Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4843..510c&link_type=abstract
Polarimetry in Astronomy. Edited by Silvano Fineschi . Proceedings of the SPIE, Volume 4843, pp. 510-516 (2003).
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Creech-Eakman Michelle J.
Geis Jason
Leonard Thomas A.
Serabyn Eugene
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