Dynamical evolution of the surface microrelief under multiple-pulse-laser irradiation: from order to chaos

A. Barborica; Ion N. Mihailescu; Mihai Ganciu; Valentin S. Teodorescu; Ioan Ursu

doi:10.1117/12.203523

8 March 1995 Dynamic evolution of the surface microrelief under multiple-pulse-laser irradiation: from order to chaos

A. Barborica, Ion N. Mihailescu, Mihai Ganciu, Valentin S. Teodorescu, Ioan Ursu

Proceedings Volume 2461, ROMOPTO '94: Fourth Conference in Optics; (1995) https://doi.org/10.1117/12.203523
Event: ROMOPTO '94: 4th Conference on Optics, 1994, Bucharest, Romania

Abstract

We introduce a new theoretical analysis of the temporal and spatial evolution of surface topography of solids following interference between incident and scattered pulsed laser beams. The essential role played by the nonlinear delayed feedback in the laser radiation-surface system is considered. We show that it finally determines the surface topography evolution from pulse to pulse. In order to complete the analysis, numerical calculations have been conducted under the hypothesis of strong attenuation of laser radiation into the sample and of a limited heat diffusion during the action of a laser pulse. We predict an evolution from very simple to complex (chaotic) structures under multipulse laser irradiation of solid surfaces. This evolution is determined by some key irradiation parameters--initial surface microrelief, incident laser intensity and the number of applied laser pulses. Experiments were performed in order to check-up the main predictions of the theoretical analysis. The system TEA-CO₂ laser radiation ((lambda) equals 10.6 micrometers )--fused silica was chosen as appropriate for performing test experiments. Optical microscopy studies of laser treated zones evidenced special modifications of the surface topography in good accordance with the conclusions following from the theoretical analysis. The theoretical analysis is also in good agreement with some available data from literature, at the same time providing a coherent interpretation of previously unexplained behaviors.

Citation Download Citation

A. Barborica, Ion N. Mihailescu, Mihai Ganciu, Valentin S. Teodorescu, and Ioan Ursu "Dynamic evolution of the surface microrelief under multiple-pulse-laser irradiation: from order to chaos", Proc. SPIE 2461, ROMOPTO '94: Fourth Conference in Optics, (8 March 1995); https://doi.org/10.1117/12.203523

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KEYWORDS

Laser scattering

Pulsed laser operation

Scattering

Light scattering

Laser irradiation

Laser damage threshold

Silica

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