The Refractive Properties of Uniaxially Stressed Doped TGS Crystals

Abstract

The effect of uniaxial mechanical stresses applied along the principal crystal-physical axes on the principal values of birefringence Δ n _i is studied on TGS crystals with L-threonine, L-valine and D-serine admixtures. It is revealed that Δ n _i are quite sensitive to the stresses and have different values and opposite signs. The baric coefficients ∂T_c/∂ σ_m for the phase transition (PT) temperature appear to be smaller than those for the pure TGS crystals. Temperature and spectral dependences of the combined piezooptic constants are calculated.

Keywords:

• Birefringence
• refractive indices
• uniaxial pressure
• phase transitions
• piezooptic constants

PACS:

• 78.20. Ci
• 78.20. Hp
• 61.50. Ks