| 摘要 |
PURPOSE:To enable to heat uniformly a material to be heated by a method wherein a laser beam whose strength distribution in the sectional area of beam has a smooth trapezoidal form or resembled to it is applied to a part to be irradiated of the material to be heated. CONSTITUTION:An output of a laser oscillator 1 operating in the multitransverse mode is fed to an optical fiber 3 through a condenser 2, and the beam receives a higher mode change during the passing in the fiber 3. The strength distribution in the sectional area of beam at the irradiating out end is a smooth distribution having a trapezoidal form or resembled to it being fixed by the distribution of a refractive index in the fiber. Therefore by applying the beam to the part to be irradiated of a material 4 to be heated, the material 4 can be heated uniformly. |
