Magnetron cathodes in plasma electrode pockels cells

Details Magnetron cathodes in plasma electrode pockels cells Magnetron cathodes in plasma electrode pockels cells

1993-05-10

1995-04-25

Yoo, Do Hyun

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359257, G02F 103

Patent

active

054104254

ABSTRACT:
Magnetron cathodes, which produce high current discharges, form greatly improved plasma electrodes on each side of an electro-optic crystal. The plasma electrode has a low pressure gas region on both sides of the crystal. When the gas is ionized, e.g., by a glow discharge in the low pressure gas, the plasma formed is a good conductor. The gas electrode acts as a highly uniform conducting electrode. Since the plasma is transparent to a high energy laser beam passing through the crystal, the plasma is transparent. A crystal exposed from two sides to such a plasma can be charged up uniformly to any desired voltage. A typical configuration utilizes helium at 50 millitorr operating. pressure and 2 kA discharge current. The magnetron cathode produces a more uniform plasma and allows a reduced operating pressure which leads to lower plasma resistivity and a more uniform charge on the crystal.

REFERENCES:
patent: 3639771 (1972-02-01), Borrelli
patent: 4013532 (1977-03-01), Cormia
patent: 4615588 (1986-10-01), Goldhar et al.
patent: 5021139 (1991-06-01), Hartig
patent: 5045166 (1991-09-01), Bobbio

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