Characterization of infrared polarizers

Details Characterization of infrared polarizers Characterization of infrared polarizers

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.3121..213n&link_type=abstract

Proc. SPIE Vol. 3121, p. 213-224, Polarization: Measurement, Analysis, and Remote Sensing, Dennis H. Goldstein; Russell A. Chipm

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Scientific paper

The three independent characteristics of a polarizer are transmittance, extinction ratio, and cross-polarized scattering. Extinction ratio, depolarization, incoherent near-specular scattering (NSS), and contrasts are mutually dependent. Spectra of transmittance, extinction ratio, depolarization, and contrast for wiregrid polarizers were measured in the 3- to 5-micrometers wavelength region using the zones average method developed in this paper. Good polarizers are hard to find in this region. By putting two polarizers in a series with the polarization axes parallel to each other, the extinction ratio can be improved greatly by the ratio of total NSS to cross-polarized NSS of the rear polarizer.

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