New model for high-power electromagnetic field instability in transparent media

Vitali E. Gruzdev

doi:10.1117/12.274246

13 May 1997 New model for high-power electromagnetic field instability in transparent media

Vitali E. Gruzdev

Proceedings Volume 2966, Laser-Induced Damage in Optical Materials: 1996; (1997) https://doi.org/10.1117/12.274246
Event: Laser-Induced Damage in Optical Materials: 1996, 1996, Boulder, CO, United States

Abstract

A model of high-power field instability is developed to describe local abrupt increasing of electromagnetic field intensity in transparent dielectric. Small local enhancement of the field amplitude is initiated by low-absorbing spherical inclusion which size is less than radiation wavelength. Exceeding threshold of optical bistability results in abrupt increasing of field amplitude in the defect that also leads to local increasing of field amplitude in the host material in the vicinity of the inclusion. Bearing in mind nonlinear dependence of refractive index of the host material on light intensity we develop a model to describe 'spreading' of initial defect up to size appropriate for the first resonant field mode to be formed. Increasing of refraction index due to nonlinear light-matter interaction and existence of high-Q eigenmodes of dielectric sphere can both cause positive feedback's and result in field instability in the medium. Estimates are obtained of the threshold value of incident-field amplitude. This model is applied to analysis of some experimental data on optical breakdown of transparent dielectrics and thin films, both impurity-induced and intrinsic. The model can also be used to consider bulk optical breakdown by tightly focused light beams.

Citation Download Citation

Vitali E. Gruzdev "New model for high-power electromagnetic field instability in transparent media", Proc. SPIE 2966, Laser-Induced Damage in Optical Materials: 1996, (13 May 1997); https://doi.org/10.1117/12.274246

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