Patent ID: 7655881
Filing Date: 2010-02-02
Classification: B23K,G02B,H01L,H01S

Abstract:
1. A laser irradiation apparatus comprising: a laser oscillator; a first means for expanding a laser beam emitted from the laser oscillator in a first direction; a second means for condensing the laser beam in a second direction that is orthogonal to the first direction; and a third means for moving a laser beam irradiation surface in the second direction, relative to the laser beam expanded in the first direction and condensed in the second direction, over which an object to be irradiated having the laser beam irradiation surface is provided, wherein the laser beam irradiation surface has a cylindrical shape curvature in a negative direction with respect to a direction in which the laser beam advances and in a direction parallel to the first direction, wherein an aggregation of focus positions of the laser beam passing through the first means and the second means has the cylindrical shape curvature in the negative direction with respect to the direction in which the laser beam advances and in the direction parallel to the first direction, and wherein the laser beam irradiation surface has a side length on the order of 1 m.