| 摘要 |
PURPOSE:To obtain a laser oscillator wherein the diameter of an aperture can be adjusted easily to the diameter of laser beams by arranging the constitution such that the aperture is provided freely in shifting to the light axis direction of the laser beams inside a rear mirror. CONSTITUTION:A laser oscillator 1 is equipped with a resonator 3, an output mirror 5a and a rear mirror being provided on both sides of it, and others, and then an aperture inside the rear mirror 7 is provided. And when a servo motor 29 is driven, a gear 27 is rotated through an output shaft, and a ball screw is rotated through a gear 35, and the aperture 17 is shifted to the light axis direction of laser beams LB through a nut member 19, however a beam waist exists in the laser beam LB oscillated between the output mirror and the rear mirror 7, and the diameter 2W0 is smallest at the beam west part, and is largest near the output mirror 5 and the rear mirror 7, therefore by shifting the aperture 17 in the light axis direction of the laser beam LB, it has the same effect as having changed the diameter of the aperture 17. As a result, the diameter of the laser beams can be adjusted simply and easily. |
