Abstract
An investigation was made of the nature of the dependence of the bulk laser damage threshold of solid transparent materials on the size of the focusing-lens caustic. Experiments carried out on a large number of different samples of NaCl and KCl crystals showed that for λ = 10.6 µ and the focusing-lens caustic diameter 23 µ, the dependence on this diameter was due to the presence of microdefects. It was also established that in the case of λ = 1.06 µ radiation and small caustics (5–30 µ) the same dependence could be unrelated to microdefects. A statistical theory was developed for determining the distribution function of the defect damage thresholds from the nature of the size dependence.
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