Nd:YAG薄片激光器热致波前畸变

Simulation of thermal effect on beam distortion in Nd:YAG thin disk laser

理论分析了激光二极管端面泵浦薄片Nd:YAG激光器的激光介质热效应对波前相位分布的影响,给出了薄片激光器波前热畸变的计算公式。数值模拟了理想均匀泵浦及4阶超高斯泵浦下的波前分布,分析了介质厚度和泵浦均匀性与波前畸变量的关系。研究表明,介质越薄,激光泵浦光均匀性越好,泵浦功率密度越小,激光波前畸变越小;与介质厚度、泵浦功率密度相比,泵浦光光强分布对波前的影响更为显著。

The thermal effect of the medium in the end-pumped Nd：YAG thin-disk laser on the wavefront distribution was studied, and the calculation expression of the beam distribution in the thin-disk laser was provided. The wavefront distributions of the thin disk pumped by the ideal beam and 4th order super-Gaussian beam were simulated. The relationships between the beam distortion and the laser medium thickness and uniformity of the pumped beam were analyzed. The results show that the thiner the thin-disk is, the more uniform the pumped beam is and the smaller the pump power density is, the smaller the beam distortion is. Compared with the thin-disk thickness and the pump power density, the influence of the intensity distribution of the pumped beam on the wavefront distributioin was greater.