Design for a 1-5-micron cryogenic echelle spectrograph for the NASA IRTFThe 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.
Document ID
19910044992
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Tokunaga, A. T. (Hawaii Univ. Honolulu, HI, United States)
Toomey, D. W. (Hawaii Univ. Honolulu, HI, United States)
Carr, J. (Hawaii Univ. Honolulu, HI, United States)
Hall, D. N. B. (Hawaii, University Honolulu, United States)
Epps, H. W. (Lick Observatory Santa Cruz, CA, United States)