Abstract
The effect of uniaxial stresses applied along the principal crystallographic directions on the dispersion and temperature dependences of birefringence of K2SO4 crystals is studied. The birefringence is found to be sensitive to uniaxial stresses. The spectral and temperature dependences of the combined and absolute piezo-optic coefficients of these crystals are investigated. Their significant anomalies are observed at the ferroelectric phase transition. They are caused by the change in the induced birefringence due to the occurrence of spontaneous deformation. The contributions of the electro-optic and elasto-optic effects to the spontaneous variations in the piezo-optic constants are separated.
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