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Optical Engineering

Polarization Device For Improved Spectrograph Efficiency
Author(s): Peter L. Wizinowich
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Paper Abstract

Grating, and hence spectrograph efficiency, can be a strong function of the polarization of incident light. A polarization device has been designed to divide the light entering a spectrograph into two orthogonal polarizations, one of which is then rotated 90°, so that all of the light incident on the grating is polarized either parallel to or perpendicular to the grating grooves. Spectrograph throughput is thereby im-proved while also becoming independent of input polarization. Tests at the coude spectrograph of the Canada-France-Hawaii Telescope with an 830 f/mm grating revealed a 28% improvement in spectrograph throughput at a wavelength of 500 nm.

Paper Details

Date Published: 1 February 1989
PDF: 3 pages
Opt. Eng. 28(2) 282157 doi: 10.1117/12.7976923
Published in: Optical Engineering Volume 28, Issue 2
Show Author Affiliations
Peter L. Wizinowich, University of Arizona (United States)

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