High power flowing gas laser with profiled electron beam excitat

Details High power flowing gas laser with profiled electron beam excitat High power flowing gas laser with profiled electron beam excitat

1974-11-07

1976-06-08

Webster, Robert J.

Oscillators

Molecular or particle resonant type

331 945G, 330 43, 313348, 313349, 313351, 313356, H01S 3097, H01S 322

Patent

active

039626563

ABSTRACT:
A high power, cw, high pressure, electrically excited flowing gas laser is disclosed wherein a laser excitation transverse to the direction of gas flow is initiated by an electron beam perpendicular to the gas flow direction. The electron beam has a cross-sectional area conforming substantially to that of the excitation region and is especially profiled to have a cross-sectional electron density which varies as a function of distance along the direction of gas flow from substantially a minimum value at the upstream and downstream extremities of the excitation region to a maximum value approximately midway along the excitation region. This profiling, which may be achieved by tapered width apertures in either an electron beam window support member or in an electron gun grid, provides an appropriate heat input to the laser gas to minimize gas density variations in the excitation region and thereby optimize the beam quality of the generated laser beam.

REFERENCES:
plummer et al., AIAA Paper No. 73-623, AIAA 6th Fluid & Plasma Dynamics Conf., July 16-18, 1973, 8 pages.
Byron, et al., Applied Physics Letters, 23 (10), 15 Nov. 73, pp. 565-567.
0'Brien, Jr., Applied Physics Letters 22 (10), 15 May 1973, pp. 503-505.

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