被动式探针光系统工程化改造研究

Engineering alteration of a passive mode optical probe system

星光Ⅱ激光装置上建立的紫外探针光系统,用星光Ⅱ的子束作为抽运光源,通过倍频和受激喇曼散射,将波长为1054nm、脉宽约为800ps的激光转换成波长为308nm、脉宽约为60ps、能量为1m J左右的紫外光,作为激光等离子体诊断的光源。原有探针光系统由于受系统结构不稳定及光束质量较差等因素的影响,不能稳定运行。为了提高系统的运行质量和稳定性,对原系统进行了工程化的改造。通过实验验证,探针光系统输出能量能够达到1m J左右、脉宽约为30ps、均匀性较好、运行成功率大于90%,这一结论满足了激光等离子体诊断光源的要求。

The UV optical probe at xinggnang-Ⅱ laser installations is pumped by a sub-laser beam. A pulse of 800ps with 1054nm wavelength is converted into an output UV pulse with 1mJ energy, 60ps pulse-width and 308nm wavelength through stimulated Raman frequency conversion. The obtained UV laser pulse can be used as the lamp-house for laser plasma diagnosis. The original optical probe can＇t run steady because of poor quality and structure instability. In order to enhance the quality and stability,engineering alteration is performed on the original system. Experiment results prove that the optical probe can output an uniform pulse with 1mJ energy 30ps pulse-width, and it can operate steadily with stabilization rate over 90%, which meets the requirement of the probe lamp-house for laser plasma diagnosis.