| 摘要 |
PURPOSE:To make it possible to perform highly accurate laser cutting machining, by providing fine adjusting means of the incident angle of laser light, which is inputted on a retarder, thereby obtaining 100% circularly polarized light without deviating the optical axis of the laser light. CONSTITUTION:By manipulating a micrometer 13, the fine adjustment of the rotation of a mirror holding block 4b is performed with a supporting point 10 as a center. Thus the incident angle of laser light 1 on a retarder 3 can be adjusted. The fine adjustment of the rotation of a rotary block 5 with respect to the Z-axis is performed at the same time. Thus, 100% circularly polarized laser light is obtained. At this time, the reflecting surfaces of the retarder 3 and a reflecting mirror holding block 4b. Therefore, based on the principle of two mirrors, the optical axis of the laser light is not deviated even if the mirror holding block 4b is rotated with the supporting point 10 as the center. Thus, the optical axis of the laser light, which is reflected by a reflecting mirror 2c is always located on the Z-axis. |
