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Proceedings Paper

Design for a 1--5-um cryogenic echelle spectrograph for the NASA IRTF
Author(s): Alan T. Tokunaga; Douglas W. Toomey; Jonathan B. Carr; Donald N. B. Hall; Harland W. Epps
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Paper Abstract

The design of an infrared cryogenic echelle spectrograph for use on the NASA Infrared Telescope Facility is described. The resolving power achieved over the range 1-5.4 microns is 1-40,000 with slit widths of 2.0-0.5 arcsec. The spectrograph is used in a single order with a 30-arcsec-long slit. No cross dispersion is provided because of the small number of orders that can be observed at once and the need to keep the instrument as small as possible. A closed-cycle cooler is used in lieu of cryogens in order to achieve greater reliability and ease of use at the telescope. The optical layout, the design philosophy, the modes of operation, and the construction details are provided.

Paper Details

Date Published: 1 July 1990
PDF: 13 pages
Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); doi: 10.1117/12.19082
Show Author Affiliations
Alan T. Tokunaga, Univ. of Hawaii/Manoa (United States)
Douglas W. Toomey, Univ. of Hawaii/Manoa (United States)
Jonathan B. Carr, Univ. of Hawaii/Manoa (United States)
Donald N. B. Hall, Univ. of Hawaii/Manoa (United States)
Harland W. Epps, Lick Observatory/Univ. of California, Santa Cruz (United States)


Published in SPIE Proceedings Vol. 1235:
Instrumentation in Astronomy VII
David L. Crawford, Editor(s)

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