Laser beam tube with helical gas flow for reducing thermal bloom

Details Laser beam tube with helical gas flow for reducing thermal bloom Laser beam tube with helical gas flow for reducing thermal bloom

1979-11-26

1982-10-26

Sikes, William L.

Coherent light generators

Particular active media

Gas

H01S 303

Patent

active

043565654

ABSTRACT:
A laser beam flow tube arrangement is disclosed in which the Ranque-Hilsch effect is advantageously utilized to reduce thermal blooming in a laser beam. The arrangement includes a tubular member through which the laser beam is propagated longitudinally and a vortical flow generator in gas flow communication with the interior of the tubular member. The flow generator produces vortical flow of a gas having low absorption properties at the wavelength of the laser beam and introduces the vortically flowing gas into the tubular member. The gas flows along a helical path within the tubular member with a tangential velocity selected to provide a negative temperature gradient between the wall and axis of the tubular member which is substantially equal in magnitude to the positive temperature gradient therebetween due to the thermal blooming.

REFERENCES:
patent: 3449615 (1969-06-01), Tucker et al.
"Performance Study of a Vortex-Stabilized Arc Radiation Source" by Anderson et al.; Appl. Optics, vol. 4, No. 11, Nov. 1965, p. 1435.
"Vortex Discharge as a Pumping Source for Continuous Wave Lasers", Zhitkova et al., Soc. Jour. Quant. Elect., vol. 1, No. 3, Nov-Dec. 1971.
"Vortex Stabilized Flashlamps for Dye Laser Pumping"by M. E. Mack, Appl. Optics, vol. 13, No. 1, Jan. 1974.

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