Patent ID: 6437284
Filing Date: 2002-08-20
Classification: B23K,H01L

Abstract:
An optical system for laser beam heat-treating of a film on a substrate by irradiating the film with a laser beam, comprising:a single intensity distribution forming means for regulating light intensity distribution in a cross section of a laser beam emitted by a laser oscillator; and beam shape forming means for forming a rectangular beam shape on the film on the substrate, wherein the single intensity distribution forming means generates a uniform intensity distribution of the laser beam in a y direction of the beam cross section, perpendicular to an optical axis of the laser beam, while maintaining in an x direction, perpendicular to the y direction, in the beam cross section an intensity distribution and directivity of the laser beam substantially identical to the laser beam as emitted from the laser oscillator; and the beam shape forming means changes a dimension of the laser beam received from the intensity distribution forming means in at least one of the x direction and the y direction to form a rectangular beam shape that is smaller in the x direction than in the y direction on the film surface.