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Multiple breakdown in helium generated by hybrid 10 μm Co2 laser pulses

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Abstract

In this paper we describe the experimental investigation of the post-breakdown development of a helium plasma generated by a hybrid 10 μm CO2 laser pulse. As a result we found that a long tail and a high energy of the CO2 laser pulse cause multiple successive breakdown in the gas. We have measured the time to the first breakdown and the time between first and second breakdown as functions of gas pressure and laser pulse peak intensity as well as the spatial intensity distribution of the transmitted laser pulse. Among the relevant mechanisms self-focusing is not observed before the second breakdown.

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Authors and Affiliations

  1. Institute of Quantum Electronics, ETH (Swiss Federal Institute of Technology), CH-8093, Zürich, Switzerland

    T. L. Kopiczynski, M. Bogdan, A. W. Kälin, H. J. Schötzau & F. K. Kneubühl

  2. Institute of Fluid-Flow Machines, Academic guest from the Polish Academy of Sciences, PL-80-952, Gdańsk, Poland

    T. L. Kopiczynski & H. J. Schötzau

Authors
  1. T. L. Kopiczynski
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  2. M. Bogdan
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  3. A. W. Kälin
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  4. H. J. Schötzau
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  5. F. K. Kneubühl
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Kopiczynski, T.L., Bogdan, M., Kälin, A.W. et al. Multiple breakdown in helium generated by hybrid 10 μm Co2 laser pulses. Appl. Phys. B 54, 526–530 (1992). https://doi.org/10.1007/BF00325520

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  • DOI: https://doi.org/10.1007/BF00325520

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