Abstract
This letter presents a theoretical and experimental investigation of thermally induced polarization distortions occurring in an optical element made of c-cut tetragonal crystals. Two material characteristics were defined for this class of crystals: the optical anisotropy parameter ξ and the thermo-optical constant Q. These were generalized with analogous characteristics of elastically isotropic cubic crystals. The experimental investigation of these characteristics for popular tetragonal deuterated potassium dihydrogen phosphate (DKDP) crystal was carried out.
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