Thoriated-tungsten, split-ring, hollow-cathode electrode for dis

Coherent light generators – Particular pumping means – Electrical

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372 61, 372 88, H01S 3097

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active

053512600

ABSTRACT:
An electrode assembly for a gas or metal vapor discharge device is disclosed. A pair of electrode assemblies each comprising thoriated tungsten with an alloy composition of tungsten (W) and from about 2% to about 3% of thorium dioxide ThO2 are located at opposite ends of the discharge chamber of the discharge device. The tip of the electrode preferably has four slots equally spaced around its circumference and a groove at its outermost edge. The tip of the electrode provides mechanical flexibility that inhibits the cracking of the thoriated tungsten electrode when it is mounted in the discharge device. Each electrode assembly further comprises a copper spacer, preferably I-shaped in cross-section, brazed against the base of the electrode and against a vacuum flange. The pair of electrode assemblies confines the discharge of the discharge device between the tips of the electrodes and inhibits the arc condition from finding its way to delicate vacuum seals. The electrode assembly provides a clear optical aperture to allow light or laser radiation to exit the discharge cell.

REFERENCES:
patent: 3946332 (1976-03-01), Samis
patent: 4088966 (1978-05-01), Samis
patent: 4696011 (1987-09-01), Kearsley
patent: 4794614 (1988-12-01), Maitland et al.
patent: 4955033 (1990-09-01), Maitland et al.
patent: 4956845 (1990-09-01), Otto et al.
A Request for Quotation No. N62269-88-Q-3120 to build a prototype of the ention for experimentation was issued Feb. 24, 1988 and sent to 6 potential bidders and culminated in a Purchase Order No. N62269-89-M-3124 issued May 23, 1989.

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