kim, Yunjong Kim, Sungho Lee, Mercedes Lopez-Morales, Claudia Mendes de Oliveira, Kenneth McCracken, Stuart McMuldroch, Joseph Miller, Mark Mueller, Jae Sok Oh, Cem Onyuksel, Byeong-Gon Park, Chan Park, Sung-Joon Park, Charles Paxson, David Phillips, David Plummer, William Podgorski, Adam Rubin, Andreas Seifahrt, Daniel Stark, Joao Steiner, Alan Uomoto, Ronald Walsworth, Young-Sam Yu

Proceedings Volume 10702, 107021R (2018) https://doi.org/10.1117/12.2313539

KEYWORDS: Spectrographs, Cameras, Calibration, Telescopes, Stars, Optical benches, Thorium

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Proceedings Article | 19 September 2017 Presentation

Development of the camera lens system for total solar eclipse observation (Conference Presentation)

Jihun Kim, Seonghwan Choi, Ji-Hye Beck, Jongyeob Park, Su-Chan Bong, Bi-Ho Jang, Heesu Yang, Jinho Kim, Geon-Hee Kim, Kyungsuk Cho, Sung-Joon Park

Proceedings Volume 10401, 104010Q (2017) https://doi.org/10.1117/12.2272190

KEYWORDS: Cameras, Imaging systems, Polarizers, Bandpass filters, CCD cameras, Astronomy, Coronagraphy, Image quality, Optical engineering, Analytical research

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Proceedings Article | 9 August 2016 Paper

The opto-mechanical design of the GMT-Consortium Large Earth Finder (G-CLEF)

Mark Mueller, Andrew Szentgyorgyi, Daniel Baldwin, Jacob Bean, Sagi Ben-Ami, Patricia Brennan, J. Budynkiewicz, Moo-Yung Chun, Jeffrey Crane, Harland Epps, Ian Evans, Janet Evans, Jeff Foster, Anna Frebel, Thomas Gauron, Alex Glenday, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Andreas Jordan, Jihun Kim, Kang-Min Kim, Claudia Mendes de Oliveira, Mercedes Lopez-Morales, Kenneth McCracken, Stuart McMuldroch, Joseph Miller, Jae Sok Oh, Cem Onyuksel, Mark Ordway, Chan Park, Sung-Joon Park, Charles Paxson, David Phillips, David Plummer, William Podgorski, Andreas Seifahrt, Joao Steiner, Alan Uomoto, Ronald Walsworth, Young-Sam Yu

Proceedings Volume 9908, 9908A2 (2016) https://doi.org/10.1117/12.2233246

KEYWORDS: Spectrographs, Telescopes, Optical mounts, Space telescopes, Cameras, Calibration, Temperature metrology, Control systems, Mirrors, Optical benches

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The GMT-Consortium Large Earth Finder (G-CLEF) is a fiber-fed, optical echelle spectrograph selected as the first light instrument for the Giant Magellan Telescope (GMT) now under construction at the Las Campanas Observatory in Chile. G-CLEF has been designed to be a general-purpose echelle spectrograph with precision radial velocity (PRV) capability for exoplanet detection. The radial velocity (RV) precision goal of G-CLEF is 10 cm/sec, necessary for detection of Earth-sized exoplanets. This goal imposes challenging stability requirements on the optical mounts and the overall spectrograph support structures especially when considering the instrument’s operational environment. The accuracy of G-CLEF’s PRV measurements will be influenced by minute changes in temperature and ambient air pressure as well as vibrations and micro gravity-vector variations caused by normal telescope slewing. For these reasons we have chosen to enclose G-CLEF’s spectrograph in a well-insulated, vibration isolated vacuum chamber in a gravity invariant location on GMT’s azimuth platform. Additional design constraints posed by the GMT telescope include: a limited space envelope, a thermal emission ceiling, and a maximum weight allowance. Other factors, such as manufacturability, serviceability, available technology and budget are also significant design drivers. All of the above considerations must be managed while ensuring performance requirements are achieved. In this paper, we discuss the design of G-CLEF’s optical mounts and support structures including the choice of a low coefficient of thermal expansion (CTE) carbon-fiber optical bench to minimize the system’s sensitivity to thermal soaks and gradients. We discuss design choices made to the vacuum chamber geared towards minimize the influence of daily ambient pressure variations on image motion during observation. We discuss the design of G-CLEF’s insulated enclosure and thermal control systems which will maintain the spectrograph at milli-Kelvin level stability while simultaneously limiting thermal emissions into the telescope dome. Also discussed are micro gravity-vector variations caused by normal telescope slewing, their uncorrected influence on image motion, and how they are dealt with in the design. Finally, we discuss G-CLEF’s front-end assembly and fiber-feed system as well as other interface challenges presented by the telescope, enclosure and neighboring instrumentation.

Proceedings Article | 9 August 2016 Paper

The GMT-Consortium Large Earth Finder (G-CLEF): an optical Echelle spectrograph for the Giant Magellan Telescope (GMT)

Andrew Szentgyorgyi, Daniel Baldwin, Stuart Barnes, Jacob Bean, Sagi Ben-Ami, Patricia Brennan, Jamie Budynkiewicz, Moo-Young Chun, Charlie Conroy, Jeffrey Crane, Harland Epps, Ian Evans, Janet Evans, Jeff Foster, Anna Frebel, Thomas Gauron, Dani Guzmán, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Andres Jordan, Jihun Kim, Kang-Miin Kim, Claudia Mendes Mendes de Oliveira, Mercedes Lopez-Morales, Kenneth McCracken, Stuart McMuldroch, Joseph Miller, Mark Mueller, Jae Sok Oh, Cem Onyuksel, Mark Ordway, Byeong-Gon Park, Chan Park, Sung-Joon Park, Charles Paxson, David Phillips, David Plummer, William Podgorski, Andreas Seifahrt, Daniel Stark, Joao Steiner, Alan Uomoto, Ronald Walsworth, Young-Sam Yu

Proceedings Volume 9908, 990822 (2016) https://doi.org/10.1117/12.2233506

KEYWORDS: Spectrographs, Telescopes, Cameras, Calibration, Lamps, Interfaces, Fiber science, Light sources, Optical design, Mirrors

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Proceedings Article | 9 August 2016 Paper

Opto-mechanical design of the G-CLEF flexure control camera system

Jae Sok Oh, Chan Park, Jihun Kim, Kang-Min Kim, Moo-Young Chun, Young Sam Yu, Sungho Lee, Jakyoung Nah, Sung-Joon Park, Andrew Szentgyorgyi, Stuart McMuldroch, Timothy Norton, William Podgorski, Ian Evans, Mark Mueller, Alan Uomoto, Jeffrey Crane, Tyson Hare

Proceedings Volume 9908, 99089M (2016) https://doi.org/10.1117/12.2232147

KEYWORDS: Cameras, Mirrors, Telescopes, Sensors, Lenses, Collimators, Space telescopes, CCD cameras, Optical filters, Prisms

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Proceedings Article | 22 July 2016 Paper

Advanced structural design for precision radial velocity instruments

Dan Baldwin, Andrew Szentgyorgyi, Stuart Barnes, Jacob Bean, Sagi Ben-Ami, Patricia Brennan, Jamie Budynkiewicz, Moo-Young Chun, Charlie Conroy, Jeffrey Crane, Harland Epps, Ian Evans, Janet Evans, Jeff Foster, Anna Frebel, Thomas Gauron, Dani Guzman, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Andres Jordan, Jihun Kim, Kang-Min Kim, Claudia Mendes de Oliveira, Mercedes Lopez-Morales, Kenneth McCracken, Stuart McMuldroch, Joseph Miller, Mark Mueller, Jae Sok Oh, Mark Ordway, Byeong-Gon Park, Chan Park, Sung-Joon Park, Charles Paxson, David Phillips, David Plummer, William Podgorski, Andreas Seifahrt, Daniel Stark, Joao Steiner, Alan Uomoto, Ronald Walsworth, Young-Sam Yu

Proceedings Volume 9912, 99123I (2016) https://doi.org/10.1117/12.2235250

KEYWORDS: Optical benches, Spectrographs, Optical design, Composites, Telescopes, Structural design, Finite element methods, Thermography, Sensors, Optical components

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The GMT-Consortium Large Earth Finder (G-CLEF) is an echelle spectrograph with precision radial velocity (PRV) capability that will be a first light instrument for the Giant Magellan Telescope (GMT). G-CLEF has a PRV precision goal of 40 cm/sec (10 cm/s for multiple measurements) to enable detection of Earth-like exoplanets in the habitable zones of sun-like stars¹. This precision is a primary driver of G-CLEF’s structural design. Extreme stability is necessary to minimize image motions at the CCD detectors. Minute changes in temperature, pressure, and acceleration environments cause structural deformations, inducing image motions which degrade PRV precision. The instrument’s structural design will ensure that the PRV goal is achieved under the environments G-CLEF will be subjected to as installed on the GMT azimuth platform, including:

Millikelvin (0.001 °K) thermal soaks and gradients

10 millibar changes in ambient pressure

Changes in acceleration due to instrument tip/tilt and telescope slewing Carbon fiber/cyanate composite was selected for the optical bench structure in order to meet performance goals. Low coefficient of thermal expansion (CTE) and high stiffness-to-weight are key features of the composite optical bench design. Manufacturability and serviceability of the instrument are also drivers of the design.

In this paper, we discuss analyses leading to technical choices made to minimize G-CLEF’s sensitivity to changing environments. Finite element analysis (FEA) and image motion sensitivity studies were conducted to determine PRV performance under operational environments. We discuss the design of the optical bench structure to optimize stiffness-to-weight and minimize deformations due to inertial and pressure effects. We also discuss quasi-kinematic mounting of optical elements and assemblies, and optimization of these to ensure minimal image motion under thermal, pressure, and inertial loads expected during PRV observations.

Proceedings Article | 17 September 2015 Paper

Development of a FSMP mirror assembly

Jihun Kim, Young-Soo Kim, Je Heon Song, Myung Cho, Ho-Soon Yang, Joohyung Lee, Ho-Sang Kim, Kyoung-Don Lee, Won Hyun Park, Byeong-Gon Park

Proceedings Volume 9582, 95820K (2015) https://doi.org/10.1117/12.2191184

KEYWORDS: Mirrors, Secondary tip-tilt mirrors, Space telescopes, Telescopes, Adhesives, System integration, Tolerancing, Standards development, Astronomy, Prototyping

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Proceedings Article | 28 July 2014 Paper

A preliminary design for the GMT-Consortium Large Earth Finder (G-CLEF)

Andrew Szentgyorgyi, Stuart Barnes, Jacob Bean, Bruce Bigelow, Antonin Bouchez, Moo-Young Chun, Jeffrey Crane, Harland Epps, Ian Evans, Janet Evans, Anna Frebel, Gabor Furesz, Alex Glenday, Dani Guzman, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Ueejong Jeong, Andres Jordan, Kang-Min Kim, Jihun Kim, Chih-Hao Li, Mercedes Lopez-Morales, Kenneth McCracken, Brian McLeod, Mark Mueller, Jakyung Nah, Timothy Norton, Heeyoung Oh, Jae Sok Oh, Mark Ordway, Byeong-Gon Park, Chan Park, Sung-Joon Park, David Phillips, David Plummer, William Podgorski, Florian Rodler, Andreas Seifahrt, Kyung-Mo Tak, Alan Uomoto, Marcos Van Dam, Ronald Walsworth, Young Sam Yu, In-Soo Yuk

Proceedings Volume 9147, 914726 (2014) https://doi.org/10.1117/12.2056741

KEYWORDS: Spectrographs, Telescopes, Stars, Mirrors, Calibration, Exoplanets, Adaptive optics, Cameras, Interfaces, Optical design

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Proceedings Article | 22 July 2010 Paper

Testing and alignment of the LBTI

Jihun Kim, Philip Hinz, Olivier Durney, Tom Connors, Manny Montoya, Christian Schwab

Proceedings Volume 7734, 77341W (2010) https://doi.org/10.1117/12.857342

KEYWORDS: Stars, Device simulation, Telescopes, Fiber couplers, Chromatic aberrations, Glasses, Lens design, Laser sources, Geometrical optics, Fringe analysis

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Proceedings Article | 28 July 2008 Paper

Status of the LBT interferometer

Philip Hinz, Teresa Bippert-Plymate, Andy Breuninger, Tom Connors, Brian Duffy, Simone Esposito, William Hoffmann, Jihun Kim, Joe Kraus, Thomas McMahon, Manny Montoya, Richard Nash, Olivier Durney, Elliott Solheid, Andrea Tozzi, Vidhya Vaitheeswaran

Proceedings Volume 7013, 701328 (2008) https://doi.org/10.1117/12.790211

KEYWORDS: Mirrors, Interferometers, Telescopes, Cameras, Observatories, Infrared radiation, Imaging systems, Wavefront sensors, Ferroelectric materials, Infrared imaging

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