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Proceedings Paper

Cooled Grating Array Spectrometer For 0.6-5 Um
Author(s): J. E. Nordholt; J. H. Lacy
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Paper Abstract

A grating spectrometer, designed to illuminate an array of 122 InSb photodiodes with minimum aberrations and maximum speed, has been constructed. The instrument will be used on the 5 meter Hale telescope at Palomar Observatory, and is easily adaptable to telescopes of various focal ratios. A resolving power of 100-1000 can be obtained at wavelengths between 0.6 pm and 5 pm with remotely interchangeable gratings. The spectrometer is sufficiently compact to fit on the 8-inch work surface of a commercially available dewar, and uses simple on-axis spherical and paraboloidal optical elements. The camera mirror produces an f/2.5 beam which, with the 0.2 mm detectors, allows a 3" focal-plane aperture on the 5 meter telescope. All rays fall within a 100 μm blur circle at all points along the array. Distortions have been corrected with a tilted field flattening lens in front of the detector.

Paper Details

Date Published: 16 November 1982
PDF: 4 pages
Proc. SPIE 0331, Instrumentation in Astronomy IV, (16 November 1982); doi: 10.1117/12.933453
Show Author Affiliations
J. E. Nordholt, California Institute of Technology (United States)
J. H. Lacy, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 0331:
Instrumentation in Astronomy IV
David L. Crawford, Editor(s)

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