| 摘要 |
PURPOSE:To realize a longer life of a laser tube while eliminating increased loss by avoiding the pollution of the reflecting mirror of a light resonator due to sputtering during the discharge by a method wherein a partitioned chamber is provided at an end of the cylindrical cathode of a gas laser discharge tube, and a getter and a cathode lead pin section are prepared thereat. CONSTITUTION:A gas laser tube is composed of an open-ended capillary tube 6 extending along the center axis and a cylindrical laser tube 5 wrapping it. One opening of the capillary tube 6 at the end of the gas laser tube 5 is made larger in the inner diameter. An anode pin pierces through the tube 6 to be embedded therein and the end thereof is sealed with a reflecting mirror 9. The end of the laser tube 5 on the other opening side of the capillary tube 6 is reduced and sealed with a reflector 9 likewise. An internal projection end at the reduced section is bent so as to shape a discharging fold tube 7 so that a cell may be made between it and the tube 5. Thereafter, a cathode lead pin 2 is mounted in the cell for a cylindrical cathode 4 surrounding a getter 8 and the tube 6 through a joint 3. Thus, the getter 8 and the pin 2 possibly polluting the mirror 9 are isolated from the discharging path. |
