PURPOSE:To freely alter and control a laser output by a simple operation by providing electrode drive means for driving one or both of main electrodes in a discharge direction, and control means for controlling the operation amount of the drive means. CONSTITUTION:A rack is formed at the engaging part of an anode 3, a gear 12 is mounted as electrode drive means for driving the anode 3 in a discharge direction by engaging with the rack in the recess of a support plate 5, and controlled by a control signal from control means separately provided. Accordingly, the gear 12 is rotated to alter a distance between the main electrodes 2 and 3. Accordingly, when a laser output is reduced after the discharge is repeated many times, an interval between the electrodes 2 and 3 is increased to improve a discharge starting voltage, energy stored in a peaking capacitor 7 is increased to increase energy to be injected into the electrodes 2, 3 at the time of generating a glow discharge. Thus, the output of a laser radiation can be increased as required. The interval between the electrodes 2 and 3 is narrowed according to the use of the laser radiation to freely reduce, on the contrary, the output of the laser radiation.
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