Abstract:
The technique of growing optically transparent crystals of $\mathrm{KAl(SO_4)_{2}12H_2O}$ from aqueous solution was developed. It has been established that under the action of mechanical load, the studied crystal becomes optically anisotropic. The arising deformations cause induced birefringence. In this case, the directions of the principal axes of the dielectric permeability ellipsoid of the material coincide with the directions of the principal axes of the stress ellipsoid. In the case of one-sided compression, this compression direction becomes highlighted and plays the role of an optical axis. The optical properties of a body deformed in this way correspond to the properties of an uniaxial crystal. From the experimental dependence of the birefringence of the crystal on the external mechanical stress applied to the crystal, the constant of the elastic-optical effect is determined.
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