Abstract
The influence of multiple laser irradiation of the prethreshold intensity (λ=10.6 μm) on the threshold of optical break-downW and the yield pointτ of NaCl crystals with different concentration of Ca++ impurity (from 30 to 500 ppm) was studied.W and τ samples were measured simultaneously, which were annealed isothermally with the following hardening.
Comparison of the effect of laser and heat treatment onW and τ allowed to conclude that the multiple irradiation of NaCl crystals with high concentration of Ca++ impurity leads to dissolving the impurity complexes absorbing the radiation, causing the increase of the crystal optical strength.
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Galustashvili, M.V., Driyaev, D.G. Evolution of impurity centres in NaCl: Ca single crystals under laser radiation. Acta Physica Hungarica 57, 309–312 (1985). https://doi.org/10.1007/BF03158902
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DOI: https://doi.org/10.1007/BF03158902