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A calculation model for the evaporation recoil pressure in laser material processing

A physical model is proposed to calculate the recoil pressure acting on the surface of an evaporating material irradiated by a high-intensity laser beam, such as encountered in laser material processing. Laser attenuation in the laser-induced plasma plume, reflection at the material surface and the energy consumption for material heating and melting are considered in this model. This evaporation model represents a revised form of that previously employed by Chen Xi (1996, 1997, 1998) to calculate the evaporation-added pressure acting on an evaporating particle exposed to a thermal plasma, but here the special features associated with laser material processing are considered. The calculated recoil pressures compare favourably with available experimental data.