MODELING THE INTERACTION BETWEEN LASER AND TARGET MATERIAL IN LASER MICROSPECTRAL ANALYSIS

The interaction between laser radiation and target material plays an i mportant role in understanding and controlling any material processing technique involving lasers. In this paper, a two-dimensional time-dep endent model, based on heat transfer and energy conservation theory, h as been developed to simulate the transient material behaviour in lase r microspectral analysis (LMA). The spatial and temporal profile of th e laser beam and the temperature dependent properties of the material, such as absorptivity, heat capacity and thermal conductivity, are con sidered. Finally, the experimental and computational results are compa red and the interaction between the laser radiation and workpiece are discussed.