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- Title
Optical anisotropy induced by torsion stresses in the crystals belonging to point symmetry groups 3 and 3.
- Authors
Skab, I.
- Abstract
We describe a torsion method for measuring piezooptic coefficients π14 and π25 in the trigonal crystals belonging to the point symmetry groups 3 and 3 . The XY-distributions of the optical indicatrix orientation and the optical birefringence induced by the torsion stresses are analysed and evaluated quantitatively. It is shown that the spatial birefringence distribution in the sample subjected to torsion around the Z axis represents a canonical cone. The combined piezooptic coefficient for lead germanate crystals is determined experimentally. It is shown that, for all of the point symmetry groups of trigonal system, the torsion torque applied around the directions of optic axes would lead to appearance of a purely screw dislocation of the phase front of the outgoing wave, while the corresponding optical vortex would possess a unit topological charge.
- Subjects
TORSION; DOUBLE refraction; ANISOTROPY; MATHEMATICAL crystallography; MATHEMATICAL models; MATHEMATICAL models of optics
- Publication
Ukrainian Journal of Physical Optics, 2012, Vol 13, Issue 3, p158
- ISSN
1609-1833
- Publication type
Article
- DOI
10.3116/16091833/13/3/158/2012