Effect of elastic anisotropy on thermally induced distortions of a laser beam in single cubic syngony crystals with radial cooling. Part I

We have studied thermally induced distortions of a beam in single cubic syngony crystals of all symmetry groups with an anisotropic elastic stiffness tensor. The arithmetic mean and the difference between the thermally induced phase incursions of eigenpolarisations, as well as the angle of incidence...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2020-02, Vol.50 (2), p.114-135
Main Authors: Vyatkin, A.G., Khazanov, E.A.
Format: Article
Language:English
Subjects:
ANISOTROPY
anisotropy of cubic crystals
ATOMIC AND MOLECULAR PHYSICS
BEAMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COOLING
Crystal structure
CRYSTALS
Elastic anisotropy
FLEXIBILITY
high average power lasers
INCIDENCE ANGLE
Laser beams
Laser cooling
LASERS
MATERIALS SCIENCE
Optical pumping
ORIENTATION
photoelastic effect
POLARIZATION
Stiffness
Symmetry
SYMMETRY GROUPS
TENSORS
thermally induced depolarisation
thermo-optical constants
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Summary:We have studied thermally induced distortions of a beam in single cubic syngony crystals of all symmetry groups with an anisotropic elastic stiffness tensor. The arithmetic mean and the difference between the thermally induced phase incursions of eigenpolarisations, as well as the angle of incidence of these polarisations, are calculated for a long rod and a thin disk with radial cooling under uniform volume pumping of the active element. The position of the specific crystal orientations unrelated to its symmetry elements is investigated. The effective values of the thermo-optical constant Q in two specific orientations, as well as the thermo-optical constant P in an arbitrary orientation, are found.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL17171