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Baric Changes in the Optical Indicatrix of TGS Crystals with L-threonine Admixture

Author(s): V.Kardash | G.Romanyuk | R.Brezvin | V.Kurlyak | V.Stadnyk

Journal: Ukrainian Journal of Physical Optics
ISSN 1609-1833

Volume: 4;
Issue: 4;
Start page: 173;
Date: 2003;
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Keywords: birefringence | uniaxial pressure | phase transitions | piezooptic coefficients

The influence of uniaxial mechanical stresses, applied along the principal crystal-physical axes, on the principal values of birefringence ?ni is studied for TGS crystals with 5% L-threonine admixture. It is revealed that ?ni are quite sensitive to the mechanical stresses. The baric coefficients dTc/dsm for the phase transition temperature appear to be less than those for the pure TGS. Temperature dependences and dispersion of the piezooptic coefficients are calculated. The jump-like changes in all of the piezooptic coefficients occurring at the Curie temperature in the doped crystals are explained with the contrib-utions of a secondary electrooptic effect.

Tango Jona
Tangokurs Rapperswil-Jona

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