Abstmct-A laser cell with 2 1 of excitation volume was used to study the electron-beam pumped KIF laser system at excitation rates of 1.8-7.0 MW/cm3. The system was optimized as an oscillator for various mixtures of Ar, Kr, and F2 at total pressures of 1000 and 2500 torr.The resulting optimum conditions gave an intrinsic efficiency (laser energy out/electron-beam energy deposited) of 12 percent for the 1000 torr total pressure mixture with an output energy of 11 J/1. An efficiency of 10 percent with an output of 40 J/1 was obtained for the 2500 torr mixture. The system was then used as an amplifier to measure the extracted power as a function of input power for the two mixtures. The small-signal gain go, the nonsaturable absorption a, and the saturation intensity I, were determined for the two mixtures.Analysis of the data gave go = 16-18 percent/cm, a! = 0.75-1.25 percent/cm, and Z , = 2 MW/cm2 for the 1000 torr mixture andgo = 17-19 percent/cm, a! = 1.0-1.5 percent/cm, and Z , = 9 MW/cm2 for the 2500 torr mix.
Chain-reaction lasing of mixtures of F2, O2, and H2 at pressure ratios of 1/0.3/0.25 with F2 pressures up to 800 Torr was initiated with an electron beam, and a parametric study of laser emission was performed. In one series of studies the F2 and O2 pressures were held constant while the hydrogen pressure was varied up to stoichiometric. Under some conditions, SF6 or He was added to the above mixtures. A maximum laser energy of 4.2 kJ was measured at the higher pressures. Chemical and electrical efficiencies of up to 11.4% and 180%, respectively, were obtained. Each of these efficiencies has been found to be dependent upon the gas pressure and composition. The measured laser energy was found to be proportional to the measured electron-beam energy deposited in the gas. Addition of an unstable resonator provided a beam with a 4-mrad divergence.
Highefficiency, highenergy operation of an intense electron beam initiated HF chemical laser using a mixture containing a heavy fluoride MoF6 Appl. Phys. Lett. 49, 122 (1986); 10.1063/1.97198High efficiency multikilojoule HF chemical lasers using an electron beam initiated lowpressure mixture of H2/F2/NF3 or H2/F2/SF6 Appl. Phys. Lett. 48, 266 (1986); 10.1063/1.96576Highefficiency multikilojoule deuterium fluoride (DF) chemical lasers initiated by intense electron beams
Characteristics of a long-pulse, low pump rate, atomic xenon (XeI) laser are described. Energy loading up to 170 J/L at pulse widths between 5 and 55 ms is achieved with an electron beam in transverse geometry. The fraction of energy in each wavelength obtained with electron beam pumping is in good agreement with results from fission fragment pumping in a reactor pumped laser. Values for the small-signal gain coefficient, loss coefficient, and saturation intensity as a function of pump rate are presented. Laser energy as a function of pulse width and the effects of air and CO2 impurities are described. An investigation of the dominant laser wavelength in a high-Q cavity indicates that the 2.6 μm radiation dominates.
Intense 3371Å laser emission from a fast Blumlein discharge excited N2/F2 mixture Appl. Phys. Lett. 34, 31 (1979); 10.1063/1.90587 Energy transfer between electronically excited argon and nitrogen: A kinetic model for the 3371 and the 3577 Å laser emissions
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