| 摘要 |
PURPOSE:To improve the performance of an AC discharge type laser remarkably by selecting the ratio of the width of spiral electrodes to the shortest distance between the electrodes and the number of spiral windings within a predetermined range. CONSTITUTION:Spiral electrodes 2, 3 are mounted on the outer wall of a discharge tube 4 for a dielectric cylinder in the manner of a conventional method. When an output from an AC power supply 1 having frequency (f) is applied between the electrodes 2, 3, AC discharge 9 is generated, and a laser medium 8 in the tube 4 is excited. Consequently, laser oscillations are generated between a resonator by a total reflection mirror 5 and a partial reflection mirror 6, and one part is discharged from the mirror 6. When the ratio of electrode width W to the shortest distance between the electrodes is brought to 0.2-l.5 and the number of turns of the electrodes is selected at 0.5-3 times, the dielectric breakdown of the discharge tube and dielectric break-down between the electrodes on the outer wall surface of the discharge tube are not generated, and large power can be applied, thus acquiring large-output laser beams with an excellent symmetry. |
