Abstract
The results of study of piezoelectrooptic (PEO) effect in the course of ferroelectric (Pb5Ge3O11) and ferroelectric-ferroelastic (Rochelle salt crystals) phase transitions are presented. It is shown that the temperature dependence of the combined PEO coefficients corresponds to the Curie-Weiss law. Basing on the studies for the combined PEO effects in LiNbO3 and LiTaO3 crystals, it is shown that the effect is interchangeable, i.e. its coefficients determined independently from the electrooptic and piezooptic experiments are the same. Large PEO effect is observed in LiNbO3 crystals, where electrooptic coefficient r22 increases almost two times after the action of mechanical stress σ 2 = 3.7× 10 5N/m2.
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