10 November 2003 Continuous long laser spark produced with a conical mirror and CO2 laser
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Proceedings Volume 5120, XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; (2003) https://doi.org/10.1117/12.515835
Event: XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2002, Wroclow, Poland
Abstract
The feasibility of producing continuous laser sparks (CLSs) with a resistance per unit length of 100-400 Ω/cm by focusing radiation from CO2 laser with a conical mirror is demonstrated. The laser energy input per unit length required for this is experimentally found to be equal to ~200 J/m. The possibility to efficiently control the trajectory of an electric discharge by means of a CLS is demonstrated. A CLS is found to be an analogue of a high-conductivity metal rod during the electric breakdown and electric potential transfer. The effect of polarity in the electric breakdown of air gaps between the CLS plasma channel and a metal rod is discovered and interpreted. The transverse structure of the CLS conductivity is investigated. Most likely the CLS conductivity at the initial state is due to the photoionization of air by the radiation of primary nuclei of the optical breakdown.
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Victor V. Apollonov, K. N. Firsov, S. Yu. Kazantsev, Igor G. Kononov, D. N. Polyakov, A. V. Saifulin, L. M. Vasilyak, "Continuous long laser spark produced with a conical mirror and CO2 laser", Proc. SPIE 5120, XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (10 November 2003); doi: 10.1117/12.515835; https://doi.org/10.1117/12.515835
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