Abstract
We show how a singularity of optical fiel d can be used for determination of piezooptic coefficient of crystal s under their torsion, in particular in the situation when the natural optical activity makes direct polar imetric experiments too complicated. Experimental studies of an op tical vortex appearing under torsion of lead germanate crystals have enabled us to determine so-called non-principal coefficients (π14 and π25). A relationship between the spin angular momentum of light beam and the piezooptic coefficients has been derived.
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