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Proceedings Paper

Image quality with array spectrometers
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Paper Abstract

We present data on the image quality achieved with the near IR array spectrometer cooled grating spectrometer 4 (CGS4) on the UK IR telescope (UKIRT) on Mauna Kea. A design spot size of 30 micrometers was specified for CGS4, to maintain acceptable image quality with both the 58 by 62 pixel array with which it is currently equipped and the 256 by 256 array which CGS4 was also designed to accommodate. Details are given of the design, construction and alignment method which allow linear tolerances of 50 micrometers and angular tolerances of 25 mrad to be met and maintained at cryogenic temperatures. The instrumental flexure is also discussed. Both laboratory spectra and those taken at the telescope illustrate that design spot sizes of 30 micrometers have been achieved in the near IR. It will be demonstrated that the theoretical resolution of the instrument is attained for resolving powers from approximately 200 to 20,000.

Paper Details

Date Published: 1 June 1994
PDF: 12 pages
Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); doi: 10.1117/12.176760
Show Author Affiliations
Suzanne K. Ramsay-Howat, Royal Observatory Edinburgh (United Kingdom)
Gillian S. Wright, Joint Astronomy Ctr. (United Kingdom)
C. Matt Mountain, Gemini 8-m Telescopes Project (United States)
David Montgomery, Gemini 8-m Telescopes Project (United States)
Eli Ettedgui-Atad, Royal Observatory Edinburgh (United Kingdom)


Published in SPIE Proceedings Vol. 2198:
Instrumentation in Astronomy VIII
David L. Crawford; Eric R. Craine, Editor(s)

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