Thermal Effect of Metal and Semiconductor Under Laser Irradiation

摘要

Different thermal effects in metal and semiconductor such as Germanium and PbS are observed under laser beam irradiation experiment. The absorptivity and thermal coupling efficiency of materials are dependent on laser parameters such as its wavelength and power. According to the theoretical analysis and experimental results, it is shown that thermal coupling efficiency increases with laser power. If it is irradiated by high repitively pulsed laser beam, the efficiency is higher than that by CW laser under the same input energy. The thermal effect is accordant with laser energy if the laser power is same. If a germanium plate is put in front of PbS material as a light filter, it will be found that the filter is heated, and PbS has obviously different heat effect because the transmittiviry of laser in germanium is decided by its wavelength. At the same time , it is complicated to calculate thermal effect in these materials under laser irradiation, because the temperature increment in germanium affects obviously on the thermal conductivity and radiation.