Preionizing arrangement for transversely excited lasers

Details Preionizing arrangement for transversely excited lasers Preionizing arrangement for transversely excited lasers

H - Electricity

01

S

345/38

H01S 3/03 (2006.01) H01S 3/038 (2006.01) H01S 3/0971 (2006.01)

Patent

CA 1187971

ABSTRACT OF THE DISCLOSURE The present invention provides the improvement, in transversely excited gas lasers having a laser discharge channel and a pair of opposed main discharge electrodes longitudinally disposed in the channel in transversely spaced relation, comprising preionizing electrodes in the channel for producing at least one longitudinally extending, filamentary discharge upon passage of a predetermined electrical current therethrough, the preionizing electrodes being formed of a semiconductive material characterized by a relatively high impedance at relatively low voltages and a rapidly decreasing impedance at increasing voltages beyond a breakdown voltage such that upon application of a high energy, high voltage pulse to the main electrodes and the preionizing electrodes, the electrical impedance of the preionizing electrodes drops below the impedance of lasing material in the channel whereby electrical current initially flows between the preionizing electrodes and produces the longitudinal, filamentary discharge.

400828

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