Thallium chloride, KRS-6, and KRS-5 crystals were grown. Their bulk optical losses at wavelengths of 5?6 and 10.6? were (3?5)?10?5 cm?1 (13?22 dB/km). For KRS-6 crystals a relationship was established between the bulk absorption coefficients and the concentrations of various impurities.
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Artyushenko et al. (1980) studied this question.
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