封闭水平管道中气体压强对激光传输的影响

胡鹏; 安建祝; 张飞舟

doi:doi:10.3788/cjl201340.0702005

中国激光, 2013, 40 (7): 0702005, 网络出版: 2013-05-15

封闭水平管道中气体压强对激光传输的影响

Pressure Effects on Laser Propagation in a Closed Horizontal Tube

论文大纲

胡鹏 ^*安建祝张飞舟

作者单位

北京应用物理与计算数学研究所, 北京 100088

激光光学热晕气体压强光束质量转换时间 laser optics thermal blooming gas pressure beam quality switch time

摘要

建立了封闭水平管道中激光传输热效应物理模型，详细研究了降低气体压强对光束质量变化的影响，辨别了热传导、浮力对流传热机制的转换时间与光束质量、光斑质心漂移转换时间的关系；数值模拟了气体吸收不同激光能量，在不同压强下的温度分布、附加相差和远场光束质量、光斑质心漂移的变化。结果表明，气体温度分布与气体热光系数两种因素共同决定远场光束质量变化的大小，而光束质量转换时间与两种传热机制转换时间一致，光斑质心漂移转换时间略有滞后；降低管道中气体压强，可较大地改善远场光束质量。

Abstract

A model of a thermal blooming gas in a closed horizontal tube is used to study the effects of gas pressure on laser propagation. It focuses on the variation of beam quality in far-field and the switch time of heat conduction and heat convection in gas. By numerical simulation, the distributions of gas temperature, additional phase and beam quality and drift of mass center in far-field are shown under different gas pressures and absorptions of laser energy. And it is found that the change of beam quality is decided by both of the distribution of gas temperature and the thermal-optical coefficient, and the switch time of beam quality accords with the one between the two thermal conduction mechanisms, but the switch time of drift of mass center delays. Reducing the pressure in the tube, the gas has a higher temperature, but more even distribution, and the thermal-optical coefficient of gas scales down, so the beam quality consequently improves.

参考文献

[1] Jianzhu An, Youkuang Li, Xiangwan Du. Thermal effects of a laser beam tube consisting of a window and nonflowing gas［J］. Opt. Lett., 2004,29(24): 2899～2901

[2] 季小玲, 陶向阳, 吕百达. 激光非均匀性和内光路热效应对远场特性的影响［J］. 中国激光, 2004, 31(10): 1193～1197

Ji Xiaoling, Tao Xiangyang, Lü Baida. Influence of laser non-uniformity and thermal effects in an inner optical system on the far-field behavior［J］. Chinese J. Lasers, 2004, 31(10): 1193～1197

[3] 金刚, 柳顺发, 李树民等. 激光热效应对光束控制系统发射光束质量的影响［J］. 中国激光, 2002, 29(10): 895～899

Jin Gang, Liu Shunfa, Li Shumin et al.. Laser thermal effects in beam control system on the emitted laser quality［J］. Chinese J. Lasers, 2002, 29(10): 895～899

[4] 柳建, 刘顺发, 金刚. 封闭充气管道中气体热效应对激光传输的影响［J］. 光电子·激光, 2004, 15(1): 100～103

Liu Jian, Liu Shunfa, Jin Gang. Thermal effects on laser propagating in a closed tube with air［J］. J. Optoelectronics·Laser, 2004, 15(1): 100～103

[5] 柳建, 李树民, 金刚等. 沿Z型光传输管道轴向吹气对激光传输的影响［J］. 强激光与粒子束, 2005, 17(2): 164～168

Liu Jian, Li Shumin, Jin Gang et al.. Influence on beam propagation through Z-shape tube of blowing non-absorbing gas in［J］. High Power Laser and Particle Beams, 2005, 17(2): 164～168

[6] 柳建, 王世庆, 金刚等. 吹气抑制气体热效应时管道结构对光传输的影响［J］. 强激光与粒子束, 2007, 19(3): 391～393

Liu Jian, Wang Shiqing, Jin Gang et al.. Effect of tube structure on beam propagation when depressing thermal effect by blowing［J］. High Power Laser and Particle Beams, 2007, 19(3): 391～393

[7] 陶文铨. 数值传热学(第二版)［M］. 西安：西安交通大学出版社，2001. 240～245

Tao Wenquan. Numerical Heat Transfer (Second Edition)[M]. Xi′an: Xi′an Jiaotong University Press, 2001. 240～245

[8] Marvin J. Weber. Handbook of Optical Material[M]. Boca Raton: CRC Press, 2003

[9] 杜祥琬. 实际强激光远场靶面上光束质量的评价因素[J]. 中国激光, 1997, 24(4): 327~332

Du Xiangwan. Factors for evaluating beam quality of a real high power laser on the target surface in far field[J]. Chinese J. Laser, 1997, 24(4): 327~332

[10] 李新阳, 鲜浩, 王春鸿等. 波像差与光束质量因子的关系[J]. 中国激光, 2005, 32(6): 798~802

Li Xinyang, Xian Hao, Wang Chunhong et al.. Relationship between beam quality factor and wavefront error[J]. Chinese J. Laser, 2005, 32(6): 798~802

胡鹏, 安建祝, 张飞舟. 封闭水平管道中气体压强对激光传输的影响[J]. 中国激光, 2013, 40(7): 0702005. Hu Peng, An Jianzhu, Zhang Feizhou. Pressure Effects on Laser Propagation in a Closed Horizontal Tube[J]. Chinese Journal of Lasers, 2013, 40(7): 0702005.

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