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Journal of Physical Studies 15(2), Article 2701 [5 pages] (2011)
DOI: https://doi.org/10.30970/jps.15.2701 PHOTOELASTICITY OF OPTICAL RETARDATION AND BIREFRINGENCE OF THE CaWO4 CRYSTALSB. H. Mytsyk, Ya. P. Kost', A. S. Andrushchak, I. M. Solskii
Karpenko Physico-Mechanical Institute |
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All piezooptic coefficients (POC) of optical retardation and birefringence for calcium tungstate tetragonal crystals were determined. Relations for these coefficients have as main absolute POCs and turning, shift, turning-shift POCs. The temperature stability of the largest POCs was studied and a high temperature stability of the birefringence of CaWO$_4$ crystals was shown. The largest POCs of calcium tungstate are twice as large as the relevant POCs of the LiNbO$_3$ model acousto-optic crystal. Taking into consideration that fact and the short-wave limit of transparency region of 130 nm we have concluded that calcium tungstate is a promising material for the light acousto-optic modulation in the visible and ultraviolet spectral regions.
PACS number(s): 78.20.Hp