Patent ID: 7375010
Filing Date: 2008-05-20
Classification: B23K,H01L

Abstract:
1. A method of fabricating a semiconductor device, the method comprising: irradiating a beam expander with a laser beam from a laser oscillator; dividing the laser beam passed through the beam expander into at least first and second laser beams having a difference in an optical path length larger than a coherence length of the laser beam in a longitudinal direction; overlapping the first and second laser beams to homogenize the first and second laser beams at an irradiation surface of a semiconductor film; converging the first and second laser beams in a width direction of the first and second laser beams to irradiate the first and second laser beams at the irradiation surface, the first and second laser beams having a linear shape in a cross section at the irradiation surface; and crystallizing the semiconductor film by the irradiation of the converged first and second laser beams.