1975-05-29
1978-10-03
Engle, Samuel W.
G21B 100
Patent
active
041182740
ABSTRACT:
The present invention provides a system for the production of a plasma by concentrating and focusing a laser beam on the plasma-forming material with a lightfocusing member which comprises a parabolic axicon in conjunction with a coaxial conical mirror. The apex of the conical mirror faces away from the focus of the parabolic axicon such that the conical mirror serves to produce a virtual line source along the axis of the cone. Consequently, irradiation from a laser parallel to the axis toward the apex of the conical mirror will be concentrated at the focus of the parabolic axicon, impinging upon the plasma-forming material there introduced to produce a plasma. The system is adaptable to irradiation of a target pellet introduced at the focus of the parabolic axicon and offers an advantage in that the target pellet can be irradiated with a high degree of radial and spherical symmetry.
REFERENCES:
patent: 3378446 (1968-04-01), Whittlesey
patent: 3652393 (1972-03-01), Kaiser et al.
patent: 3826561 (1974-07-01), Gregg
Beam Foil-Spectroscopy, S. Bashkin, Gordon & Breach, New York (1968), pp. 146-149.
Applied Optics, vol. 13, No. 6, (5/25-27/74) Bakken pp. 1291-1292.
Cangialosi S. A.
Carlson Dean E.
Engle Samuel W.
Fisher Robert J.
Jackson Frank H.
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