Patent ID: 7714251

Claim:
A laser irradiation apparatus comprising: a laser oscillator; an optical system shaping laser light produced by the laser oscillator; a blower having an opening for supplying a gas; a stage provided below the blower; a supporting mechanism maintaining a constant distance between the blower and the stage; and a unit provided between the optical system and the blower for observing the laser light transmitted through the optical system, wherein the unit includes a CCD camera, wherein the optical system includes a lens, wherein the unit is capable of checking shape of the laser light so that a distance between the lens in which laser light lastly passes through and the CCD camera is substantially the same as a distance between a substrate to be irradiated with the laser light and the lens, wherein the unit is capable of moving between a first position and a second position, wherein the unit overlaps with the optical system and the stage in the first position, wherein the unit does not overlap with the optical system in the second position, and wherein the unit checks energy and shape of the laser light.