Theoretical Investigations In The Fundamental Mechanisms Of High Intensity Laser Light Reflectivity

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Abstract
In laser processing a major physical phenomenon is the coupling of the laser energy into the workpiece. As high power infrared laser beams are directed to metallic targets, the reflectivity of the target shows a decrease. This paper describe some theoretically investigations in the laser light coupling to metallic targets. The validity of some of the reflectivity theories in relation to high power laser irradiation will be discussed based upon numerical calculations of the theoretical coefficients of reflectivity. Some possible mechanisms responsible for the changes in the optical properties of metal surfaces irradiated by high intensity laser beams, such as multi-photon absorption and effects of inhomogenous target heating will be discussed. One simple model describing the reflectivity as a function of material properties, commonly used in the litterature, is based upon the Hagens-Rubens equations. However, in this paper will be shown, why this model is not valid in the wavelength spectrum of high power lasers.

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