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Proceedings Paper

Design of the Gemini near-infrared spectrometer
Author(s): Jonathan H. Elias; Daniel Vukobratovich; John R. Andrew; Myung K. Cho; Randy W. Cuberly; Ken Don; Allen Gerzoff; Charles F. W. Harmer; D. Harris; Julie B. Heynssens; J. Hicks; A. Kovacs; Cheng Li; M. Liang; Il-Kwon Moon; Earl T. Pearson; G. Plum; Nicolas A. Roddier; Janet E. Tvedt; Richard J. Wolff; Woon-Yin Wong
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Paper Abstract

The design of a near-IR spectrometer for the Gemini 8m telescopes is described. This instrument, GNIRS, provides coverage from 0.9 to 5.5 micrometers at several spectral resolutions and two pixel scales. Capabilities include an imaging mode intended primarily for acquisition, a cross- dispersed mode covering wavelengths from 0.9 to 2.5 micrometers , and provisions for an integral field unit. The design of the GNIRS is conservative, as it must meet tight schedule and resource constraints; it nonetheless provides high throughput and operational efficiency, minimal flexure, and the flexibility needed to support queue observing. The optics are a combination of diamond-turned metal optics for the fore-optics and collimator, and refractive optics for the cameras. The mechanism include a two-axis grating turret; all mechanism are deposited by means of internal detents. The instrument achieves low flexure within its weight budget by the use of a modular structure composed of cylindrical light-weighted sections into which individual mechanisms and optics modules are mounted. Extensive analyses of mechanical and optical performance have been performed. The GNIRS has passed its critical design review, and fabrication is now underway.

Paper Details

Date Published: 21 August 1998
PDF: 11 pages
Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); doi: 10.1117/12.317281
Show Author Affiliations
Jonathan H. Elias, National Optical Astronomy Observatories (United States)
Daniel Vukobratovich, National Optical Astronomy Observatories (United States)
John R. Andrew, National Optical Astronomy Observatories (United States)
Myung K. Cho, Optical Sciences Ctr./Univ. of Arizona (United States)
Randy W. Cuberly, National Optical Astronomy Observatories (United States)
Ken Don, National Optical Astronomy Observatories (United States)
Allen Gerzoff, National Optical Astronomy Observatories (United States)
Charles F. W. Harmer, National Optical Astronomy Observatories (United States)
D. Harris, National Optical Astronomy Observatories (United States)
Julie B. Heynssens, National Optical Astronomy Observatories (United States)
J. Hicks, National Optical Astronomy Observatories (United States)
A. Kovacs, National Optical Astronomy Observatories (United States)
Cheng Li, National Optical Astronomy Observatories (United States)
M. Liang, National Optical Astronomy Observatories (United States)
Il-Kwon Moon, Univ. of Arizona (South Korea)
Earl T. Pearson, National Optical Astronomy Observatories (United States)
G. Plum, National Optical Astronomy Observatories (United States)
Nicolas A. Roddier, National Optical Astronomy Observatories (United States)
Janet E. Tvedt, National Optical Astronomy Observatories (United States)
Richard J. Wolff, National Optical Astronomy Observatories (United States)
Woon-Yin Wong, National Optical Astronomy Observatories (United States)


Published in SPIE Proceedings Vol. 3354:
Infrared Astronomical Instrumentation
Albert M. Fowler, Editor(s)

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