Exact account for the absorption non-linearity in problems of surface laser treatment

A.D.Suprun, L.V.Shmeleva

T.Shevchenko Kyiv National University, Physical Department, 6 Glushkov Ave., 01022 Kyiv, Ukraine

Received April 10, 1999

Effect of a high-power laser pulse on the surface laser treatment conditions of a material has been considered under account for non-linearity of the pulse absorption in the material volume. An exact analytical solution of the appropriate heat conductivity problem has been obtained as the space-time temperature behaviour. Basing on that solution, the surface temperature dynamics determining the above-mentioned threshold conditions has been considered. An account for the volume absorption non-linearity on the basis of two-level model has been shown to result always in an increase of the material destruction threshold.

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