GMTNIRS: preliminary optical design for the calibration system of a near-infrared spectrograph

Woojin Park; Heeyoung Oh; Ueejeong Jeong; Jeong-Gyun Jang; Bi-Ho Jang; Sungho Lee; Hanshin Lee; Sanghyuk Kim; Chan Park; Moo-Young Chun; John Good; Gregory Mace; Cynthia Brooks; Alycia J. Weinberger; Daniel T. Jaffe

doi:10.1117/12.3015785

18 July 2024 GMTNIRS: preliminary optical design for the calibration system of a near-infrared spectrograph

Woojin Park, Heeyoung Oh, Ueejeong Jeong, Jeong-Gyun Jang, Bi-Ho Jang, Sungho Lee, Hanshin Lee, Sanghyuk Kim, Chan Park, Moo-Young Chun, John Good, Gregory Mace, Cynthia Brooks, Alycia J. Weinberger, Daniel T. Jaffe

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130964T (2024) https://doi.org/10.1117/12.3015785
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We introduce an optical system design of the calibration system for Giant Magellan Telescope Near-Infrared Spectrograph (GMTNIRS), capable of operating across a wavelength range of 1.08 - 5.4 μm. The calibration system fulfills several critical functions, including flat-fielding, wavelength calibration, dark current measurements, and focusing of the spectrograph. The system consists of flat lamp collimator, illuminator, relay optics, and three targets – the USAF 1951 resolution target, a pinhole, and a dark mirror. The focal ratio of the output beam in image space is designed to be 8, replicating the Giant Magellan Telescope. The flatness of the light from the calibration system is evaluated using a non-sequential ray tracing method, confirming over 99% flatness across the slit area.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Woojin Park, Heeyoung Oh, Ueejeong Jeong, Jeong-Gyun Jang, Bi-Ho Jang, Sungho Lee, Hanshin Lee, Sanghyuk Kim, Chan Park, Moo-Young Chun, John Good, Gregory Mace, Cynthia Brooks, Alycia J. Weinberger, and Daniel T. Jaffe "GMTNIRS: preliminary optical design for the calibration system of a near-infrared spectrograph", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130964T (18 July 2024); https://doi.org/10.1117/12.3015785

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