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 nonmonotonic 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.

Kinetics of Laser-Induced Thermal Emission of Porous Carbon Materials: Dependence on Laser Wavelength

“…In various applications of lasers, thermal radiation that occurs during a local heating of irradiated objects attracts the attention of researchers as a source of information about the properties of the irradiated material and about the processes of its interaction with laser radiation [1][2][3][4][5][6][7][8][9][10]. In the case of the laser heating of microparticles or surface layers of lightabsorbing materials, an important tool is the study of the kinetics of growth and decay of thermal emission under the pulsed laser excitation [11][12][13][14][15][16][17]. Usually, for the excitation of laser-induced thermal emission (LITE) of surface layers of light-absorbing materials, laser pulses of a nanosecond duration are used, which C i t a t i o n: Zelensky S.E., Kolesnik O.S., Yashchuk V.P.…”

The Role of Air in Laser-Induced Thermal Emission of Surface Layers of Porous Carbon Materials

“…In some cases, when recording LITE at a fixed wavelength (through a monochromator), the dependence of the thermal emission intensity on the intensity of pulsed laser excitation can be approximated by a power function with the index of the order of 10. In addition, it is worth noting that the characteristics of LITE may depend on external factors (atmospheric pressure, temperature, humidity) [12], on the surface roughness [13][14][15], and also on the previous history of the laser irradiation of samples [16,17].…”

“…LITE was observed on various carbon materials [10][11][12][13][14][15][16][17], as well as on some semiconductors (Si, Ge, GaSb, InSb) [18,19].…”