Abstract
The mechanically induced gyrotropy is studied in crystal plates of hexagonal CdS near the frequency of isotropic point (in which the refractive indices of the ordinary and extraordinary waves are equal). The transmittance of light by torsion deformed crystal (when the torsional moment is orientated along the opticalc-axis) between two crossed polarizers is measured as well as the polarization parameters of elliptically polarized emergent light. In the discussion the hypothesis that the mechanical deformation induces gyrotropy is argued. The experimental results are interpretated in the frameworks of the theory of the elliptical birefringence.
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