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Combined Piezoelectrooptic Effect in Rochelle Salt at
the Phase Transition
Vlokh R., Mys O., Kostyrko M.
Institute of Physical Optics, 23 Dragomanov Str., 79005
L'viv, Ukraine
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The results of study of piezoelectrooptic (PEO) effect in the course
of ferroelectric-ferroelastic phase transition in Rochelle salt crystals
are presented. The coefficient of the combined effect is obtained from
measurements of the changes in the electrooptic coefficients under the
action of mechanical stress and the changes in the piezooptic coefficients
under the action of electric field (or spontaneous polarization). It is
shown experimentally that the values of both coefficients are the same,
as predicted by the theory. The temperature dependence of the coefficient
of combined PEO effect is obtained. Its anomalous behaviour at the phase
transition appears due to the dielectric permitivity anomaly. It is also
demonstrated that the change in the piezooptic coefficients at the phase
transition in Rochelle salt crystals may be satisfactorily explained as
a result of linear and quadratic PEO effect induced by spontaneous polarization.
PACS: 78.20.Hp, 42.25.Lc, 77.84.-s
Key words: combined piezoelectrooptic effect, Rochelle salt, phase
transition
doi 10.3116/16091833/5/2/70/2004 |
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