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Proceedings Paper

Comparison of commercially available polarizing gratings for mid-infrared studies
Author(s): Michelle J. Creech-Eakman; Thomas A. Leonard; Jason Geis; Eugene Serabyn
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Paper Abstract

We present the results of lab comparison tests of performance for several commercially available grating polarizers for use at mid-infrared wavelengths. The tests were done using a polarized laser diode source (9.2 $\mu$m) and photoconductive HgCdTe single pixel detector. We describe some basic equations governing quantification of polarization performance, our instrumental test setup and our results. There is a large difference in the contrast produced by polarizers from different companies. Availability of high-transmission, high-contrast polarizers for use at near and mid-infrared wavelengths will make it possible to routinely characterize polarization of astronomical sources, such as physical properties of dust grains and magnetic field lines around sources of interest. Such polarizers will also be valuable in the development of the instrumentation needed for infrared nulling interferometry.

Paper Details

Date Published: 14 February 2003
PDF: 7 pages
Proc. SPIE 4843, Polarimetry in Astronomy, (14 February 2003); doi: 10.1117/12.458650
Show Author Affiliations
Michelle J. Creech-Eakman, Jet Propulsion Lab. (United States)
Thomas A. Leonard, Leonard Research Corp. (United States)
Jason Geis, Jet Propulsion Lab (United States)
Eugene Serabyn, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 4843:
Polarimetry in Astronomy
Silvano Fineschi, Editor(s)

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