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Proceedings Paper

Improving discharge-initiated HF/DF lasers using chain reaction
Author(s): Bernard Lacour; Vincent Puech; Boris Sergievitch Alexandrov; Constantin Alexandrovitch Kutumov; Evgueni Alexandrovitch Klimuk; Georgyi Andreievitch Troschinenko
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Paper Abstract

A few years ago, it has been demonstrated that the use of hydrocarbons such as C2H4 or C6H12 as hydrogen donor allows realizing high-volume discharges in SF6 based non-chain HF/DF gas mixture. However, for some uses, the specific output energy, the efficiency and, to a less extent, the optical quality of all these lasers remain insufficient. It appears now that the only way to increase these values is to use chain reaction. But chain reaction is known to be delicate to control, especially when working at high repetition rate. This paper will describe recent work directed towards a better understanding of the discharge mechanisms and an increase of the efficiency and of the specific output energy of HF/DF pulsed lasers by using chain reaction in discharge initiated repetitive and non-repetitive experiments. High volume discharge cells compatible with repetition rate have been realized. Discharge initiated repetitive chain reaction has been studied up to 10Hz with large gap. Efficiencies as high as 70% have been obtained in single pulse experiments. Computer modeling allows now predicting satisfactorily the performances of discharge-initiated chain reaction HF/DF lasers as a function of electric circuit characteristics and gas composition.

Paper Details

Date Published: 20 September 2004
PDF: 8 pages
Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.546719
Show Author Affiliations
Bernard Lacour, LPGP, CNRS and Univ. de Paris-Sud (France)
Vincent Puech, LPGP, CNRS and Univ. de Paris-Sud (France)
Boris Sergievitch Alexandrov, Russian Scientific Ctr. (Russia)
Constantin Alexandrovitch Kutumov, Russian Scientific Ctr. (Russia)
Evgueni Alexandrovitch Klimuk, Russian Scientific Ctr. (Russia)
Georgyi Andreievitch Troschinenko, Russian Scientific Ctr. (Russia)

Published in SPIE Proceedings Vol. 5448:
High-Power Laser Ablation V
Claude R. Phipps, Editor(s)

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