Volume 46 Issue 7
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Pan Qikun, Chen Fei, Shi Ningning, Li Dianjun, Xie Jijiang, He Yang, Guo Jin. Theoretical analysis and experimental research on tunable acousto-optic Q-switched CO2 laser[J]. Infrared and Laser Engineering, 2017, 46(7): 705002-0705002(5). doi: 10.3788/IRLA201746.0705002
Citation: Pan Qikun, Chen Fei, Shi Ningning, Li Dianjun, Xie Jijiang, He Yang, Guo Jin. Theoretical analysis and experimental research on tunable acousto-optic Q-switched CO2 laser[J]. Infrared and Laser Engineering, 2017, 46(7): 705002-0705002(5). doi: 10.3788/IRLA201746.0705002
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Theoretical analysis and experimental research on tunable acousto-optic Q-switched CO2 laser

doi: 10.3788/IRLA201746.0705002
  • 1.

    State Key Laboratory of Pulsed Laser Technology,Electronic Engineering Institute,Hefei 230037,China;

  • 2.

    State Key Laboratory of Laser Interaction with Matter,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;

  • 3.

    National Laboratory of Aerospace Intelligent Control Technology,Beijing 100854,China

  • Received Date: 2016-11-10
  • Rev Recd Date: 2016-12-20
  • Publish Date: 2017-07-25
  • A tunable acousto-optic Q-switched CO2 laser was presented using a blazed grating. The tuning principle of CO2 laser was analyzed, and it was found that changing the intra-cavity loss of lines is an effective way to realize the laser wavelength tuning. Then the relationship between diffraction efficiency of blazed grating and the laser wavelength were researched. The theoretical calculations show that the grating has highest diffraction efficiency when the auto-collimating angle of laser line equals to blaze angle of grating. Two blazed gratings with blaze angle of 31.97 (blaze wavelength 10.59 m) and 28.71(blaze wavelength 9.60 m) were employed and the tuning performances of acousto-optic Q-switched CO2 laser were researched on experiments. Laser emission lines of 65 and 75 were obtained separately. The emission lines were richer when blaze wavelength of grating equals to the laser wavelength with lower gain, which accorded with the theoretical calculations. When the repetition frequency is 1 kHz, the maximum average power of 4.2 W, pulse width of 160 ns, peak power of 26.25 kW are achieved at the wavelength of 10.59 m, showing good stability.
  • [1] Kovacs M, Dryden G, Pohieb R, et al. HI-CLASS on AEOS:large aperture laser radar for space surveillance/situational awareness investigations[C]//SPIE, 2001, 4490:298-306.
    [2] Nasrullah I, Kiichiro K, Fujio S, et al. Analysis of heavy metal pollution in soil using transversely excited atmospheric CO2 laser-induced plasma by trapping the soil in microstructured holes on metal subtargets[J]. Applied Spectroscopy, 2007, 61(12):1344-1351.
    [3] Zelinger Z, Strrizik M, Kubat P. Dispersion of light and heavy pollutants in urban scale models:CO2 laser photoacoustic studies[J]. Applied Spectroscopy, 2009, 63(4):430-436.
    [4] David A B, Emeyr S L, Goto S W. High pulse repetition frequency,multiple wavelength, pulsed CO2 radar system for atmospheric transmission and target reflectance measurements[J]. Applied Optics, 1992,31(21):4224-4232.
    [5] Fxavog F R, Moeker H W. Rapidly tunable CO2 TEA laser[J]. Applied Optics, 1982, 21(22):3986-3987.
    [6] Qu Yanchen, Ren Deming, Hu Xiaoyong, et al. Research of rapidly tuning technology of miniature TEA CO2 laser[J]. Laser Technology, 2003, 27(6):547-550. (in Chinese)曲彦臣, 任德明, 胡孝勇, 等. 小型TEA CO2激光器的快速调谐技术研究[J]. 激光技术, 2003, 27(6):547-550.
    [7] Ren Deming, Wang Yuanhu, Qu Yanchen, et al. Rapidly tuned TEA CO2 laser by a scanning mirror[J]. Chinese Journal of Lasers, 2007, 34(8):1027-1031. (in Chinese)任德明, 王元虎, 曲彦臣, 等. 采用扫描振镜方式的快调谐TEA CO2激光器的研究[J]. 中国激光, 2007, 34(8):1027-1031.
    [8] He Yang, Lu Jun, Chen Fei, et al. Experimental researches on acousto-optic Q-switched CO2 laser[J]. Infrared and Laser Engineering, 2015, 44(8):2280-2285. (in Chinese)何洋, 陆君, 陈飞, 等. 声光调Q CO2激光器实验研究[J]. 红外与激光工程, 2015, 44(8):2280-2285.
    [9] Xie Jijiang, Pan Qikun, Li Dianjun, et al. Theoretical calculation and experimental study of acousto-optically Q-switched CO2 laser[J]. Chinese J Lasers, 2011, 38(2):0202004. (in Chinese)谢冀江, 潘其坤, 李殿军, 等. 声光调Q CO2激光器的理论计算和实验研究[J]. 中国激光, 2011, 38(2):0202004.
    [10] Xie Jijiang, Pan Qikun, Guo Ruhai, et al. Dynamical analysis of acousto-optically Q-switched CO2 laser[J]. Optics and Lasers in Engineering, 2012, 50(2):159-164.
    [11] Guo Jin, Li Dianjun, Wang Tingfeng, et al. High Power CO2 Laser and Its Application Technology[M]. Beijing:Science Press, 2013. (in Chinese)郭劲, 李殿军, 王挺峰, 等. 高功率CO2激光器及其应用技术[M]. 北京:科学出版社, 2013.
    [12] Smith K, Thomson R M. Computer Modeling of Gas Laser[M]. New York:Plenum Press, 1978.
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Theoretical analysis and experimental research on tunable acousto-optic Q-switched CO2 laser

doi: 10.3788/IRLA201746.0705002
  • 1. State Key Laboratory of Pulsed Laser Technology,Electronic Engineering Institute,Hefei 230037,China;
  • 2. State Key Laboratory of Laser Interaction with Matter,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;
  • 3. National Laboratory of Aerospace Intelligent Control Technology,Beijing 100854,China
  • Received Date: 2016-11-10
  • Rev Recd Date: 2016-12-20
  • Publish Date: 2017-07-25

Abstract: A tunable acousto-optic Q-switched CO2 laser was presented using a blazed grating. The tuning principle of CO2 laser was analyzed, and it was found that changing the intra-cavity loss of lines is an effective way to realize the laser wavelength tuning. Then the relationship between diffraction efficiency of blazed grating and the laser wavelength were researched. The theoretical calculations show that the grating has highest diffraction efficiency when the auto-collimating angle of laser line equals to blaze angle of grating. Two blazed gratings with blaze angle of 31.97 (blaze wavelength 10.59 m) and 28.71(blaze wavelength 9.60 m) were employed and the tuning performances of acousto-optic Q-switched CO2 laser were researched on experiments. Laser emission lines of 65 and 75 were obtained separately. The emission lines were richer when blaze wavelength of grating equals to the laser wavelength with lower gain, which accorded with the theoretical calculations. When the repetition frequency is 1 kHz, the maximum average power of 4.2 W, pulse width of 160 ns, peak power of 26.25 kW are achieved at the wavelength of 10.59 m, showing good stability.

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