Abstract
Laser heating of a slab with temperature-dependent surface absorptance is studied considering also cooling conditions at the front and rear surfaces.
Laplace integral transform method is used to solve the heat diffusion equation for the considered problem. Expressions for temperature profile
T(
x,
t), within the slab, the temperature of the front surface
T(0,
t) and that of the rear surface
T(
d,
t) are obtained.
Computations to find such profiles for four elements: aluminum, copper, silver and gold are made. Each target is 5 μm thick and subjected to laser power density 10
12 W/m
2. The critical time intervals
t
m
required to initiate melting for the four elements are obtained.
The obtained results revealed that considering the temperature dependence of the surface absorptance is of predominant effect on
t
m
while considering the cooling effects at boundary surfaces are of negligible influence.