Pressure-wave cycled, repetitively pulsed gas laser

Coherent light generators – Particular active media – Gas

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372 92, 372 89, 372 90, 372 84, H01S 322

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active

045984069

ABSTRACT:
A pressure-wave cycled, repetitively pulsed gas laser comprises a laser cavity having open first and second ends, a channel connecting the first and second sides of laser cavity and a lasing initiation mechanism including two electric discharge electrodes. The electrode discharge generates a shockwave and associated pressure ridge. The channel may be a conicoidical channel of which the first and second open sides of the laser cavity form, respectively, large and small entrances for the shock wave and pressure ridge whereby when the wavefronts meet in the channel the energy thereof cancels in proportion to the entry areas and the resultant wave proceeds to the small entrance where it is accelerated by the nozzle action of the small entrance, entrains non-disassociated gases and circulates the gases through the laser cavity. In a second embodiment the channel circumscribes the open sided laser cavity and includes a reflector at the upstream side and a disperser at the downstream side whereby the shock wave and pressure ridge of the laser cavity is reflected through the laser cavity to the disperser which sends the wave through the channel thereby preventing it from reentering the laser cavity at the downstream end. A third embodiment utilizes an asymmetrical chamber with sides which reflect the pressure wave in a circular manner about the center of the discharge region, thus eliminating the channel.

REFERENCES:
patent: 3898584 (1975-08-01), Born
patent: 4360922 (1982-11-01), Kulkarny
Srivastava et al; "Acoustic Suppression in a Pulsed Laser System" AIAA Jour. vol. 18, No. 5, May 1980.
Srivastava; "Pressure Wave Attenuation Due to Anode Mufflers in Pulsed Lasers"; AIAA Jour. vol. 21, No. 3, Mar. 1983.
Ausherman et al; "Acoustic Suppession in a Pulsed Chemical Laser"; AIAA Jour. vol. 17, No. 5, May 1979.

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