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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。
A high-power, non-chain, pulsed deuterium fluoride (DF) laser with discharge excitation and repetition frequency operation was developed. By using a double-voltage energy storage circuit and a self-initiated discharge excitation method, a volume 1.65 L of uniform glow discharge; with a large flow centrifugal fan to provide 8.5 m / s wind speed to achieve a rapid update of working gas between the electrodes; the use of mesoporous basic molecular sieve to complete the discharge product adsorption treatment. The effects of working gas parameters and charging voltage on laser output performance were experimentally studied. At a total pressure of 8.1 kPa, a working gas ratio of 8: 1 for SF6 and D2 and a charging voltage of 43 kV, a single pulse of 3.46 J Energy, electro-optical conversion efficiency of 3.12%, pulse width of 135 ns. At 50 Hz, a laser output with an average power of 150 W was obtained with a difference in pulse amplitude of better than ± 8%. The measured far-field divergence angle was 7.92 mrad and 9.58 mrad in the horizontal direction and the vertical direction respectively, and 22 laser lines were obtained by DF laser line analyzer. The results show that discharge excitation unchained pulsed DF laser is an effective way to obtain high power mid-infrared laser.