Coherent light generators – Particular active media – Gas
Patent
1991-01-15
1992-05-26
Epps, Georgia Y.
Coherent light generators
Particular active media
Gas
372 61, 372 55, 372 35, 372 34, 372 85, 372 90, H01S 322
Patent
active
051174340
ABSTRACT:
A metal vapor laser has a discharge tube with electrodes at opposite ends. A power source is electronically connected to the electrodes and generates a discharge in a discharge region within the discharge tube. The discharge generates laser light which emerges from the tube via windows. In order to cool the apparatus, the discharge tube is surrounded by a cooling jacket in the form of a hollow cooling vessel. A liquid flows in the cooling vessel and removes heat. The space between the cooling vessel and the discharge tube is evacuated. The cooling vessel is conductive and, since it is connected between one of the electrodes and the power supply, its inner and outer walls provide two potential paths for return current. The fact that the inner and outer walls have different diameters means that the inductance of the return paths is large. Therefore, the outer wall has a gap in it filled with insulating material. This forms a break in the conductive path from the electrode to the power source through the outer wall, and so reduces the inductance of the return path. Other geometries are also possible in which all but the innermost path are broken by insulating material.
REFERENCES:
patent: 4247830 (1981-01-01), Karras et al.
patent: 4442523 (1984-04-01), Bricks
patent: 4815091 (1989-03-01), Hara et al.
"Large Scale Copper Vapor Laser Computer Control Systems", M. J. LaChapell et al., ISA Annual Conference, 1979, pp. 61-71.
Kichikawa Toshimichi
Oohashi Tuneyoshi
Shirakura Toshiharu
Sugawara Hiroyuki
Wada Akira
Epps Georgia Y.
Hitachi , Ltd.
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