Patent ID: 6353218
Filing Date: 2002-03-05
Classification: B23K,G02B,H01L

Abstract:
A laser illumination apparatus which illuminates a semiconductor film with a linear laser beam while scanning the semiconductor film with the linear laser beam, comprising:a pulsed laser light source; an optical system for generating a linear laser beam having a beam width W by dividing a pulse laser beam that is emitted from the pulsed laser light source into a plurality of beams vertically and horizontally and combining divisional beams after they have been processed into a linear shape individually; and means for moving a substrate that is mounted with the semiconductor film, wherein a condition W/20&lE;&Dgr;(r)&lE;x&lE;W/5 is satisfied, where r is a height difference of a surface of the semiconductor film, &Dgr;(r) is a variation amount of the beam width W as a function of the height difference r, and x is a movement distance of the substrate during an oscillation period of the pulsed laser light source.