Abstract
The polarization distortions of radiation, which arise when it passes through optical elements cut from uniaxial crystals in the regime of strong thermally induced birefringence, are studied. The presented theoretical description of the effect convincingly corresponds to the results of the experiment carried out for verification purposes. The problem of the existence of critical orientations of crystallographic axes in an optical element, at which polarization distortions do not occur, is studied for uniaxial crystals of all symmetry groups. Criteria for the existence of critical orientations are defined; approaches to finding these orientations are presented.
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