Influence of local inhomogeneity of refractive index on laser damage

Vitali E. Gruzdev; Mikhail N. Libenson

doi:10.1117/12.468962

29 May 2002 Influence of local inhomogeneity of refractive index on laser damage

Vitali E. Gruzdev, Mikhail N. Libenson

Proceedings Volume 4748, ICONO 2001: Fundamental Aspects of Laser-Matter Interaction and Physics of Nanostructures; (2002) https://doi.org/10.1117/12.468962
Event: XVII International Conference on Coherent and Nonlinear Optics (ICONO 2001), 2001, Minsk, Belarus

Abstract

Resonant effect connected with nonlinear light propagation through dielectric with small non-absorbing microinclusion is considered. It can play important role in initiating of laser-induced damage of transparent materials through local increasing of laser intensity inside and near the microinclusion. The effect is developing of field instability in nonabsorbing microinclusions resulting from excitation of resonant mode through inducing of variations of refractive index. It is shown that transparent microinclusion can initiate about 10 times local increase of laser intensity accompanied by positive feedback. If the electric field strength exceeds damage threshold during nonlinear evolution in the inclusion then developing of field instability results in damage of micro-inclusion before electric field is stabilized at certain upper level determined by ionization processes. There estimated threshold of field instability is about several MV/cm. Its dependence on material and radiation parameters is studied.

Citation Download Citation

Vitali E. Gruzdev and Mikhail N. Libenson "Influence of local inhomogeneity of refractive index on laser damage", Proc. SPIE 4748, ICONO 2001: Fundamental Aspects of Laser-Matter Interaction and Physics of Nanostructures, (29 May 2002); https://doi.org/10.1117/12.468962

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