基态HF分子和介质消耗对重复频率脉冲HF激光输出的影响
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摘要
研究了氟化氢(HF)分子浓度以及工作介质消耗对激光脉冲能量的影响。受激光器内基态HF分子对激光的再吸收以及对激发态分子强弛豫的影响,激光脉冲能量随着激光器内HF分子浓度的升高而明显下降,HF分子浓度每增加1×10~(15) cm~(-3),激光脉冲能量约下降1.15%。1个激发态HF分子约产生0.8个光子,放电区内SF_6气体的分解率约为1%,单次放电过程中激光器内所消耗的工作介质较少,约为气体总量的1/(2×10~5)。实验结果表明:HF分子浓度对激光脉冲能量的影响较大,介质消耗对激光脉冲能量影响较小;通过在激光器内加入分子筛,可以将HF浓度控制在1.8×10~(15) cm~(-3)的水平。在两个因素的共同影响下,激光脉冲能量下降率约为10%。
The influences of the concentration of HF molecular and the consumption of the working medium on the laser pulse energy are studied. The laser pulse energy decreases obviously with the increasing of the concentration of HF molecular in the laser, due to the reabsorption of the HF molecule on laser and the strong relaxation effect of the HF molecule on the excited molecules. The laser pulse energy decreases about 1.15% with the increasing of the concentration of HF molecular for 10~(15) cm~(-3). In addition, each excited HF molecule can emit 0.8 photons, the dissociation rate of SF_6 molecules in the discharge region is about 1%, and the consumption of the working medium is small for a single discharge process and the consumption is about 1/(2×10~5) of the total gas amount. The experimental results show that the laser pulse energy is affected seriously by the HF molecular concentration, but weakly by the medium consumption. With the add of the molecular sieves in the laser chamber, the HF molecular concentration is maintained at a level of 1.8×10~(15) cm~(-3), and the laser pulse energy decreases about 10% under the coaction of two factors.
The influences of the concentration of HF molecular and the consumption of the working medium on the laser pulse energy are studied. The laser pulse energy decreases obviously with the increasing of the concentration of HF molecular in the laser, due to the reabsorption of the HF molecule on laser and the strong relaxation effect of the HF molecule on the excited molecules. The laser pulse energy decreases about 1.15% with the increasing of the concentration of HF molecular for 10~(15) cm~(-3). In addition, each excited HF molecule can emit 0.8 photons, the dissociation rate of SF_6 molecules in the discharge region is about 1%, and the consumption of the working medium is small for a single discharge process and the consumption is about 1/(2×10~5) of the total gas amount. The experimental results show that the laser pulse energy is affected seriously by the HF molecular concentration, but weakly by the medium consumption. With the add of the molecular sieves in the laser chamber, the HF molecular concentration is maintained at a level of 1.8×10~(15) cm~(-3), and the laser pulse energy decreases about 10% under the coaction of two factors.
引文
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[14] 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
[15] 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): 51-55. 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): 51-55.
[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] Vasil′ev B I, Mannoun O. IR differential-absorption lidars for ecological monitoring of the environment[J]. Quantum Electronics, 2006, 36(9): 801-820.
[4] Guo J Z, Wang J, Zhao H T, et al. Output spectrum of continuous wave hydrogen fluoride laser[J]. Laser & Optoelectronics Progress, 2018, 55(2): 021404. 郭建增, 王杰, 赵海涛, 等. 连续波氟化氢激光输出光谱特性研究[J]. 激光与光电子学进展, 2018, 55(2): 021404.
[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] Apollonov V V, Kazantsev S Y, Saifulin A V, et al. Discharge characteristics in a nonchain HF(DF) laser[J]. Quantum Electronics, 2000, 30(6): 483-485.
[8] 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.
[9] Ke C J, Tan R Q, 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.
[10] 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.
[11] 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.
[12] 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.
[13] Yi A P, Liu J R, Tang Y, et al. Electrically initiated repetitive-pulsed non-chain HF laser[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.
[14] 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
[15] 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): 51-55. 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): 51-55.