Laser-induced incandescence of rough carbon surfaces

Abstract

Laser-induced incandescence (LII) of rough carbon surfaces was studied under the Q-switched YAG:Nd laser excitation. For the surfaces irradiated by a sequence of laser pulses, the non-monotonic behavior of LII intensity with the increase of number of irradiating laser pulses was observed. Computer simulation of pulsed laser heating of rough carbon surfaces revealed essential non-uniformity of the temperature field on the irradiated surface hence the surface relief is affected by the laser irradiation due to the processes of evaporation of the peaks on the irradiated surface. The intensity of LII was calculated as a function of height of the surface roughness. The results of calculations explain the observed features of LII of carbon surfaces.