12 April 2001 Electromagnetic aspects of localized action of high-power laser field on transparent solids
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There are considered two effects of nonlinear light propagation that can play important role in laser-induced damage of transparent materials: self-induced variations of light polarization of focused laser beam and developing of field instability in non-absorbing microinclusions. The effect of self-induced variations of light polarization is considered qualitatively for focused laser beam with arbitrary focal spot. Detailed study of the effect is fulfilled for Gaussian beams of low order. It is shown that initial light polarization can turn into elliptic one with inhomogeneous distribution of polarization-ellips parameters. Developing of field instability in transparent microinclusions is the other considered nonlinear effect. It is shown that transparent microinclusion can initiate large local field increase accompanied by positive feedback resulting in further field increasing near the inclusion. If the electric field strength exceeds damage threshold during nonlinear evolution in the inclusion then developing of field instability results in damage of microinclusion before electric field reaches certain upper level determined by ionization processes.
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Vitali E. Gruzdev, Vitali E. Gruzdev, Mikhail N. Libenson, Mikhail N. Libenson, } "Electromagnetic aspects of localized action of high-power laser field on transparent solids", Proc. SPIE 4347, Laser-Induced Damage in Optical Materials: 2000, (12 April 2001); doi: 10.1117/12.425009; https://doi.org/10.1117/12.425009

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