Broadband polarization rotator for the infrared.
A three-mirror system is described which is capable of rotating the polarization angle of a beam through any angle from 0 degrees to 360 degrees , with the output beam line coaxial with the input beam. Calculations are made of metallic reflective phase shifts, from the midvisible through ir, showing that this rotator would introduce negligible elliptical polarization for wavelengths longer than about 5 microm.
Johnston
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