Abstract
The optical inhomogeneities in ruby laser crystals, resulting from inhomogeneity of the chromium concentration, from various glide paths, and from the presence of disoriented blocks, are investigated. It is shown that the most harmful influence on the characteristics of laser damage is exerted by the axially asymmetrical part of the refractive index distortion due to residual mechanical stresses. A correlation is obtained between the inhomogeneity of the refractive index and the laser beam divergence. A method is proposed for improving the optical inhomogeneity of the ruby laser crystals by high-temperature (diffusion) annealing.
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Translated from Trudy Ordena Lenina Fizicheskogo Instituta im. P. N. Lebedeva, Vol. 101, pp. 130–147, 1978.
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Danileiko, Y.K., Manenkov, A.A., Prokhorov, A.M. et al. Optical inhomogeneities in ruby crystals. J Russ Laser Res 1, 248–263 (1980). https://doi.org/10.1007/BF01122675
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DOI: https://doi.org/10.1007/BF01122675