高功率放电引发非链式脉冲DF激光器  

High Power Electric-Discharge Non-Chain Pulsed DF Laser

作　　者：潘其坤[1] 谢冀江[1] 邵春雷[1] 邵明振[1] 王春锐[1] 张来明[1] 郭劲[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所激光与物质相互作用国家重点实验室,吉林长春130033

出　　处：《中国激光》2015年第7期1-6,共6页Chinese Journal of Lasers

基　　金：科技部国际合作专项基金(2011DFR10320);激光与物质相互作用国家重点实验室基金(SKLLIM 1310-01)

摘　　要：研制了一台放电激励重复频率运转的高功率非链式脉冲氟化氘(DF)激光器,采用倍压式储能电路及自引发体放电激励方式,在SF6和D2的混合气体中实现了体积为1.65 L的均匀辉光放电;凭借大流量离心风机提供的8.5 m/s风速实现了电极间工作气体的快速更新;运用介孔碱性分子筛完成对放电产物的吸附处理。实验研究了工作气体参数及充电电压对激光器输出性能的影响,在总气压8.1 k Pa,SF6与D2工作气体配比为8∶1,充电电压为43 k V时,获得了3.46 J的单脉冲能量,电光转换效率为3.12%,脉冲宽度为135 ns。在50 Hz时,获得了平均功率为150 W的激光输出,其脉冲幅值差优于±8%。实测远场发散角在水平方向和垂直方向分别为7.92 mrad和9.58 mrad,并采用DF激光谱线分析仪测试获得了22条激光谱线。结果显示,放电激励非链式脉冲DF激光器是获得高功率中红外激光的有效途径。The studies of a repetitively pulsed deuterium fluoride（DF） laser based on electric-discharge and closed cycle are presented. Using double-pressure tank circuit and a rough cathode, the self-sustained volume discharge of 1.65 L is obtained in SF6-D2 mixtures. A centrifugal fan provides adequate gas flow to refresh mixture gas quickly.The gases pass through a scrubber cell in which ground state DF molecules are eliminated from the gas stream. The influences of gas parameters and charging voltages on the output characteristics of non-chain pulsed DF laser are investigated experimentally. At the charging voltage of 43 kV, under the optimum working condition（the working gas ratio is 8：1, the total pressure is 8.1 k Pa）, a maximum output energy of 3.46 J, an electro-optical conversion efficiency of 3.12% and a pulsed width of 135 ns are got. At an operating repetition rate of 50 Hz, a maximum average output power of 150 W is obtained, whose amplitude difference of laser pulses is less than 8%. The far- field divergence angles in horizontal and vertical directions are 7.92 mrad and 9.58 mrad, respectively. 22 P-branch transition lines are achieved using DF laser spectrum analyzer. The result show that the pulsed electric- discharge DF laser is an effective technology to obtain high power mid-infrared laser.

关 键 词：激光器 高功率 工作参数优化 输出特性 

分 类 号：TN248.2[电子电信—物理电子学]