Piezooptic Effect in LiRbSO4 Crystals
DOI:
https://doi.org/10.15407/ujpe71.9.754Keywords:
crystal, birefringence, dispersion, uniaxial stress, phase transition, piezooptic coefficientsAbstract
An optically high-quality single crystal of LiRbSO4 was synthesized, and the influence of uniaxial stress (σm ≈ 200 bar) applied along various crystallophysical directions on the spectral (300–700 nm) and temperature (77–650 K) dependences of birefringence Δni was investigated. The results demonstrate that Δni is highly sensitive to uniaxial stress, exhibiting an almost linear increase with increasing pressure. The application of stress applied along different crystallographic directions leads to variations δΔni that differ in both sign and magnitude. When a uniaxial stress of σz = 77 bar is applied, an optical pseudoisotropic point is induced in the crystal. The application of uniaxial stress does not alter the general shape of the Δni (T) dependences; however, noticeable differences were observed in the magnitudes of the discontinuous changes in Δni at phase transitions, with the applied stress reducing the value of δ(Δni). The dispersion and temperature dependences of the piezooptic coefficients π0im(λ) and π0im(T) of LiRbSO4 crystals were also examined. It was established that these coefficients exhibit weak dispersion, such that ∂π0im/∂T < 0. The variations of π0im(T) in the phase transition regions were analyzed in detail. The contributions of the electrooptic and elastoptic effects, as well as that of the order parameter, to the spontaneous changes in the piezooptic coefficients were evaluated. The analysis revealed that the largest contribution (approximately 80%) near the phase transition temperature T4 is associated with the emergence of spontaneous polarization.
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