Yb∶YAG薄片多程激光放大器的设计及实验研究

Design and Experimental Investigation of Yb∶YAG Thin-Disc Multipass Laser Amplifier

薄片多程激光放大器通过种子光多次通过片状增益介质来提取能量,可实现高平均功率、高脉冲能量、高光束质量的激光输出,是高功率短脉冲激光系统的重要组成部分。基于Yb∶YAG片状晶体,设计并搭建了可实现种子光20次放大的薄片多程激光放大器。采用该激光器对高重复频率种子光进行放大实验,认为该片状多程激光放大器可有效保证输出光的光束质量,但光谱不匹配会影响脉冲光的单程增益。

A thin-disc multipass laser amplifier enables a seed laser to frequently pass through the gain medium to extract energy. Such an amplifier can output a high average power, high pulse energy, and high beam-quality laser, which plays an important role in a high power short-pulse laser system. In this paper, a Yb∶YAG thin-disc multi-pass laser amplifier that can amplify a seed laser over the course of 20 passes is designed and constructed. An amplification of a high-repetition frequency short-pulse laser is performed, and it is found that the thin-disc multi-pass laser amplifier can effectively guarantee the beam quality of the output laser. In addition, spectral mismatch is observed to have an influence on the single gain of a short-pulse laser.