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Proceedings Paper

The optical design of GMOX: a next-generation instrument concept for Gemini
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Paper Abstract

We present the optical design of GMOX, the Gemini Multi-Object eXtra-wide-band spectrograph. GMOX was selected as part of the Gemini Instrument Feasibility Study to develop capabilities and requirements for the next facility instrument (Gen4#3) for the observatory. We envision GMOX covering the entire optical/near-IR wavelength range accessible from the ground, from 3500 Å in the U band up to 2.4 μm in the K band, with nominal resolving power R≃5,000. To maximize efficiency, the bandpass is split into three spectrograph arms - blue, red, and near-infrared - with the near-infrared arm further split into three channels covering the Y+J, H, and K bands. At the heart of each arm is a Digital Micromirror Device (DMD) serving as a programmable slit array. This technology will enable GMOX to simultaneously acquire hundreds of spectra of faint sources in crowded fields with unparalleled spatial resolution, optimally adapting to both seeing-limited and diffraction limited conditions provided by ALTAIR and GeMS at Gemini North and South, respectively. Fed by GeMS at f/33, GMOX can synthesize slits as small as 40 mas (corresponding to a single HST/WFC3 CCD pixel) over its entire 85”x45” field of view. With either ALTAIR or the native telescope focal ratio of f/16, both the slit and field sizes double. In this paper we discuss the conceptual optical design of GMOX including, for each arm: the pre-slit optics, DMD slit array, off-axis Schmidt collimator, VPH grating, and refractive spectrograph and slit-viewing cameras.

Paper Details

Date Published: 19 August 2016
PDF: 17 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990852 (19 August 2016); doi: 10.1117/12.2233459
Show Author Affiliations
Robert Barkhouser, Johns Hopkins Univ. (United States)
Massimo Robberto, Johns Hopkins Univ. (United States)
Space Telescope Science Institute (United States)
Stephen A. Smee, Johns Hopkins Univ. (United States)
Zoran Ninkov, Rochester Institute of Technology (United States)
Mario Gennaro, Space Telescope Science Institute (United States)
Timothy Heckman, Johns Hopkins Univ. (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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