Effects of laser radiation on matter. Laser plasma

Thresholds of surface plasma formation by the interaction of laser pulses with a metal

I. Yu. Borets-Pervak, V. S. Vorob'ev

Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow

Abstract: An analysis is made of a model of the formation of a surface laser plasma which takes account of the heating and vaporisation of thermally insulated surface microdefects. This model is used in an interpretation of experiments in which such a plasma has been formed by irradiation of a titanium target with microsecond CO₂ laser pulses. A comparison with the experimental breakdown intensities is used to calculate the average sizes of microdefects and their concentration: the results are in agreement with the published data. The dependence of the delay time of plasma formation on the total energy in a laser pulse is calculated.

PACS: 52.50.Jm, 61.80.Ba, 68.35.Dv

Received: 31.12.1995

 English version: Quantum Electronics, 1995, 25:4, 354–356

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