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OPERATING CHARACTERISTICS OF A TRANSVERSE‐FLOW DF–CO2 PURELY CHEMICAL LASER
1.T. A. Cool and R. R. Stephens, J. Chem. Phys. 51, 5175 (1969);
1.T. A. Cool and R. R. Stephens, Appl. Phys. Letters 16, 55 (1970).
2.T. A. Cool, J. Appl. Phys. 40, 3563 (1969).
3.T. A. Cool and J. A. Shirley, Appl. Phys. Letters 14, 70 (1969).
4.An injector consisting of two 0.065‐in. ‐diameter tubes placed one above the other and aligned along the 15‐cm dimension was also successful. These tubes were fed from manifolds at two locations along their length and injection was accomplished with a staggered array of 196 jets from 0.005‐in. ‐diameter orifices.
5.Operation was also investigated in the absence of an initial steady‐state F atom population by postponing the NO injection by premixing it with the instead of the (Fig. 1). The DF formation rate was much slower for a given NO concentration for that case; thus, a much increased NO flow was necessary to provide power outputs comparable to those of the present arrangement.
6.N. Dyeu, T. Kan, and G. J. Wolga, J. Quantum Electron QE‐4, 256 (1968).
7.This method required a measurement of the squared ratio of pressures at the downstream sonic throat before and after reaction was stopped by shutting off the NO flow, leaving all other flows unchanged.
8.The gain coefficients were calculated for a total pressure of 15.4 Torr for a mixture of 32% and 68% He (neglects broadening contributions of the small amounts of DF, NO, NOF, and in the flow). The effects of both pressure broadening and Doppler broadening were considered. Optical broadening cross sections of and for and collisions, respectively. A spontaneous emission lifetime of 5.38 sec was used for all transitions. (Sources for these data are given in Ref. 2).
9.The relationship has been used here, where the bars denote spatial averages over the beam cross section. The quantities and where L is the optical path length of the cavity, correspond to the definitions given in Eqs. (39) and (40) of Ref. 2, if the differences between the present multimode operation and the plane‐wave analysis of Ref. 2 can be neglected. An absorption loss of 1% was assumed for the single‐pass oscillator.
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