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

• 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
• ISSN: 1063-7818; 1468-4799
• DOI: 10.1070/QEL17171

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.