Volume 47 Issue 12
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Ke Changjun, Wu Tianhao, Kong Xinyi, Zhong Yanhong, Wu Jin. TE CO2 laser narrow pulse modification based on a pinhole plasma shutter[J]. Infrared and Laser Engineering, 2018, 47(12): 1206007-1206007(4). doi: 10.3788/IRLA201847.1206007
Citation: Ke Changjun, Wu Tianhao, Kong Xinyi, Zhong Yanhong, Wu Jin. TE CO2 laser narrow pulse modification based on a pinhole plasma shutter[J]. Infrared and Laser Engineering, 2018, 47(12): 1206007-1206007(4). doi: 10.3788/IRLA201847.1206007
shu

TE CO2 laser narrow pulse modification based on a pinhole plasma shutter

doi: 10.3788/IRLA201847.1206007
  • 1.

    Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China;

  • 2.

    University of Chinese Academy of Sciences,Beijing 100049,China

  • Received Date: 2018-07-11
  • Rev Recd Date: 2018-08-20
  • Publish Date: 2018-12-25
  • The typical pulse from a TE CO2 laser consists of a 100 ns sharp spike followed by a long tail region spanning about 3-5 s. A simple pinhole plasma shutter was employed for eliminating the long tail part of the pulse due to strong laser absorption and scattering. Moreover, it remained the sharp spike of the pulse, thus the pulse width was modified. The shaped laser pulse waveforms at different pinhole positions were measured. The relationships between the laser pulse width, laser energy and defocus length were obtained, the pulse width of the CO2 laser from 110 ns to 50 ns was varied using the method. Further study indicates that the life of the pinhole plasma shutter is mainly determined by the laser pulse energy, repetition frequency, and shaped pulse width. It is shown that this plasma shutter will be used as a tool for short CO2 laser pulse shaping in the search for EUV source and lidar development.
  • [1] Nilaya J Padma, Saiprasad M B. Generation of continuously tunable 5m um coherent radiation by second harmonic conversion of the emission of a multi-atmosphere TE CO2 laser in AgGaSe2[J]. Laser Physics, 2014, 24(8):085401.
    [2] Fried N M, Fried D. Comparison of Er:YAG and 9.6m TE CO2 lasers for ablation of skull tissue[J]. Lasers in Surgery and Medicine, 2002, 28(4):335-343.
    [3] Wang Yunfei, Wu Jin, Liu Shiming. Tuning characteristics of long pulse TE CO2 lasers[J]. Infrared and Laser Engineering, 2008, 37(2):226-229. (in Chinese)
    [4] Zhang Kuo, Lu Jun, Yang Guilong. Estimation of far field divergence of high power TEA CO2 lasers[J]. Infrared and Laser Engineering, 2015, 44(3):2286-2290. (in Chinese)
    [5] Gasmi T, Zeaiter H A, Ropero G. Plasma-based nitrogen tail pulse shutter for CO2 TEA lidar dial systems[J]. Appled Physics B, 2000, 71(2):169-175.
    [6] Ren Deming, Zhang Lili, Qu Yanchen. Application of plasma switch in TEA CO2 laser multiplication[J]. Chinese Journal of Laser, 2004, 31(9):1061-1064. (in Chinese)
    [7] Tao Y, Tillack M S, Amin N, et al. CO2 laser system for fundamental research related to an extreme ultraviolet lithography source[J]. Review of Scientific Instruments, 2009, 80:123503.
    [8] Harilal S S, Sizyuk T, Sizyuk V. Efficient laser produced plasma extreme ultraviolet sources using grooved Sn targets[J]. Applied Physics Letters, 2010, 96:111503.
    [9] Houtman H, Meyer J. Ultrashort CO2 laser pulse generation by square-wave mode locking and cavity dumping[J]. Optics Letters, 1987, 12(2):87-90.
    [10] Hoshino H, Suganuma T, Asayama T. LPP EUV light source employing high power CO2 laser[C]//SPIE, 2008, 6921:692131.
    [11] Staupendahl G. A novel Q-switched CO2 laser and its applications[J]. Laser Technik Journal, 2014, 11(5):22-25.
    [12] Donnelly T, Mazoyer M, Lynch A, et al. CO2 laser pulse shortening by laser ablation of a metal target[J]. Review of Scientific Instruments, 2012, 83:035102.
    [13] Qua Y, Hu X, Ren D. Research on plasma shutter for pulse-shaping of TEA CO2 laser[C]//SPIE, 2002, 4914:273.
    [14] Bellecc C, Bellucci I, Gaudio P. Clipping the tail of a TE-CO2 laser pulse using a gas breakdown technique for high resolution chemical plume detection[J]. Review of Scientific Instruments, 2003, 74:1064.
    [15] Kenan Qu, Nathaniel J. Laser pulse sharpening with electromagnetically induced transparency in plasma[J]. Physics of Plasmas, 2017, 24:073108.
    [16] Smith D C, Brown R T. Aerosol-induced air breakdown with CO2 laser radiation[J]. Journal of Applied Physics, 1975, 46:1146-1153.
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TE CO2 laser narrow pulse modification based on a pinhole plasma shutter

doi: 10.3788/IRLA201847.1206007
  • 1. Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China;
  • 2. University of Chinese Academy of Sciences,Beijing 100049,China
  • Received Date: 2018-07-11
  • Rev Recd Date: 2018-08-20
  • Publish Date: 2018-12-25

Abstract: The typical pulse from a TE CO2 laser consists of a 100 ns sharp spike followed by a long tail region spanning about 3-5 s. A simple pinhole plasma shutter was employed for eliminating the long tail part of the pulse due to strong laser absorption and scattering. Moreover, it remained the sharp spike of the pulse, thus the pulse width was modified. The shaped laser pulse waveforms at different pinhole positions were measured. The relationships between the laser pulse width, laser energy and defocus length were obtained, the pulse width of the CO2 laser from 110 ns to 50 ns was varied using the method. Further study indicates that the life of the pinhole plasma shutter is mainly determined by the laser pulse energy, repetition frequency, and shaped pulse width. It is shown that this plasma shutter will be used as a tool for short CO2 laser pulse shaping in the search for EUV source and lidar development.

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