9 August 2016 The optical design of the G-CLEF Spectrograph: the first light instrument for the GMT
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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.
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Sagi Ben-Ami, Sagi Ben-Ami, Harland Epps, Harland Epps, Ian Evans, Ian Evans, Mark Mueller, Mark Mueller, William Podgorski, William Podgorski, Andrew Szentgyorgyi, Andrew Szentgyorgyi, "The optical design of the G-CLEF Spectrograph: the first light instrument for the GMT", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 9908A0 (9 August 2016); doi: 10.1117/12.2232854; https://doi.org/10.1117/12.2232854

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