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Undamped undulation superposed on the passive Q-switching pulse of a CO2 laser

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Abstract

An undamped undulation superposed on the pulse tail of the passive Q-switching is observed using HCOOH gas as a saturable absorber. The pulse shapes with the undulation are nicely reproduced through the rate-equation analysis in which the laser gain medium is described as a three-level system. Good agreements between the observation and the calculation are also obtained in the dependence of the period and the width of passive Q-switching pulse on laser parameters. The mechanism of the undulation is interpreted as the relaxation oscillation attributed to the relaxation from the lower laser level. The collisional rate constant of HCOOH molecule is also obtained.

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Author notes

  1. K. Tanii

    Present address: Chiyoda Institute of Technology, Taitoku, 110, Tokyo, Japan

Authors and Affiliations

  1. Department of Physics, University of Tokyo, Bunkyo-ku, 113, Tokyo, Japan

    M. Tachikawa, K. Tanii, M. Kajita & T. Shimizu

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  1. M. Tachikawa
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  2. K. Tanii
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  3. M. Kajita
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  4. T. Shimizu
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Tachikawa, M., Tanii, K., Kajita, M. et al. Undamped undulation superposed on the passive Q-switching pulse of a CO2 laser. Appl. Phys. B 39, 83–90 (1986). https://doi.org/10.1007/BF00694802

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  • DOI: https://doi.org/10.1007/BF00694802

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