Numerical Treatment Of Laser Interaction With Solid In One Dimension

Abstract

The laser radiation has great important in many applications. In this paper we have studiedthe influence of laser radiation on solid material. We use a (800 μs) pulsed laser ND: YAGwith (1.06 μ m) wave length, (3 J) energy and power density of (7.6 X 106 W/cm2) . We havededuced a mathematical function for laser energy with time, then deducing a function for laserpower density with time because practically assumed to be constant.A lead material used in this paper for study, we have deduced mathematical functions forthermal properties (conductivity, specific heat, density, diffusivity) with temperature, andsolve the partial differential equation (P.D.E) which represent the heat transfer of laserradiation to the material in one dimension, presumes variable and constant laser density ( I=I0and I=I(t)) , also the thermal properties conductivity , specific heat ,density and diffusivity (K=K0 and K=K(T),C=C0 and C=C(T), ( ) 0    and   T ,du=du0 and du=du(T))respectively .The results reveal that the time of evaporation increase when the laser density is taken asvariable with time , also it increase when the thermal properties were vary with temperature .We used (Matlab 7.0) to perform all programs which related with this paper