Selenia Industrie Elettroniche Associate S.p.a.

Ugo Perito

Eugenio Penco

Renato Marchetti

A pair of excitation electrodes in a laser cavity, filled with a gas mixture at substantially atmospheric pressure, are connected across a pumping capacitor by way of part of the winding of an autotransformer in series with a pre-ionizing device within the cavity acting as a trigger switch. The pre-ionizing device comprises a dielectric tube carrying a plurality of axially spaced-apart metal rings constituting a condenser chain, the rings being provided with pointed extensions confronting one another to serve as corona electrodes. Contral pulses applied to a conductor inside the tube cause a spark discharge through the cascaded corona gaps of the trigger switch with resulting energization of the autotransformer and discharge of the pumping capacitor across the excitation electrodes. The metal rings may be interconnected by high-ohmic resistors establishing a uniform field distribution therebetween.

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Rome, Italy

Ugo Perito