| 摘要 |
PURPOSE:To enable irradiation of energy at a uniform density to a material to be worked by refracting a laser beam in plural directions, condensing the laser beams superposed with the part of the high energy density and the part of the low energy density and irradiating such beam to the work. CONSTITUTION:A laser beam 1 having a Gauss type energy density distribution is irradiated to a prism 4 of a conical body having a gable roof shape in such a way that the central part of the beam 1 coincides with the ridgeline of the prism 4. The laser beams 5, 6 subjected to refraction by the prism 4 are superposed to obtain a laser beam having the approximately uniform energy density distribution. The laser beam consisting of the beams 5, 6 is then condensed by a convex lens 2 and is irradiated to a material 3 to be worked. The material 3 is worked at a desired working pattern by changing a work distance l. The irradiation of the laser beam at the uniform energy density to the material to be worked is thus made possible. |
