Ukrainian Journal of Physical Optics 

Number  4, Volume 3,  2002

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Temperature Behavior of the Coefficients of Combined Piezoelectrooptical Effect at the Proper Ferroelectrical Phase Transition in Pb5Ge3O11 
Vlokh R., Mys O., Kostyrko M.

Institute of Physical Optics, 23 Dragomanov Str., Lviv, 79005, Ukraine

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The article is devoted to the study of a combined piezoelectrooptical effect induced by a bias electric field and external mechanical stress in the Pb5Ge3O11 crystals at the proper ferroelectrical phase transition. The measurements were carried out on the application of electrical field and of mechanical stress ?33 along z axis. The electrooptical “butterfly” like hysteresis loops were obtained at different temperatures in the range of the ferroelectric phase on the application of different magnitudes of mechanical stress. On the base of dependencies ?n=f(E3,?33)  the temperature behavior of the electrooptical coefficient of Pockels effect n33r33-n13r13, Kerr effect n33R33-n13R13 and coefficients of combined piezoelectrooptical effect n33N333-n13N133 were obtained.  Phenomenological analysis of the temperature dependence of these coefficients have been made. It was shown that temperature dependence of combined bilinear piezoelectrooptical effect coefficients in the ferroelectrical phase follow the temperature dependence of dielectric permitivity. The Curie-Weiss constant has been calculated on electrooptical measurements (C=1.21*10+4K) and on piezoelectrooptical measurements (C=1.22*10+4K) and it is in good agreement with the value obtained from dielectric measurements (C=1.04*104+K).

Key words: combined piezoelectrooptical effect, ferroelectrics, electrooptical effect, Pb5Ge3O11 crystals.

PACS: 78.20.Hp,78.20.Jq

doi 10.3116/16091833/3/4/277/2002

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