Samples of nominal composition Bi,_._,Pb,Sb,Sr,Ca,Cu,O (x = 0 -0.8, y = 0 -0.3) were prepared and investigated by x-ray, DTA, TG and microprobe analyses. T, was measured by resistive and magnetic (DC susceptibility) methods. The addition of antimony exerted a stabilizing influence on the formation of the 2223 phase, the solubility of Sb being 60.1 mole. The optimal temperatures of t h e formation of the 2223 phases with dinerent Pb a n d S b content are in the range 83W4O"C. Deviation from the optimal temperature of about 1-2°C can b e the cause of a sharp decrease in the volume of the 2223 phase. The anomalies at 240 K revealed a temperature dependence of resistance and magnetic susceptibility for some samoles with and without Sb
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.
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