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This article is cited in 10 scientific papers (total in 10 papers)
Laser applications and other topics in quantum electronics
Formation of an optical pulsed discharge in a supersonic air flow by radiation of a repetitively pulsed CO2 laser
A. N. Malov, A. M. Orishich Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk
Abstract:
Results of optimisation of repetitively pulsed CO2-laser generation are presented for finding physical conditions of forming stable burning of an optical pulsed discharge (OPD) in a supersonic air flow and for studying the influence of pulse parameters on the energy absorption efficiency of laser radiation in plasma. The optical discharge in a supersonic air flow was formed by radiation of a repetitively pulsed CO2 laser with mechanical Q-switching excited by a discharge with a convective cooling of the working gas. For the first time the influence of radiation pulse parameters on the ignition conditions and stable burning of the OPD in a supersonic air flow was investigated and the efficiency of laser radiation absorption in plasma was studied. The influence of the air flow velocity on stability of plasma production was investigated. It was shown that stable burning of the OPD in a supersonic flow is realised at a high pulse repetition rate where the interval between radiation pulses is shorter than the time of plasma blowing-off. Study of the instantaneous value of the absorption coefficient shows that after a breakdown in a time lapse of 100 — 150 ns, a quasi-stationary "absorption phase" is formed with the duration of ~1.5 ms, which exists independently of air flow and radiation pulse repetition rate. This phase of strong absorption is, seemingly, related to evolution of the ionisation wave.
Keywords:
high-power repetitively pulsed CO2 laser, mechanical Q-switching, supersonic air flow, optical pulsed discharge, air optical breakdown, absorption coefficient of plasma.
Received: 20.04.2012 Revised: 19.06.2012
Citation:
A. N. Malov, A. M. Orishich, “Formation of an optical pulsed discharge in a supersonic air flow by radiation of a repetitively pulsed CO2 laser”, Kvantovaya Elektronika, 42:9 (2012), 843–847 [Quantum Electron., 42:9 (2012), 843–847]
Linking options:
https://www.mathnet.ru/eng/qe14858 https://www.mathnet.ru/eng/qe/v42/i9/p843
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