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Published June 1, 1994 | Published
Book Section - Chapter Open

Low-Resolution Imaging Spectrometer for the Keck Telescope


The Low Resolution Imaging Spectrometer is designed for use at the Cassegrain focus of the Keck 10-m telescope. It provides the capability of acquiring low resolution (R equals 1000 to 5000) digital spectra, as well as 6 X 8 arc-minute moderately high spatial resolution (4.65 pixels/arc-second) direct images. Spectroscopy can be carried out with single slits which are 3 arc-minutes long. In addition punched multi-slits can also be employed which allow for the acquisition of at least forty spectra simultaneously. Since the instrument is designed to be as efficient as possible, it is a double spectrograph, with a dichroic splitting the blue and red light into separate optical paths after the collimator. Only the red side has been constructed thus far. With a 2048 by 2048 thinned Tektronix CCD as the detector the total efficiency of the red side at the peak of the grating blaze is predicted to be nearly 40%. Results of the commissioning observing runs will be described.

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© 1994 The International Society for Optical Engineering, SPIE. This is one phase of work at the W.M. Keck Observatory, jointly operated by the California Institute of Technology and the University of California. We are greatful to Mr. Howard Keck for his magnificent gift in support of astronomy.

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August 20, 2023
August 20, 2023