高性能10J级四程预放大技术研究  

High Performance 10J Level Four-Pass Pre-Amplifier Research

作　　者：彭宇杰 王江峰[1] 卢兴华[1] 范薇[1] 李学春[1] 

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800 [2]中国科学院大学,北京100049

出　　处：《中国激光》2014年第9期12-20,共9页Chinese Journal of Lasers

摘　　要：提出了一种新型的高功率激光装置的预放系统结构,采用钕玻璃再生放大结合离轴四程放大的技术途径,研究了四程放大中寄生振荡和笔形光束的产生机理和抑制措施。通过注入脉宽为3ns,单脉冲能量小于1nJ的1053nm单纵模种子激光,可以获得10.3J的近衍射极限输出,总增益大于1010,能量稳定性为2%,输出激光为近平顶分布,近场填充因子为71%,近场调制度约为1.4,91%的焦斑能量能聚焦于2倍衍射极限内。实验结果和输出性能完全满足激光装置预放系统的性能要求,验证了多程放大技术在高功率激光装置预放系统中应用的可行性。A new laser amplifier structure based on Nd：glass regenerative amplifier and off-axis four-pass amplifier is designed for high power laser facilities.The parasitic oscillation and pencil beam of the four pass amplifier are studied and a method is introduced to suppress them.By injecting a1053 nm single longitudinal mode laser pulse with pulse duration of 3 ns and pulse energy of 1 nJ,a10.3 J amplified pulse with a 2%shot-to-shot energy stability is obtained.The total gain of the amplifier system is over 1010.The output laser beam is a flat top profile with a 71%near field fill factor and modulation of 1.4 and 91% pulse energy can be focused into 2 times of diffraction limits.The experimental results and output performance of the amplifier system fully meet the requirements of the pre-amplifier of high power laser facilities,which shows that multi-pass amplifier can be used in high power laser facilities.

关 键 词：激光器 高功率激光 预放大器 再生放大 四程放大 寄生振荡 

分 类 号：TN24[电子电信—物理电子学]