LEWIS--A Near-Infrared Cross-Dispersed Spectrograph

Details LEWIS--A Near-Infrared Cross-Dispersed Spectrograph LEWIS--A Near-Infrared Cross-Dispersed Spectrograph

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasp..108.1129i&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.108, p.1129-1134

Astronomy and Astrophysics

Astronomy

7

Scientific paper

LEWIS (L, M-band Echelle Wide coverage Intermediate-resolution Spectrometer) is an infrared spectrograph designed primarily for spectroscopy in the 2.0 - 5.0 micron region. It is capable of covering the whole L-band (2.8 micron - 4.2 micron) or M-band (4.5 micron - 5.0 micron) in one exposure with a resolving power over 1250 by using both a prism and a grating to produce a cross-dispersed echelle-type spectrogram onto a Santa Barbara Research Center (SBRC) 256X256 InSb array. The grating is characterized by a large groove of spacing of 125 microns and is utilized at very high orders (25th - 37th in the L-band). The achieved throughput of the spectrograph including the quantum efficiency of the detector is about 20%. (SECTION: Astronomical Instrumentation)

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