Experimental results from using two laminated film polarizers to make absolute measurements of polarization crosstalk in an optic

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

In working with polarimeters, it is useful to be able to analyze the level of stress birefringence in the optics of the polarimeter individually. This birefringence shows up in the polarimeter as a conversion of linear polarization to circular polarization and vice versa. A method has been developed for using two, low-cost, laminated film polarizers to make measurements of linear-to-circular polarization conversion in sample optics. Measurements were made on several optical elements of the ESPaDOnS spectro-polarimeter during the effort to reduce the polarization crosstalk, as well as on a quarter-wave plate in order to calibrate the measurement.

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