High-power pulse and pulse-periodic nonchain HF (DF) lasers

Victor V. Apollonov; Andrei A. Belevtsev; Konstantin N. Firsov; Sergey Yu. Kazantsev; Alexei V. Saifulin

doi:10.1117/12.460146

26 March 2002 High-power pulse and pulse-periodic nonchain HF (DF) lasers

Victor V. Apollonov, Andrei A. Belevtsev, Konstantin N. Firsov, Sergey Yu. Kazantsev, Alexei V. Saifulin

Proceedings Volume 4747, International Conference on Atomic and Molecular Pulsed Lasers IV; (2002) https://doi.org/10.1117/12.460146
Event: International Conference on Atomic and Molecular Pulsed Lasers IV, 2001, Tomsk, Russian Federation

Abstract

This paper reports on the physics of a self-sustained volume discharge without preionization, self-initiated volume discharge (SIVD), in working mixtures of nonchain HF(DF) lasers. Dynamics of SIVD in discharge gaps of different geometry is thoroughly described. The mechanisms of restricting current density in a diffuse channel in electric discharges in SF₆ and SF₆ based mixtures determining the possibility of the existence of SIVD were suggested and analyzed using simple models. It is shown that the most probable mechanisms are the electron impact dissociation of SF₆ and other mixture components, electron-ion recombination and electron attachment to vibrationally excited SF₆ molecules. Starting from a comparison analysis of the rate coefficients of these processes, it was found that the electron-ion recombination is capable of compensating for electron detachment from negative ions by electron impact. It is established that SIVD can be observed not only in SF₆, but in other strongly electronegative gases, e.g., in C₃F₈ and C₃HCl₃. Analysis is given of the factors determining uniformity of active medium in nonchain HF(DF) lasers. Some special features of operating nonchain HF(DF) lasers with small, 2 divided by 6 cm, apertures are carefully examined and the results of measuring the nonchain HF(DF) laser divergence are presented. Consideration is given to the problem increasing the aperture and discharge volume of nonchain HF(DF) lasers and, based from the experimental results, the possibility is shown of increasing their energy to a level of approximately 1 kJ and above.

Citation Download Citation

Victor V. Apollonov, Andrei A. Belevtsev, Konstantin N. Firsov, Sergey Yu. Kazantsev, and Alexei V. Saifulin "High-power pulse and pulse-periodic nonchain HF (DF) lasers", Proc. SPIE 4747, International Conference on Atomic and Molecular Pulsed Lasers IV, (26 March 2002); https://doi.org/10.1117/12.460146

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