Stress-induced optical dichroism ofdefects in MgO
- 15 December 1977
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 16 (12), 5528-5534
- https://doi.org/10.1103/physrevb.16.5528
Abstract
Stress-induced optical-dichroism and optical-absorption spectra are reported for MgO centers that were produced by quenching MgO:Li from 1200°C. An analysis of the spectra by the method of moments is presented. A strong temperature-dependent dichroism is attributed to the paraelastic alignment of inherently anisotropic defects. The anisotropy of the defects can be described by a ratio of the transition-dipole strengths, , and an energy splitting, eV, for light polarized parallel () and perpendicular () to the defect symmetry axis. These results are well explained by the polaron model of the defect, and no evidence is found for an ion-model contribution to the optical band, although the numerical uncertainties preclude a definite conclusion. At liquid-helium temperature the stress-induced alignment of the defects is hindered by random crystal fields, which can be described by an effective temperature, K. These fields can be attributed to a random distribution of charged point defects, but they cannot be attributed to centers.
Keywords
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