Guo Jiangtao, Wang Jiangfeng, Lu Xinghua, Huang Wenfa, Huang Dajie, Wang Xiaochao, Wei Hui, Fan Wei, Li Xuechun
Opt Express. 2023 Dec 18;31(26):43550-43559. doi: 10.1364/OE.504230.
We demonstrate a laser-diode-pumped multipass Nd:glass laser amplifier with a range of advanced characteristics. The amplifier exhibits high extraction efficiency, enables arbitrary shaping of spatial beam intensity, and effectively suppresses frequency modulation to amplitude modulation conversion. Our approach achieves excellent beam quality via thermal lensing and thermal depolarization compensation. When a 1.82 mJ/5 ns laser pulse was injected into the amplifier, the output energy reached up to 3.3 J with a repetition rate of 1 Hz at a central wavelength of 1053.3 nm. The near-field modulation of the amplified output beam was below 1.2, and the far-field focusing ability of the beam was 90% at 2.9 times the diffraction limit. This laser amplifier system holds potential for integration as a preamplifier within the SG-II upgrade high power laser facility.
我们展示了一种具有一系列先进特性的激光二极管泵浦多程钕玻璃激光放大器。该放大器具有高提取效率，能够对空间光束强度进行任意整形，并有效抑制频率调制到幅度调制的转换。我们的方法通过热透镜和热去偏振补偿实现了优异的光束质量。当一个1.82 mJ/5 ns的激光脉冲注入放大器时，在中心波长1053.3 nm处，输出能量在重复频率为1 Hz时达到3.3 J。放大输出光束的近场调制低于1.2，光束的远场聚焦能力在2.9倍衍射极限时为90%。这种激光放大器系统有潜力作为前置放大器集成到神光-II升级高功率激光装置中。
