Relation Between Discharge Length and Laser Pulse Characteristics in Longitudinally Excited CO2 Laser

  • Kazuyuki Uno
  • Kazuma Dobashi
  • Tetsuya Akitsu
  • Takahisa Jitsuno


A longitudinally excited CO2 laser pumped by a fast discharge emits a short laser pulse, similarly to TEA and Q-switched CO2 lasers. We investigated the relation between the discharge length and the laser pulse characteristics to develop a longitudinally excited CO2 laser producing a high spike laser pulse. We examined discharge lengths of 30, 45, and 60 cm, using the same mirrors and the same excitation circuit with the same input energy. A longer discharge length increased the discharge volume and improved the laser output energy. However, the longer discharge length caused a long discharge formation time (a slow fall time of the discharge voltage) due to the higher discharge impedance, which resulted in a long laser pulse tail. Therefore, the longitudinally excited CO2 laser had optimum conditions for obtaining a high spike laser pulse effectively.


Longitudinal excitation CO2 laser Fast discharge Laser pulse shape 


  1. 1.
    K. Uno, K. Nakamura, T. Goto, and T. Jitsuno, J. IR. mm. THz. Wave. 30, 1123-1130 (2009).Google Scholar
  2. 2.
    K. Uno, T. Jitsuno, and T. Akitsu, J. IR. mm. THz. Wave. 33, 485-490 (2012).Google Scholar
  3. 3.
    H.-J. Chung, D.-H. Lee, J.-H. Hong, J.-H. Joung, Y.-M. Sung, S.-J. Park, and H.-J. Kim, Rev. Sci. Instrum. 73, 484-485 (2002).Google Scholar
  4. 4.
    M. M. T. Loy, and P. A. Roland, Rev. Sci. Instrum. 48, 554-556 (1977).CrossRefGoogle Scholar
  5. 5.
    S. V. Deshmukh and C. Rajagopalan, Opt. Laser Technol. 35, 517-521 (2003).CrossRefGoogle Scholar
  6. 6.
    V. M. Orlovskii, A. N. Panchenko, and V. F. Tarasenko, Quantum Electron. 40, 192-194 (2010).CrossRefGoogle Scholar
  7. 7.
    N. Menyuk, and P. F. Moulton, Rev. Sci. Instrum. 51, 216-220 (1980).CrossRefGoogle Scholar
  8. 8.
    J. W. Bethel, H. J. Baker, D. R. Hall, Opt. Commun. 125, 352-358 (1998).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Kazuyuki Uno
    • 1
  • Kazuma Dobashi
    • 1
  • Tetsuya Akitsu
    • 1
  • Takahisa Jitsuno
    • 2
  1. 1.Interdisciplinary Graduate School of Medicine and EngineeringUniversity of YamanashiKofuJapan
  2. 2.Institute of Laser EngineeringOsaka UniversitySuitaJapan

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