Co2 Lasers Effects and Applications by W. W. Duley PDF

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Example text

The gain was essentially independent of Pa at high gas pressures. , 1970). The system of Bronfin et al. is unusual in that arc-heated N2 is expanded through a supersonic nozzle to mix downstream with a cold CO2, He mixture. This expansion occurs quickly enough that the vibrational temperature of N2 is maintained while its translational temperature is reduced. 6% were reported from this system. So far only cw GDL's have been discussed. 4 35 Gas Dynamic Lasers sonic velocities. , 1971; Marchenko and Prokhorov, 1971; Yatsiv et al, 1972; Christiansen and Hertzberg, 1973).

A full discussion of technical problems associated with such a system can be found in the papers by Hertzberg et al. (1972) and Christiansen and Hertzberg (1973). The reverse process, in which absorbed laser radiation is converted to shaft work, is also possible and the combination of such an engine with a GDL generator would yield an effective power transmission system. Such a system might be used for the transmission of power to orbiting space stations (Hansen and Lee, 1972). Efficient extraction of laser power requires attainment of the highest possible population inversion in the expanded laser mixture.

Nevertheless great care must be taken to eliminate such sources of fluctuation as thermal changes in the refractive index of the laser gas and thermal or mechanical disturbances in the resonator system. These requirements are thoroughly discussed in the review article by Polanyi and Tobias (1968). 3 X 10~9) for periods of up to 1 sec through stabilization of the cavity structure. 4) has been effectively used to obtain highly stabilized output frequencies from cw C0 2 lasers. Stabilization of the output from a waveguide C0 2 laser tunable over a range of 1 GHz has recently been demonstrated (Nussmeier and Abrams, 1974) using the Stark shift in an absorption line in NH 2 D.

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