| 摘要 |
PURPOSE:To lengthen a service life of ion laser tube by eliminating the deterioration of cathode and the plasma sputter in a gas laser oscillator. CONSTITUTION:The magnetic boundary of cathode end face 7 generating from a plasma focussing electromagnet is set to 100 gauss and a line of magnetic flux 8 passing through the cathode end face is arranged so as to become smaller than the radius of capillary 10 on a capillary end face 9, and further the electrons emitted from the cathode are focussed sufficiently and enter a capillary section 4. Therefore, such construction can prevent the deterioration of cathode and eliminate the plasma sputtering in the capillary end. |
