Accession Number : ADD007186

Title :   Method and Apparatus for Injecting Gas into a Laser Cavity.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Avidor,Joel M ; Knight,Charles J

Report Date : 01 Apr 1980

Pagination or Media Count : 8

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. (Author)

Descriptors :   *Patents, *Laser cavities, Laser gases, Injection, Electric discharges, Output, Power levels

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE