Ukrainian Journal of Physical Optics 

Number  3, Volume 7,  2006

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Piezooptic Coefficients and Acoustic Wave Velocities in Sn2P2S6Crystals
1Mys O., 1Martynyuk-Lototska I., 2Grabar A., 2Vysochanskii Yu., 1Vlokh R.

1Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine, 
2Institute for Solid State Physics and Chemistry of Uzhgorod National University, 54 Voloshyn St., 88000 Uzhgorod, Ukraine, e-mail:agrabar@univ.uzhgorod

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Piezooptic coefficients of Sn2P2S6 crystals are experimentally determined for l=623.8 nm and T= 293 K with the aid of interferometric technique. The components of the elastic stiffness tensor for these crystals are calculated on the basis of studies for the acoustic wave velocities. It is shown that acoustooptic figure of merit can achieve extremely high values for Sn2P2S6 crystals (M2 – 2*10-12s3/kg2).

Key words: Sn2P2S6 crystals, piezooptic coefficients, ultrasonic velocities, semiconductors, ferroelectrics

PACS: 78.20.Hp, 42.70.-a, 62.65, 62.20.Dc

doi 10.3116/16091833/7/3/124/2006
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