Oscillators – Molecular or particle resonant type
Patent
1974-06-13
1976-03-23
Webster, Robert J.
Oscillators
Molecular or particle resonant type
331 945G, 330 43, 3132315, 3132316, H01S 3097, H01S 322
Patent
active
039463320
ABSTRACT:
A high power density continuous wave (c. w.) gas dynamic laser system is described which includes a non-equilibrium plasma jet for generating excited gaseous species having high vibrational temperature and low gas temperature. Gas flow through the plasma jet is reduced to highly turbulent subsonic flow by an expanding nozzle. Lasing in an optical cavity oriented transversely with resspect to the flow of the gaseous plasma extracts vibrational energy from the excited gaseous species as the emerge from the expansion nozzle.
The described system also includes, immediately upstream from the optical cavity, an injection system which introduces and uniformly mixes a lasing gaseous species into the highly turbulent subsonic gaseous plasma flow from the plasma jet. Gas sweeps are established in the arms of the optical cavity to cool and sweep high temperature unexcited gas species therefrom in order to reduce absorption in the optical cavity.
The described laser system can be adapted for either open cycle or closed cycle operation depending upon the gaseous mediums utilized. A particular carbon dioxide - nitrogen gas dynamic laser system is described which has a gain coefficient of 32/m at 20 torr of carbon dioxide and 40 torr of nitrogen with an estimated power density of approximately 1000 W/cm.sup.3, a saturation parameter of approximately 2000 W/cm.sup.2 and an estimated overall efficiency of approximately 24 percent..
REFERENCES:
patent: 3007072 (1961-10-01), McGinn et al.
patent: 3671883 (1972-06-01), Smars
brunet et al. AIAA Paper No. 72-725, 5th Fluid & Plasma Dynamics Conf., June, 1972, pp. 1-7.
Newhouse David E.
Webster Robert J.
White George B.
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