Method and apparatus for injecting gas into a laser cavity

Details Method and apparatus for injecting gas into a laser cavity Method and apparatus for injecting gas into a laser cavity

1978-04-17

1980-04-01

Davie, James W.

Oscillators

Molecular or particle resonant type

331 945D, H01S 300

Patent

active

041964012

ABSTRACT:
Laser gas injected into a multiple-pulsed electric discharge laser (EDL) must be removed as quickly as possible following each laser pulse. This `clearing time` can limit the average laser output power. Fast, efficient mass transport is needed and it, in turn, requires the establishment of a uniform velocity flowfield. Such a uniform flowfield can be established by injecting the laser gas through arrays of porous tubes formed with eccentric walls tailored in wall thickness to introduce a non-uniform injection velocity around the circumference of each tube. Preferably, the tubes have a cross-sectional shape formed of displaced circular inner and outer contours to provide a progressively thickening wall. Tailoring is designed to establish an optimum, non-uniform injection velocity distribution capable of producing a nearly irrotational flow that rapidly develops into a uniform flowfield downstream of the tube array. Because of the enhanced heat transfer characteristics of the porous tubes, a beneficially uniform gas temperature also is maintained to assure good optical medium homogeneity.

REFERENCES:
patent: 3842363 (1974-10-01), Dobrzelecki et al.
patent: 4011522 (1977-03-01), Falk
patent: 4021753 (1977-05-01), Braunschweig
patent: 4091133 (1978-05-01), Papayoanou
J. M. Avidor et al., "Experimental and Theoretical Investigation of Flow erated by an Array of Porous Tubes", AIAA Journal, vol. 14, No. 11, Nov. 1976, pp. 1534-1540.

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