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.
High efficiency optical pumping of4-.tm HBr-laser was performed by the principal 2P9 line (3.836 jtm) of pulsed DF-laser. Precise coincidence revealed of this laser transition with R2 line of the fundamental absorption band of the heavy isotopomer ofhydrogen bromide was utilized. Lasing within 0.3 -15 Ton pressure range was observed in overall (4.0 17-4.215) tm spectral range, at both off-axis and the collinear pumping geometry (pump fluence of 0.2 -0.4 J/cm2, pulse FWHM duration ' 300 ns). Complex behaviour of HBr-laser emission peak intensity, pulse duration and time delay upon the gas pressure was analyzed. Energy conversion efficiency at P =10 Ton was increased from ' 2 % to more than 5%, when collinear scheme with better mode-matching was utilized. It is believed that the efficiency may be additionally improved by optimization ofHBr-laser cavity losses.
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