Abstract
Heating of a slab induced by laser irradiance is studied. The temperature dependence of surface optical absorptance is taken into consideration. The heat diffusion equation is solved using the Laplace integral transform method. The temperature profile within the slab
T (
x,
t) and the variation of temperature with time at the front surface of the slab
T (
O,
t) are obtained. The temperature at the rear surface at any instant of exposure time
T (
d,
t) can be computed. Such profiles are no longer linear functions of laser irradiance. Computations for such profiles for four different targets, namely aluminium, copper, silver and gold are given as illustrative exmaples. The effect of the temperature dependence of the surface optical absorptance on such profiles must be considered although it is revealed to be less effective at higher values of laser irradiances.