重复频率HF激光脉冲能量稳定性的理论分析
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摘要
研究了重复频率HF脉冲激光器的气体介质对激光输出能量稳定性的影响规律。计算结果表明,激光器放电区内SF_6的解离率约为1.5%(略高于实验测量值),工作气体介质的消耗速率为2.2×10~(15)(cm~(-3)·s~(-1)),但消耗量比气体的初始量小3～4个量级。通过合理控制激光器内HF的分子浓度,并适时补充激光器气体介质,可以提高激光器输出能量的稳定性。激光器输出能量变化分为过渡阶段和维持阶段,其中过渡阶段决定了重复频率工作模式下HF激光器的总体出光能力。计算结果可为重复频率非链式HF脉冲激光器设计提供技术支持。
The effect of working gas on the output energy stability of a repetitively pulsed HF laser is investigated. The calculated results show that the decomposition of SF_6 in the discharge region of the laser is about 1.5%, a little larger than the experimental data. The gas consumption rate is about 2.2×10~(15)(cm~(-3)·s~(-1)), and the consumption is 3～4 orders of magnitude smaller than the initial content. The stability of the laser output energy can be improved by properly controlling the HF molecular concentration in the laser chamber and replenishing the working gas at a right time. The change of the laser output energy can be divided into two stages, a transitional stage and a maintenance stage. The transitional stage plays a decisive role in the determination of the output power level of a repetitively pulsed HF laser. The calculated results can provide a technical support for the design of a repetitively pulsed non-chain HF laser.
The effect of working gas on the output energy stability of a repetitively pulsed HF laser is investigated. The calculated results show that the decomposition of SF_6 in the discharge region of the laser is about 1.5%, a little larger than the experimental data. The gas consumption rate is about 2.2×10~(15)(cm~(-3)·s~(-1)), and the consumption is 3～4 orders of magnitude smaller than the initial content. The stability of the laser output energy can be improved by properly controlling the HF molecular concentration in the laser chamber and replenishing the working gas at a right time. The change of the laser output energy can be divided into two stages, a transitional stage and a maintenance stage. The transitional stage plays a decisive role in the determination of the output power level of a repetitively pulsed HF laser. The calculated results can provide a technical support for the design of a repetitively pulsed non-chain HF laser.
引文
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[2] Panchenko A N,Tarasenko V F.On the efficiency of nonchain electric-discharge HF(DF) lasers[J].Russian Physics Journal,2004,47(5):571-573.
[3] Apollonov V,Kazantsev S,Saifulin V,et al.Discharge characteristics in a nonchain HF(DF) laser[J].Quantum Electronics,2000,30(6):483-485.
[4] Fradin D,Chenausky P,Freiberg R.A recirculating,self-contained DF/HF pulsed laser[J].IEEE Journal of Quantum Electronics,1975,11(8):631-633.
[5] Brunet H,Mabru M,Voignier F.High-energy high-average power pulsed HF/DF chemical laser[J].Proceedings of SPIE,1995,2502:388-392.
[6] Harris M R,Morris A V,Gorton E K.Closed-cycle 1-kHz-pulse-repetition-frequency HF(DF) laser[J].Proceedings of SPIE,1998,3268:247-252.
[7] Butyzykin I L,Velikanov S D,Evdokimov P A,et al.Experimental study of pulse-periodic DF laser operation with up to 1200-Hz repetition rate and about 25-W average power[J].Proceedings of SPIE,2001,4184:162-165.
[8] Ke C J,Wan C Y,Wu J.Compact non-chain pulsed HF laser[J].Acta Photonica Sinica,2003,32(5):513-516.柯常军,万重怡,吴谨.紧凑的非链式脉冲HF激光器[J].光子学报,2003,32(5):513-516.
[9] Ke C J,Tan R Q,Wu J,et al.A new discharge type for non-chain pulsed HF/DF laser[J].Laser Technology,2008,32(2):119-121.柯常军,谭荣清,吴谨,等.非链式脉冲HF/DF激光的新型引发技术[J].激光技术,2008,32(2):119-121.
[10] Ke C J,Zhang K H,Sun K,et al.A periodically pulsed HF/DF gas discharge laser[J].Infrared and Laser Engineering,2007,36(z1):304-306.柯常军,张阔海,孙科,等.重复频率放电引发的脉冲HF(DF)激光器[J].红外与激光工程,2007,36(z1):304-306.
[11] Pan Q K,Xie J J,Shao C L,et al.High power electric-discharge non-chain pulsed DF laser[J].Chinese Journal of Lasers,2015,42(7):0702001.潘其坤,谢冀江,邵春雷,等.高功率放电引发非链式脉冲DF激光器[J].中国激光,2015,42(7):0702001.
[12] Yi A P,Liu J R,Tang Y,et al.Electrically initiated repetitive-pulsed non-chain HF lasers[J].Optics and Precision Engineering,2011,19(2):360-366.易爱平,刘晶儒,唐影,等.电激励重复频率非链式HF激光器[J].光学精密工程,2011,19(2):360-366.
[13] Huang K,Tang Y,Yi A P,et al.Characteristics of non-chain discharge-pumped pulse HF laser[J].Infrared and Laser Engineering,2010,39(6):1026-1029.黄珂,唐影,易爱平,等.非链式电激励脉冲HF激光器[J].红外与激光工程,2010,39(6):1026-1029.
[14] Huang K,Yi A P,Zhu F,et al.Discharge initiated non-chain high power repetitively pulsed HF/DF laser[J].High Power Laser and Particle Beams,2015,27(4):041010.黄珂,易爱平,朱峰,等.放电引发的非链式高功率重复频率HF/DF激光器[J].强激光与粒子束,2015,27(4):041010.