| 摘要 |
PURPOSE:To enlarge the region of working by reflecting laser light by a concave mirror and irradiating a work and thereby making the shape of luminous flux in elliptic elongated transversely and longitudinally. CONSTITUTION:Laser light projected to a concave spherical mirror 2 by an angle theta of incidence and reflected has the first focal point f1 and second focal point f2. Near the first focal point f1, the sectional form becomes slitlike form elongated transversely, and near the second focal point f2, it becomes slitlike form elongated longitudinally. Accordingly, when a work 3 is positioned near the focal point f1 or focal point f2, the shape of luminous flux of reflected laser light becomes slitlike form elongated transversely or longitudinally. Since the concave spherical mirror 2 can be cooled effectively by cooling the whole back face of the concave spherical 2 with cooling liquid, high output laser light can be used, and even if sectional area of the luminous flux is wide, working can be performed at high power density. |
