LEWIS - A NEAR-INFRARED CROSS-DISPERSED SPECTROGRAPH

Citation
M. Imanishi et al., LEWIS - A NEAR-INFRARED CROSS-DISPERSED SPECTROGRAPH, Publications of the Astronomical Society of the Pacific, 108(730), 1996, pp. 1129-1134
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Publications of the Astronomical Society of the Pacific
ISSN journal
0004-6280 → ACNP
Volume
108
Issue
730
Year of publication
1996
Pages
1129 - 1134
Database
ISI
SICI code
0004-6280(1996)108:730<1129:L-ANCS>2.0.ZU;2-K
Abstract
LEWIS (L, M-band Echelle Wide coverage Intermediate-resolution Spectro meter) is an infrared spectrograph designed primarily for spectroscopy in the 2.0-5.0 mu m) region. It is capable of covering the whole L ba nd (2.8-4.2 mu m) or M band (4.5-5.0 mu m) in one exposure with a reso lving power over 1250 by using both a prism and a grating to produce a cross-dispersed echelle-type spectrogram onto a Santa Barbara Researc h Center (SBRC) 256x256 InSb array. The grating is characterized by a large groove spacing of 125 mu m and is utilized at very high orders ( 25th-37th order in the L band). The achieved throughput of the spectro graph including the quantum efficiency of the detector is about 20%.