The dependence of the specific energy of the high-pressure CO2 laser (4.1 and 1 1.1 atm) with the optical pumping on the resonator losses coefficient and density of the absorbed energy of radiation of the HF laser on transition P1 (8) is studied. The maximal values of the specific (200 J/l) and total (7 J) radiation energy of the high-pressure CO2 laser (1 1.1 atm) are obtained with coefficient oftransformation ofthe pumping radiation energy (X=2.78 jtm) to energy of the Co2 laser radiation (?=lO.6 tm) being equal to -49% (quantum yield 73%), and with parameter of excess of the unsaturated gain (go = 0.1 1/cm) above the lasing threshold (g) m = gc/g 4.
The problem of the increase of the energy conversion efficiency of a broadband CO2 laser amplifier with optical pumping by the multi-frequency HF-laser radiation is considered. To improve the utilization of the pumping radiation and to broaden the amplifier bandwidth the use of a buffered with Xe mixture of the isotopomers of carbon dioxide and nitrous oxide as active medium is proposed. Experimentally and by calculation the coefficients of an unsaturated absorption of '4N2160, '2C'602 and '3C'602 were determined on 19 lines of the pulsed chemical HF-laser which concentrate up to 60 % of its total output energy. The estimations show that the application of a three-component mixture of these molecular gases enables to increase up to 30% the coefficient of the utilization of the pumping radiation at aperture about 1 0 cm.
The results of experimental study and numerical modeling of the high-power photoinitiated pulsed chemical DF/HF lasers operating in modes of free-running and amplification in the cascade scheme "master generator (MG)-amplifier (A)" are presented. The comparative analysis of the laser operation efficiency for these modes with the object of obtaining maximal energy characteristics and radiation brightness is carried out. The maximal specific energy of 40 -50 J/l and the maximal total energy of 2.9 -3.1 kJ at divergence of lO radian are obtained in free-running mode for DF-and HF-laser and values of 12 J/l and 290 J respectively are obtained at divergence of 8x 1 O radian for HF-laser. In mode of MG -A it is obtained in experiment 37 -42 JIl, 2.9 -3.4 kJ. On the base of numerical simulation it is possible to make a forecast as 60 J/l, 10-20 kJ and 5xl0 radian with efficiency >50%.
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