【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。更多还原

【Abstract】 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 k V, 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.更多还原