| 摘要 |
PURPOSE:To adjust current density in a main discharge section, and to enable processing free of nonuniformity on processing by forming a difference in the depth of grooves so that the center is most deepened in the depth of a plurality of the grooves notched on one electrode-facing surface side of main discharge electrodes. CONSTITUTION:Seven grooves 15a-16g, a transverse shape of which shows an approximately V shape and which are formed shallow approximately proportionally toward both sides while making the groove 16d at the center deepest, are notched at constant pitches to the oppositely faced surface of a cathode 2 opposite faced to an anode 3 in the atmosphere of a gas laser medium. Spare discharge electrodes 8 having structure in which cores 7 are inserted into glass pipes 6 are buried to these grooves 15a-16g, and the cores 7 of the electrode 8 at both ends in the electrodes 8 are positioned at the same positions as the surface of the cathode 2. |
