PURPOSE: To obtain a high-output laser device of small size and low price by decreasing a discharge starting voltage by forming a plane on a downstream side of a gas of a split electrode of a cathode into a concave form and arranging a needle-like projection at the front end.
CONSTITUTION: Plural split electrodes 7 which are to be a cathode of a discharge-type gas laser device are arranged with intervals on an insulator 4 oppositely to an anode 2. The split electrode 7 is composed of a shaft part 8 to which a ballast resistor 3 is connected and an electrode part 9 formed of a bending plate provided with a projection 10 formed on the lower end. The convex plane 11 of bend of said plate confronts a flow of a discharge gas 6. A cathode plane on a downstream side of the gas is made concave 12 thereby enlarging an area of a stable negative glow region and stabilizing a discharge. A corona discharge is caused from the projection 10 at the front end of the cathode electrode and accordingly the starting voltage of the laser glow discharge is decreased.
SUZUKI SETSUO
MORIMIYA OSAMU
