| 摘要 |
PURPOSE:To form a satisfactory temp. distribution to a work and to improve working efficiency by compressing laser light of an annular mode in one direction to form a flat spot and irradiating such light to the work. CONSTITUTION:Laser light 1 of an annular mode oscillated by a laser oscillator 2 is condensed to a spot 4 of a slender shape by a cylindrical lens 3 having a semi-circular cylindrical shape so that the energy distribution thereof is made into a saddle shape having a peak on the outside. When such spot 4 is irradiated to a work 5, the surface temp. distribution of the work 5 has a trapezoidal shape indicating a uniform temp. distribution on account of thermal diffusion outside the irradiating area of the work 5, thereby expanding the max. tem. width. A stable heat treatment is thus accomplished. |
