Dr. Kyohoon Ahn
Adaptive Optics Scientist at Korea Astronomy and Space Science Institute (KASI)
SPIE Involvement:
Author
Publications (43)

Proceedings Article | 30 September 2024 Presentation + Paper
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

Proceedings Article | 16 September 2024 Poster + Paper
Proceedings Volume 13095, 130952M (2024) https://doi.org/10.1117/12.3019296
KEYWORDS: Planets, Stars, Monte Carlo methods, Diffraction limit, Protactinium, Adaptive optics, Observational astronomy, Telescopes, Electric fields, Solar system

Proceedings Article | 13 September 2024 Presentation + Paper
Proceedings Volume 13097, 130972G (2024) https://doi.org/10.1117/12.3019419
KEYWORDS: Adaptive optics, Wavefronts, Wavefront sensors, Interferometry, Telescopes, Photons, Point spread functions, Sensors, Design, Calibration

Proceedings Article | 12 September 2024 Poster + Paper
Proceedings Volume 13097, 130977I (2024) https://doi.org/10.1117/12.3019513
KEYWORDS: Planets, Stars, Astrometry, Exoplanets, Adaptive optics, Coronagraphy, Atmospheres, Telescopes, Stellar astronomy, Physics

Proceedings Article | 28 August 2024 Presentation + Paper
Proceedings Volume 13095, 130950T (2024) https://doi.org/10.1117/12.3019017
KEYWORDS: Photonics, High angular resolution imaging, Astronomical spectroscopy, Optical fibers, Single mode fibers, Telescopes, Spectral response, Spatial resolution, Calibration, Analytic models, Spectral resolution, Point spread functions, Turbulence

Proceedings Article | 28 August 2024 Presentation + Paper
Eckhart Spalding, Elizabeth Arcadi, Glen Douglass, Simon Gross, Olivier Guyon, Marc-Antoine Martinod, Barnaby Norris, Stephanie Rossini-Bryson, Adam Taras, Peter Tuthill, Kyohoon Ahn, Vincent Deo, Mona El Morsy, Julien Lozi, Sebastien Vievard, Michael Withford
Proceedings Volume 13095, 1309507 (2024) https://doi.org/10.1117/12.3016348
KEYWORDS: Waveguides, Telescopes, Nulling interferometry, Equipment, Stars, Phase shifts, Imaging systems, Design, Photonics, Glasses

Proceedings Article | 28 August 2024 Presentation + Paper
Lucinda Lilley, Barnaby Norris, Peter Tuthill, Eckhart Spalding, Miles Lucas, Manxuan Zhang, Michael Bottom, Maxwell Millar-Blanchaer, Boris Safonov, Olivier Guyon, Julien Lozi, Vincent Deo, Sébastien Vievard, Kyohoon Ahn, Jaren Ashcraft
Proceedings Volume 13095, 1309510 (2024) https://doi.org/10.1117/12.3018210
KEYWORDS: Polarimetry, Machine learning, Reconstruction algorithms, Physics, Optical interferometry, Astronomical interferometry, Interferometry, Visibility

Proceedings Article | 28 August 2024 Poster + Paper
Stephanie Rossini-Bryson, Barnaby Norris, Julien Lozi, Vincent Deo, Marc-Antoine Martinod, Eckhart Spalding, Elizabeth Arcadi, Glen Douglass, Sebastien Vievard, Kyohoon Ahn, Michael Withford, Mona El Morsy, Simon Gross, Olivier Guyon, Peter Tuthill
Proceedings Volume 13095, 130951Y (2024) https://doi.org/10.1117/12.3019348
KEYWORDS: Equipment, Photonics, Nulling interferometry

Proceedings Article | 28 August 2024 Presentation
Proceedings Volume 13095, 1309508 (2024) https://doi.org/10.1117/12.3018406

Proceedings Article | 28 August 2024 Poster
Proceedings Volume 13097, 130974O (2024) https://doi.org/10.1117/12.3020601

Proceedings Article | 28 August 2024 Presentation
Proceedings Volume 13097, 130971D (2024) https://doi.org/10.1117/12.3019308

Proceedings Article | 28 August 2024 Presentation
Kyohoon Ahn, Olivier Guyon, Julien Lozi, Sebastien Vievard, Vincent Deo, Michael Bottom, Yoshito Ono, Yusuke Minowa, Takashi Hattori, Yutaka Hayano, Miles Lucas, Manon Lallement
Proceedings Volume 13097, 1309704 (2024) https://doi.org/10.1117/12.3018445

Proceedings Article | 27 August 2024 Paper
Lucie Leboulleux, Olivier Guyon, Julien Lozi, Miles Lucas, Sébastien Vievard, Vincent Deo, Kyohoon Ahn, Alexis Carlotti, Alain Delboulbé, Mamadou N'Diaye, Marie-Hélène Sztefek, Philippe Delorme
Proceedings Volume 13097, 130973G (2024) https://doi.org/10.1117/12.3019775
KEYWORDS: Exoplanets, Wavefront aberrations, Coronagraphy, Telescopes, Design, Large telescopes

Proceedings Article | 27 August 2024 Presentation + Paper
Proceedings Volume 13097, 1309703 (2024) https://doi.org/10.1117/12.3019294
KEYWORDS: Wavefront sensors, Near infrared, Adaptive optics, Actuators, Point spread functions, Equipment, Telescopes, Stars, Real-time computing, Cameras

Proceedings Article | 26 August 2024 Paper
Elizabeth Arcadi, Glen Douglass, Jacinda Webb, Guillaume Tremblier, Barnaby Norris, Peter Tuthill, Stephanie Rossini-Bryson, Eckhart Spalding, Marc-Antonie Martinod, Mona El Morsy, Julien Lozi, Vincent Deo, Kyohoon Ahn, Sebastien Vievard, Olivier Guyon, Michael Withford, Simon Gross
Proceedings Volume 13100, 131006J (2024) https://doi.org/10.1117/12.3018755
KEYWORDS: Waveguides, Nulling interferometry, Polarization, Fabrication, Telescopes, Laser interferometry, Light wave propagation, Adaptive optics

Proceedings Article | 26 August 2024 Presentation + Paper
Elizabeth Arcadi, Glen Douglass, Jacinda Webb, Guillaume Tremblier, Barnaby Norris, Peter Tuthill, Stephanie Rossini-Bryson, Eckhart Spalding, Marc-Antonie Martinod, Mona El Morsy, Julien Lozi, Vincent Deo, Kyohoon Ahn, Sebastien Vievard, Olivier Guyon, Michael Withford, Simon Gross
Proceedings Volume 13100, 131002L (2024) https://doi.org/10.1117/12.3018600
KEYWORDS: Waveguides, Beam combiners, Integrated optics, Nulling interferometry, Design, Fabrication, Photometry, Interferometry

Proceedings Article | 23 August 2024 Presentation + Paper
Kenta Yoneta, Jun Nishikawa, Yutaka Hayano, Masatsugu Iribe, Kodai Yamamoto, Ryo Tsukui, Naoshi Murakami, Mizuki Asano, Yosuke Tanaka, Motohide Tamura, Takahiro Sumi, Toru Yamada, Olivier Guyon, Julien Lozi, Vincent Deo, Sébastien Vievard, Kyohoon Ahn
Proceedings Volume 13092, 1309225 (2024) https://doi.org/10.1117/12.3019597
KEYWORDS: Spatial light modulators, Wavefronts, Field programmable gate arrays, Telescopes, Speckle, Exoplanets, Imaging systems, Wavefront sensors

Proceedings Article | 20 August 2024 Poster + Paper
Miles Lucas, Barnaby Norris, Olivier Guyon, Michael Bottom, Vincent Deo, Sébastien Vievard, Julien Lozi, Kyohoon Ahn, Jaren Ashcraft, Thayne Currie, David Doelman, Tomoyuki Kudo, Lucinda Lilley, Lucie Leboulleux, Maxwell Millar-Blanchaer, Boris Safonov, Peter Tuthill, Taichi Uyama, Aidan Walk, Manxuan Zhang
Proceedings Volume 13096, 130962Z (2024) https://doi.org/10.1117/12.3016188
KEYWORDS: Polarimetry, Sensors, Coronagraphy, High dynamic range imaging, Equipment, Stars, Polarization, Adaptive optics, Neptune, Multispectral imaging

Proceedings Article | 18 July 2024 Poster + Paper
Proceedings Volume 13096, 130966S (2024) https://doi.org/10.1117/12.3019179
KEYWORDS: Exoplanets, Spectrographs, Telescopes, Adaptive optics, Planets, Equipment, Single mode fibers, Wavefront sensors, Near infrared, Cameras

Proceedings Article | 18 July 2024 Presentation + Paper
S. Vievard, M. Lallement, S. Leon-Saval, O. Guyon, N. Jovanovic, E. Huby, S. Lacour, J. Lozi, V. Deo, K. Ahn, M. Lucas, T. Currie, S. Sallum, M. Fitzgerald, C. Betters, B. Norris, R. Amezcua-Correa, S. Yerolatsitis, J. Lin, Y. Kim, P. Gatkine, T. Kotani, M. Tamura, G. Martin, H. Kenchington Goldsmith, G. Perrin
Proceedings Volume 13096, 130960P (2024) https://doi.org/10.1117/12.3018031
KEYWORDS: Single mode fibers, Telescopes, Visible radiation, Spectroscopes, Spectrographs, Calibration, Equipment, Spatial resolution, Imaging spectroscopy, Adaptive optics

Proceedings Article | 5 October 2023 Presentation + Paper
Proceedings Volume 12680, 126800B (2023) https://doi.org/10.1117/12.2676667
KEYWORDS: Wavefront sensors, Reconstruction algorithms, Wavefront reconstruction, Spatial light modulators, Telescopes, Adaptive optics

Proceedings Article | 5 October 2023 Presentation + Paper
Kenta Yoneta, Jun Nishikawa, Yutaka Hayano, Masatsugu Iribe, Kodai Yamamoto, Ryo Tsukui, Naoshi Murakami, Mizuki Asano, Hiromu Muramatsu, Yosuke Tanaka, Motohide Tamura, Takahiro Sumi, Toru Yamada, Olivier Guyon, Julien Lozi, Vincent Deo, Sébastien Vievard, Kyohoon Ahn
Proceedings Volume 12680, 126800D (2023) https://doi.org/10.1117/12.2676294
KEYWORDS: Modulation, Coherence imaging, Speckle, Electric fields, Equipment, Wavefronts, Telescopes, Optical coherence, Exoplanets

Proceedings Article | 5 October 2023 Presentation + Paper
Proceedings Volume 12680, 126801G (2023) https://doi.org/10.1117/12.2677806
KEYWORDS: Coronagraphy, Calibration, Matrices, Wavefront sensors, Cameras, Actuators, Stars, Wavefronts, Wavefront errors, Singular value decomposition

Proceedings Article | 5 October 2023 Presentation + Paper
Proceedings Volume 12680, 126800H (2023) https://doi.org/10.1117/12.2676319
KEYWORDS: Telescopes, Single mode fibers, Optical path differences, Spectrographs, Photonic integrated circuits, Polarization, Microelectromechanical systems, Calibration, Visible radiation

Proceedings Article | 30 August 2022 Poster + Paper
Sebastiaan Haffert, Jared Males, Kyle Van Gorkom, Laird Close, Joseph Long, Alexander Hedglen, Kyohoon Ahn, Olivier Guyon, Lauren Schatz, Maggie Kautz, Jennifer Lumbres, Alexander Rodack, Justin Knight, He Sun, Kevin Fogarty, Kelsey Miller
Proceedings Volume 12185, 1218581 (2022) https://doi.org/10.1117/12.2630425
KEYWORDS: Wavefront sensors, Planets, Adaptive optics, Coronagraphy, Exoplanets, Autoregressive models

Proceedings Article | 30 August 2022 Poster + Paper
Proceedings Volume 12185, 121856J (2022) https://doi.org/10.1117/12.2630534
KEYWORDS: Adaptive optics, Telescopes, Near infrared, Wavefront sensors, Imaging systems, Astronomy, Spectrographs, Infrared telescopes, Exoplanets, Coronagraphy

Proceedings Article | 30 August 2022 Presentation + Paper
Proceedings Volume 12185, 1218533 (2022) https://doi.org/10.1117/12.2630634
KEYWORDS: Near infrared, Modulation, Beam splitters, Adaptive optics, Cameras, Stars, Wavefront sensors, Signal to noise ratio, Telescopes, Modulators

Proceedings Article | 30 August 2022 Presentation + Paper
Proceedings Volume 12185, 121851U (2022) https://doi.org/10.1117/12.2630732
KEYWORDS: Adaptive optics, Wavefronts, Coronagraphy, Spatial frequencies, Fourier transforms, Wavefront sensors, Point spread functions, Imaging systems, Speckle, Telescopes

Proceedings Article | 30 August 2022 Presentation + Paper
Olivier Guyon, Barnaby Norris, Marc-Antoine Martinod, Kyohoon Ahn, Vincent Deo, Nour Skaf, Julien Lozi, Sébastien Vievard, Sebastiaan Haffert, Thayne Currie, Jared Males, Alison Wong, Peter Tuthill
Proceedings Volume 12185, 121850E (2022) https://doi.org/10.1117/12.2630503
KEYWORDS: Point spread functions, Calibration, Speckle, Wavefronts, Telescopes, Imaging systems, Planets, Photonics, Coronagraphy, Stars

Proceedings Article | 30 August 2022 Presentation + Paper
Alison Wong, Barnaby R. Norris, Vincent Deo, Olivier Guyon, Peter Tuthill, Julien Lozi, Sébastien Vievard, Kyohoon Ahn
Proceedings Volume 12185, 121852I (2022) https://doi.org/10.1117/12.2628869
KEYWORDS: Neural networks, Wavefront sensors, Wavefronts, Adaptive optics, Wavefront reconstruction, Sensors

Proceedings Article | 30 August 2022 Presentation + Paper
V. Deo, S. Vievard, N. Cvetojevic, K. Ahn, E. Huby, O. Guyon, S. Lacour, J. Lozi, F. Martinache, B. Norris, N. Skaf, P. Tuthill
Proceedings Volume 12185, 121850Z (2022) https://doi.org/10.1117/12.2629865
KEYWORDS: Adaptive optics, Wavefront sensors, Telescopes, Astronomical interferometry

Proceedings Article | 30 August 2022 Presentation + Paper
K. Ahn, O. Guyon, J. Lozi, S. Vievard, V. Deo, N. Skaf, J. Bragg, S. Haffert, J. Males, T. Currie
Proceedings Volume 12185, 121852B (2022) https://doi.org/10.1117/12.2627346
KEYWORDS: Coronagraphy, Adaptive optics, Telescopes, Wavefronts, Exoplanets, Wavefront sensors

Proceedings Article | 29 August 2022 Poster + Paper
Miles Lucas, Michael Bottom, Olivier Guyon, Julien Lozi, Barnaby Norris, Vincent Deo, Sébastien Vievard, Kyohoon Ahn, Nour Skaf, Peter Tuthill
Proceedings Volume 12184, 121844E (2022) https://doi.org/10.1117/12.2632269
KEYWORDS: Coronagraphy, Point spread functions, Wavefronts, Satellites, Exoplanets, Calibration, Photometry, Stars, Adaptive optics, Telescopes

Proceedings Article | 29 August 2022 Presentation
Proceedings Volume 12185, 121850W (2022) https://doi.org/10.1117/12.2629122
KEYWORDS: Telescopes, Sensors, Large telescopes, Wavefront sensors, Thirty Meter Telescope, Segmented mirrors, Exoplanets, Cameras, Analytical research, Adaptive optics

Proceedings Article | 29 August 2022 Presentation
Proceedings Volume 12183, 121830R (2022) https://doi.org/10.1117/12.2629299
KEYWORDS: Interferometry, Wavefront sensors, Telescopes, Metrology, Laser sources, Calibration, Spatial resolution, Optical fibers, Imaging systems, Coronagraphy

Proceedings Article | 29 October 2021 Presentation + Paper
Proceedings Volume 11823, 1182319 (2021) https://doi.org/10.1117/12.2595008
KEYWORDS: Coronagraphy, Adaptive optics, Point spread functions, Wavefronts, Cameras, Image quality, Telescopes, Wavefront sensors, Imaging systems, Computer simulations

Proceedings Article | 1 September 2021 Presentation + Paper
Proceedings Volume 11823, 118230C (2021) https://doi.org/10.1117/12.2594840
KEYWORDS: Telescopes, Wavefront sensors, Single mode fibers, Stars, Optical fibers, Interferometry, Diffraction, Wavefronts, Spatial resolution, Photonics

Proceedings Article | 1 September 2021 Presentation + Paper
V. Deo, S. Vievard, N. Cvetojevic, B. Norris, O. Guyon, J. Lozi, K. Ahn, E. Huby, S. Lacour, F. Martinache, N. Skaf, P. Tuthill
Proceedings Volume 11823, 118231A (2021) https://doi.org/10.1117/12.2594977
KEYWORDS: Adaptive optics, Wavefront sensors, Telescopes, Sensors, Interferometry, Photons, Imaging systems, Cameras

Proceedings Article | 1 September 2021 Presentation + Paper
Kyohoon Ahn, Olivier Guyon, Julien Lozi, Sébastien Vievard, Vincent Deo, Nour Skaf, Ruslan Belikov, Steven Bos, Michael Bottom, Thayne Currie, Richard Frazin, Kyle V. Gorkom, Tyler Groff, Sebastiaan Haffert, Nemanja Jovanovic, Hajime Kawahara, Takayuki Kotani, Jared Males, Frantz Martinache, Ben Mazin, Kelsey Miller, Barnaby Norris, Alexander Rodack, Alison Wong
Proceedings Volume 11823, 1182303 (2021) https://doi.org/10.1117/12.2594963
KEYWORDS: Coronagraphy, Telescopes, Human-computer interaction, Speckle, Stars, Adaptive optics, Visible radiation, Exoplanets, Wavefronts, Wavefront sensors

Proceedings Article | 1 September 2021 Presentation + Paper
Proceedings Volume 11823, 1182304 (2021) https://doi.org/10.1117/12.2595001
KEYWORDS: Stars, Planets, Exoplanets, Adaptive optics, Wavefronts, Wavefront sensors, Telescopes, Infrared imaging, Data processing, Photometry

Proceedings Article | 1 September 2021 Presentation + Paper
Proceedings Volume 11823, 1182318 (2021) https://doi.org/10.1117/12.2594885
KEYWORDS: Calibration, Wavefronts, Imaging systems, Wavefront sensors, Speckle, Planets, Sensors, Photonics, Waveguides, Telescopes

Proceedings Article | 9 August 2021 Presentation + Paper
Joost G. J. 't Hart, Rob G. van Holstein, Steven Bos, Jasper Ruigrok, Frans Snik, Julien Lozi, Olivier Guyon, Tomoyuki Kudo, Jin Zhang, Nemanja Jovanovic, Barnaby Norris, Marc-Antoine Martinod, Tyler D. Groff, Jeffrey Chilcote, Thayne Currie, Motohide Tamura, Sébastien Vievard, Ananya Sahoo, Vincent Deo, Kyohoon Ahn, Frantz Martinache, Jeremy Kasdin
Proceedings Volume 11833, 118330O (2021) https://doi.org/10.1117/12.2602859
KEYWORDS: Polarization, Mirrors, Telescopes, Calibration, Polarimetry, Data modeling, Refractive index, Polarizers, Instrument modeling

Proceedings Article | 11 July 2018 Paper
Proceedings Volume 10703, 1070377 (2018) https://doi.org/10.1117/12.2306766
KEYWORDS: Silicon carbide, Adaptive optics, Chemical vapor deposition, Deformable mirrors, Mirrors, Wavefront compensation

Showing 5 of 43 publications
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