Patent ID: 7061017

Claim:
A laser anneal device comprising: a laser light source; an optical system for forming a line-form sheet beam from laser light emitted from the laser light source; and a mechanism for changing a relative position between a semiconductor film and the line-form sheet beam such that the line-form sheet beam scans the semiconductor film in a line width direction while the line-form sheet beam overlaps a previous scan in a predetermined amount; wherein the optical system creates a sloped energy level profile in the line-form sheet beam in a line width direction of the line-form sheet beam; and the mechanism changes the relative position between a semiconductor film and the line-form sheet beam such that a direction from a position, in the line-form sheet beam in the line width direction, in which the energy level is lower towards a position in which the energy level is higher matches a scan progress direction of the line-form sheet beam with respect to the semiconductor film.