Computer simulation of nonlinear dynamics of high-power laser field in low-Q cylindrical defect embedded into transparent dielectric

Vitali E. Gruzdev; Anastasia S. Gruzdeva; Mikhail N. Libenson

doi:10.1117/12.321520

14 September 1998 Computer simulation of nonlinear dynamics of high-power laser field in low-Q cylindrical defect embedded into transparent dielectric

Vitali E. Gruzdev, Anastasia S. Gruzdeva, Mikhail N. Libenson

Author Affiliations +

Proceedings Volume 3343, High-Power Laser Ablation; (1998) https://doi.org/10.1117/12.321520
Event: High-Power Laser Ablation, 1998, Santa Fe, NM, United States

Abstract

The aim of our paper is to investigate possibility of local increasing of amplitude of high-power laser radiation in transparent microinclusions in dielectric media. There is presented theoretical approach to the problem allowing to show possibility of formation of unstable field structure in microsphere and microcylinder with near-resonant parameters. The instability is shown to develop as a result of laser- induced formation of sphere's or cylinder's eigenmode accompanied by positive feedback through laser-induced variation of refractive index. The instability is shown to have threshold depending on radiation and inclusion parameters. Computer modeling is used to get more detailed information about the described processes in dielectric cylinder. The presented results of modeling show dynamics of nonlinear evolution of high-power laser field in isotropic microcylinder. Several parametric dependences of instability threshold are measured using results of modeling. The presented results are discussed from the viewpoint of laser ablation and laser-induced damage of low-absorbing optical materials.

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Vitali E. Gruzdev, Anastasia S. Gruzdeva, and Mikhail N. Libenson "Computer simulation of nonlinear dynamics of high-power laser field in low-Q cylindrical defect embedded into transparent dielectric", Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); https://doi.org/10.1117/12.321520

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KEYWORDS

Dielectrics

Refractive index

High power lasers

Laser ablation

Optical spheres

Computer simulations

Laser induced damage

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