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Proceedings Paper

The optical design of the G-CLEF Spectrograph: the first light instrument for the GMT
Author(s): Sagi Ben-Ami; Harland Epps; Ian Evans; Mark Mueller; William Podgorski; Andrew Szentgyorgyi
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Paper Abstract

The GMT-Consortium Large Earth Finder (G-CLEF), the first major light instrument for the GMT, is a fiber-fed, high-resolution echelle spectrograph. In the following paper, we present the optical design of G-CLEF. We emphasize the unique solutions derived for the spectrograph fiber-feed: the Mangin mirror that corrects the cylindrical field curvature, the implementation of VPH grisms as cross dispersers, and our novel solution for a multi-colored exposure meter. We describe the spectrograph blue and red cameras comprised of 7 and 8 elements respectively, with one aspheric surface in each camera, and present the expected echellogram imaged on the instrument focal planes. Finally, we present ghost analysis and mitigation strategy that takes into account both single reflection and double reflection back scattering from various elements in the optical train.

Paper Details

Date Published: 9 August 2016
PDF: 16 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 9908A0 (9 August 2016); doi: 10.1117/12.2232854
Show Author Affiliations
Sagi Ben-Ami, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Harland Epps, Lick Observatory, Univ. of California, Santa Cruz (United States)
Ian Evans, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Mark Mueller, Harvard-Smithsonian Ctr. for Astrophysics (United States)
William Podgorski, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Andrew Szentgyorgyi, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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