介绍了一种激光二极管抽运的高重复频率、大能量、高光束质量的激光主振荡功率放大器(MOPA)系统。针对激光二极管抽运MOPA系统在放大过程中的主要技术问题,进行了系统的研究。采用计算机模拟并结合实际应用设计了激光二极管侧面均匀抽运结构,从理论上对激光放大器的性能进行了估算。放大过程中采取了补偿热致双折射效应、保持高光束质量、防止自发辐射产生及抗破坏等措施,在重复频率为100 Hz时,单脉冲输出能量为5 J,脉宽约为20 ns,光束质量约为5倍衍射极限。

The laser diode (LD) pumped MOPA system with high frequency, large energy, high beam quality is presented. The main techniques in the LD pumped MOPA system are researched systematically. Combined computer simulation and practical application, the LD uniformly side pumped laser structure is designed, and the performance of the laser is estimated theoretically. The measures to compensate the thermal induced birefringence effect, maintain high beam quality, avoid spontaneous irradiation and improve the damage threshold are taken in the amplification process. While the repetition is 100 Hz, the single pulse energy output reaches 5 J, the pulse width is about 20 ns and the beam quality is 5 times of the diffraction limit.