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Yb:YAG晶体比Nd:YAG晶体更适用于产生和放大具有Hz量级重复频率的高脉冲能量激光。报道了LD泵浦低温工作的Yb:YAG脉冲固体激光放大系统。整个系统由再生种子源、预放大器和主放大器3部分组成。晶体用铟和金箔作为导热层压到金属热沉上,散热方式采用传导冷却,低温环境由液氮冷却热沉来保证。实验结果表明:当晶体温度控制在150 K时,装置得到了3 J@10 ns,10 Hz的1 030 nm脉冲激光能量输出。研究了低温真空环境下介质膜的损伤等因素对泵浦参数的要求,最后分析了进一步提升脉冲能量所需要解决的问题。
Yb: YAG crystals are more suitable than Nd: YAG crystals for generating and amplifying high-pulse energy lasers with a repetition rate in the order of magnitude. The Yb: YAG pulsed solid state laser amplification system with LD pump working at low temperature is reported. The whole system consists of regenerative seed source, preamplifier and main amplifier 3 parts. Crystals with indium and gold foil as the heat conduction laminated to the metal heat sink, cooling conduction cooling, low temperature environment by liquid nitrogen cooling heat sink to ensure. The experimental results show that when the crystal temperature is controlled at 150 K, the device achieves a laser output of 1 030 nm at 3 J @ 10 ns and 10 Hz. The requirements for the pump parameters such as the damage of the dielectric film under low temperature and vacuum conditions were studied. Finally, the problems to be solved to further improve the pulse energy were analyzed.