| 摘要 |
PURPOSE:To trap plasma or an electron which travels to a reflection mirror and to prevent the reflection mirror from damaging by interposing a conductive sleeve which is connected electrically between an electrode or a power source between the reflection mirror and the nearby electrode. CONSTITUTION:A carbon dioxide gas laser oscillator which has an output mirror at the left half and a total reflection mirror at the right half is provided with a conductive sleeve 17 inserted into the electrode-side opening part of a holder 11 on the side of the output mirror 8 and also with a conductive sleeve 17' inserted into the center hole of the holder 11 nearly to its overall length on the side of the total reflection mirror 8'. Further, the conductive sleeves are connected electrically to the electrode 5 through a conductive auxiliary sleeve 18 and a compression spring 19 and held at the same potential with the electrode 15 during discharging operation. Consequently, coat layers on surfaces of the mirrors 8 and 8' are held at the same potential with the electrode 15, so the acceleration of plasma and an electron is prevented between the electrode 15 and mirrors 8 and 8' and damage to the mirrors due to overheating is prevented. |
