Coaxial type laser oscillator for excitation by silent discharge

Claim 1

A coaxial silent discharge type laser device comprising: (a) a discharge tube made of an insulating material; (b) a laser medium gas flowing from one end to the other end of said discharge tube; (c) a laser oscillator constructed with a partial reflection mirror and a total reflection mirror, said reflection mirrors being disposed at both ends of said discharge tube in a mutually opposed relationship; (d) at least a pair of ring-shaped electrodes disposed on and around the outer peripheral surface of said discharge tube with a predetermined space interval being provided between them, said discharge tube at a position underneath said electrodes being made of a dielectric material of a high dielectric constant different from said insulating material which allows the electric current for said silent discharge to be increased thereby producing a larger laser output; and (e) an a.c. power source to supply alternating current voltage to said pair of electrodes.