Surface periodic structures under the optical damage of transparent dielectrics

Mikhail N. Libenson; Vladimir S. Makin; V. A. Shiryaev; M. J. Soileau

doi:10.1117/12.213774

14 July 1995 Surface periodic structures under the optical damage of transparent dielectrics

Mikhail N. Libenson, Vladimir S. Makin, V. A. Shiryaev, M. J. Soileau

Proceedings Volume 2428, Laser-Induced Damage in Optical Materials: 1994; (1995) https://doi.org/10.1117/12.213774
Event: Laser-Induced Damage in Optical Materials: 1994, 1994, Boulder, CO, United States

Abstract

Experimental studies of the laser element's radiation strength show that optical damage of transparent dielectrics may be accompanied by the formation of surface periodic structures (SPS). SPS with ripples oriented normally to the strength vector of the incident electric field were found on the output surface of a dielectric plate (alkali- halide crystal) under focusing near or middle IR laser radiations of a microsecond duration. This relief was assumed to arise from heating caused by interference between the incident light and the wave scattered from the surface defects on the assumption that scattered wave represents a rapidly decreasing field of the Coulomb type. More correct SPS model developed by V. S. Makin proposes participation of surface electromagnetic waves (SEW). As known, optical damage is accompanied by the development of plasma flash. When emission of electronics from solid surface is strong, the plasma dielectric constant runs out to be negative with its modulus exceeding the dielectric constant of the transparent medium. This causes the generation conditions for SEW to be fulfield on the dielectric-plasma boundary, which results in interference between the incident light and SEW, thus leading to formation of SPS. The model explains reasonably well, why these SPS can be observed only on the output surface when developing plasma produces no screening effect on the surface. For CO₂ laser irradiation, the necessary electronic concentration is high but reasonable value and amounts about 10¹⁹ cm^-. However, SPS formed by the short-wavelengths radiation cannot find correct explanation in the framework of this model, since electronic concentration at the wavelengths (lambda) equals micrometers should be no less than 10²¹ cm^-3 in this case.

Citation Download Citation

Mikhail N. Libenson, Vladimir S. Makin, V. A. Shiryaev, and M. J. Soileau "Surface periodic structures under the optical damage of transparent dielectrics", Proc. SPIE 2428, Laser-Induced Damage in Optical Materials: 1994, (14 July 1995); https://doi.org/10.1117/12.213774

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