Self-consistent problem of motion and surface form calculation when a film of a liquid semiconductor (semimetal) is heated by a laser beam

E. D. Eidelman

doi:10.1117/12.271686

4 April 1997 Self-consistent problem of motion and surface form calculation when a film of a liquid semiconductor (semimetal) is heated by a laser beam

E. D. Eidelman

Author Affiliations +

Proceedings Volume 3093, Nonresonant Laser-Matter Interaction (NLMI-9); (1997) https://doi.org/10.1117/12.271686
Event: Nonresonant Laser-Matter Interaction, 1996, St. Petersburg, Russian Federation

Abstract

During the first stage the layer melted by laser radiation is very thin. Under these conditions the motion is along the layer and this motion begins to change to cellular only when the heating effect reaches a threshold value. Therefore, the molten zone spreads rapidly until its size along the sample becomes approximately 40 times greater than in the direction of depth. The shape of the surface corresponds to that of shallow crater. However, the increase in the depth and surface area stimulates the stabilizing action of the thermocapillary effect. We shall calculate the layer thickness and the characteristics of convective motion under the simultaneous action of all the factors mentioned above. The problem is self-consistent since the film thickness and the characteristics of convection depend on one another. A detailed analysis of the results give us the mechanism of the formation of a zone which is melted by laser radiation.

Citation Download Citation

E. D. Eidelman "Self-consistent problem of motion and surface form calculation when a film of a liquid semiconductor (semimetal) is heated by a laser beam", Proc. SPIE 3093, Nonresonant Laser-Matter Interaction (NLMI-9), (4 April 1997); https://doi.org/10.1117/12.271686

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