Electric lamp and discharge devices – Fluent material supply or flow directing means – Plasma
Patent
1976-02-02
1978-05-09
Sikes, William L.
Electric lamp and discharge devices
Fluent material supply or flow directing means
Plasma
313218, 313311, 331 945D, 331 945G, H01J 1726
Patent
active
040889661
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 respect 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%.
REFERENCES:
patent: 2826709 (1958-03-01), Von Ardenne
patent: 2858411 (1958-10-01), Gage
patent: 3007072 (1961-10-01), McGinn et al.
patent: 3946332 (1976-03-01), Samis
Chebotaev, Soviet Physics-Poklady, vol. 17, No. 9, Mar. 1973, pp. 923, 924.
Newhouse David E.
Rasco Marcus S.
Sikes William L.
White George B.
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