HF repetitively pulsed chemical laser with a large discharge gap operating on the mixture F 2 + H 2

Abstract

The efficient repetitively pulsed ( 1 0 Hz) HF chemical laser initiated by barrier electric discharge with electrode gap 10 cm was realised. In mono-pulse mode specific output energy 3 and 23 J/l, tecimical efficiency (ri) 3.4 and 26%, for nonchain and chain process, correspondingly, were obtained. In the repetitively pulsed (RP) mode of the laser operation at 10 Hz on the depleted fluorine-hydrogen mixture (20 % F2, 5 % H2) the mean laser power of 43 W was obtained (specific output energy E/V'40 J/l, r=l 1.3%). The computational prediction for laser operation in repetitively pulsed mode at active length of about 0.5 m has shown the possibility of achievement of the specific laser energy about 1 5 J/l and technical efficiency up to 20 % . Output laser specific energy 14 J/l under RPCL conditions at length of active medium 0.37 m in mono-pulse mode was obtained in a good agreement with numerical prediction.

The repetitively pulsed electro-discharge HF laser on chain chemical reaction F 2 +H 2

“…An effective method to increase the limiting pressure is to use a discharge circuit of short pulse. Really, decrease of duration of the discharge pulse down to 50-70 ns stimulated a growth of the limiting pressure, a contraction of the barrier discharge in SF 6 occurred at pressure 20-25 kPa 9 . At the same time, in conditions of our experiment the increase of the current pulse duration from 220 up to 400 ns due to increase of a circuit inductance resulted in decrease of the limiting pressure of the discharge contraction occurrence in SF 6 from 10 down to 6 kPa.…”

“…8 and 440 cm 3 , Ref. 9,10 . In this work the results of study of characteristics of the pulsed and repetitively pulsed chemical HF lasers with the active volume 10 х 10.5 х 40 = 4200 cm 3 and the discharge gap 10 cm are presented.…”