We present the results of theoretical studies of the laser-induced damage in transparent solids containing absorbing inclusions. The investigation is based on the inclusion-initiated thermal explosion model. Key aspects of the model are considered: thermal instability initiated by the inclusions; a mechanism of photoionization of a surrounding layer of a host material by a thermal ultraviolet-radiation of laser-heated inclusions; the thermal instability kinetics, and an associated pulse-width dependence of the laser-induced damage threshold. Also, statistical features of the damage, caused by random spatial distribution of the inclusions in the materials, and a final stage of the damage process-a mechanical stress-produced crack formation-are analyzed. A comparison of the theoretical results, related to the pulse-width dependence of the damage threshold, with experimental data for some typical optical materials in a wide pulse-width range is presented.
The natural laws of the nonlinear absorption in the nanoporous glass polymer composite doped with phthalocyanine and
porphyrin dyes is investigated experimentally using 24 nanosecond (FWHM) 532 nm laser pulses. The nonlinear
absorption in the network of the four-level model is analyzed theoretically. It is demonstrated that theoretical result and
experimental data have a good agreement.
The nonlinear refraction and nonlinear absorption of 40 nanosecond (FWHM) 532 nm pulses through the samples made
of nanoporous glass polymer composite doped with phthalocyanine and porphyrin dyes is investigated. The laser damage
resistance of 28 nanosecond (FWHM) 532 nm pulses in nanoporous glass polymer composite is measured. It is
demonstrated that the nanoporous glass polymer composite is a good solid-state host material for nonlinear element of
laser optics.
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