RF excited laser with internally folded resonator

Coherent light generators – Particular pumping means – Electrical

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372 38, 372 61, 372 87, 372 93, H01S 3097, H01S 300

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active

048918199

ABSTRACT:
A transversely RF excited gas laser with an internally folded resonator includes an elongated chamber of cross-sectional dimensions suitable for confining a laser gas discharge, a plurality of reflectors and a laser gas. The reflectors form a stable folded laser resonator cavity of a compact geometry in order to efficiently extract laser power from the laser resonator cavity. There are at least two of the reflectors and at least one of the plurality of reflectors is concave. The laser gas is disposed in the folded resonator cavity which reflect and guide light energy from the laser gas discharge within the elongated chamber. The transversely RF excited gas laser with an internally folded resonator also includes a pair of electrodes and a pair of cooling electrodes. The electrodes are transversely disposed on the elongated chamber and excite the laser gas. The cooling electrodes are transversely disposed on the elongated chamber and electrically coupled to ground. The impedance-matching circuit applies RF power to the electrodes. The impedance-matching circuit includes three inductors with a center-tapped coil being adjusted so that the voltage potential at the center of the laser discharge between the pair of cooling electrodes is a virtual ground thereby preventing RF current from passing through the grounded cooling electrodes in order to efficiently extract laser power from the laser resonator cavity.

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patent: 4679201 (1987-07-01), Klingel
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patent: 4740986 (1988-04-01), Reeder

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