| 摘要 |
PURPOSE:To protect a Brewster window from contamination so as to stabilize the output of a metal ion laser of this design by a method wherein an insulating cap is provided between auxiliary anodes provided at both ends of a hollow cathode and the Brewster window, and a positive column discharge path thinner than the bore of the cathode is formed in the insulating cap. CONSTITUTION:Auxiliary anodes 6a and 6b are provided to both ends of a hollow cathode 4 provided with main anodes 5a-5c, and insulating caps 15a and 15b and insulators 7 are provided to both the ends of the hollow cathode 4. The auxiliary anodes 6a and 6b prevent metal vapor from attaching to windows 2 and 3 through the electrophoresis effect of a positive column discharge between the caps 15a and 15b and the blowing back of a negative glow discharge of the hollow cathode 4, and the diameter of a positive column discharge path 10 of the caps 15a and 15b is made almost equal to that of a negative glow region to keep an ion laser of this design vaportight to metal vapor and to protect the windows 2 and 3. By this setup, a metal ion laser of this design can be stabilized in output. |
