紫外预电离放电引发的非链式脉冲DF激光器

UV-preionized Electric-discharge Non-chain Pulsed DF Laser

采用紫外预电离的横向放电方式和稳定光学谐振腔,使用无毒无腐蚀性的六氟化硫(SF6)和氘气(D2)作为工作物质,研究了工作气体配比、总气压对放电引发非链式脉冲氟化氘(DF)激光器输出能量的影响。实验发现SF6与D2的最佳比例为10:1,最佳总气压为10.5 kPa。使用DF激光谱线分析仪对激光输出谱线进行了测量,得到了17条P支跃迁谱线,激光能量集中在3.876μm附近的几条谱线。利用烧蚀光斑的方法测得输出激光束水平方向、垂直方向的发散角均为1 mrad。在最佳工作条件下,充电电压为39 kV时,激光单脉冲输出能量达到最大值3.58 J,此时激光脉冲宽度为215 ns,峰值功率为16.65 MW,电光转换效率为2.08%。

Using non-toxic and non-corrosive sulfur hexafluoride （SF6） and D2 as working gas, the influence of the ratio and total pressure of the mixture gas on the performance of non-chain pulsed DF laser with a stable optical resonator is investigated. The research is based on UV-preionized transverse discharge method. The results show that the optimum ratio and total pressure of the SF6- D2 mixture gas, are 10：1 and 10.5 kPa, respectively. By using the DF laser spectrum analyzer to measure the output spectrum of DF laser, 17 P-branch transition lines are attained, which the laser energy concentrates in several lines near the 3. 876 βm line. The laser beam divergence angles in both horizontal and vertical directions are 1 mrad, which is obtained by using the laser ablation method. The maximum single pulse energy of 3.58 J, pulse duration of 215 ns, peak power of 16. 65 MW, and electro-optical conversion efficiency of 2.08% are achieved under the best working conditions when the charging voltage is 39 kV