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Kvantovaya Elektronika, 2010 Volume 40, Number 6, Pages 484–489 (Mi qe14347)

This article is cited in 7 papers

Active media

Detachment instability of self-sustained volume discharge in active media of non-chain HF(DF) lasers

A. A. Belevtseva, S. Yu. Kazantsevb, I. G. Kononovb, K. N. Firsovb

a Institute of Extremal States Thermophysics, Scientific Association for High Temperatures, Russian Academy of Sciences, Moscow
b Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow

Abstract: The development of detachment instability in active media of electric-discharge non-chain HF(DF) lasers due to the electron-impact detachment of electrons from negative ions is considered. This instability is initiated in large volumes of SF6-based gas mixtures, spatially separated from electrodes and heated by a pulsed CO2 laser. The self-organisation of self-sustained volume discharge upon laser heating, which results in the formation of quasi-periodic plasma structures within the discharge gap, is experimentally investigated. The evolution of these structures, depending on the gas temperature and specific deposition of electric energy, is analysed. The possible relationship between the self-organisation and detachment instability is discussed. A mechanism of development of single plasma channels in the working media of HF(DF) lasers, based on electron-impact destruction of negative ions is proposed.

PACS: 42.55.Ks, 52.80.-s

Received: 21.04.2010


 English version:
Quantum Electronics, 2010, 40:6, 484–489

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