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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 experimental study of a repetitively pulsed chemical HF laser operating on a chain reaction F 2 +H 2 , initiated by the barrier electrical discharge with the inter-electrode gap 10 cm, with length of active medium 40 cm along optical axis has been carried out. The barrier electrical discharge with duration about 120 ns has shown a high stability, reliability and homogeneity at specific energy deposits up to 60 J / l.At the repetition pulses rate 10 Hz with the depleted fluorine-hydrogen mixture (20 % F 2 , 5 % H 2 ), the mean laser power 500 W (a specific energy for one laser pulse E/V ≈ 11.6 J / l, technical efficiency of 15.6 %) is achieved.In the single pulse mode of the laser operation with the mixture 30 % F 2 , 12 % H 2 the maximum pulse energy E max = 100 J, the specific radiation energy E/V = 24 J / l, the technical efficiency η tech = 28.4 % are obtained.

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