| 摘要 |
PURPOSE:To obtain the cold cathode gas laser tube of small size and light weight by a method wherein this tube is provided with an Al cylindrical cold cathode closely contacted with a fine tube which generates laser plasma, and with a cathode protection valve at the tip of the fine tube. CONSTITUTION:The fine tube 5 is supported by a part 1' of a casing 1 and then held in coaxial form to the casing 1. The cylindrical cathode 3' closely contacted with the outer diameter of the fine tube 5 and on the part 1' of the casing 1 is provided. Besides, the cathode protection valve 6 stretching from the tip of the fine tube 5 to the tube in coaxial form is provided. Further, mirrors 4 and 4', a cathode electrode 3, and an anode 2 are provided. Thereby, the distance from the tip 5' of the tube 5 to the surface of the cathode 3' can be kept by the valve 6, and the lifetime of the cathode 3' is prolonged. Accordingly, the gas laser tube having the small diameter of the casing 1 and a small size and a light weight can be obtained. |
