The proposed technique is targeted at high accuracy measurement of absorbing ability of optical materials with use of laser interferometer calorimetry. The mathematical model of estimating of thermal fields, which arise in a sample at partial absorption of powerful laser radiation allows us to divide influence of coefficients of superficial and volumetric absorption Using the high capacity CO-laser for material heating makes it possible to reach measurement sensitivity of (1W3 ÷ 10') cm' of measuring of absorption coefficients of optically transparent materials. The separation of superficial and volumetric absorption allows to test quality of processing of optical elements, and thus, to predict beam durability of materials, avoiding to their physical destruction.
Resu1t of development of high-sensitive method of absorption coefficient measurement of lasers resonator mirrors that bases on use of interferometric calorimetry are presented in given work. Essence of method consists in the measurement of deformation of mirror surface in the result of its local heating at incidence ofpowerful laser beam. Investigated mirror is part of high q-factor Fabry-Perot interferometer and, in the same time, is intrinsic resonator of powerful laser, for increasing of method sensitivity.
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