Research of optical and mechanical properties of lithium aluminosilicate glass-ceramics

An optical method of registration of optical and mechanical coefficients in glassceramic materials is offered. The method is based on the modulation of polarization of laser radiation transmitted through anisotropic area and the definition of its anisotropy parameters by means of this modulation. Residual stresses in aluminosilicate glass-ceramics caused by the temperature gradient were studied by the offered method. The functional relationship of the coordinate dependence of the residual stress and stress optical coefficient in Poisson equation was established. It is shown that in the absence of temperature gradient the birefringence value and dichroism are related by the Kramers-Kronig relations. These parameters are connected with a residual mechanical stress, which has a spatial distribution.