Patent ID: 6697096
Filing Date: 2004-02-24
Classification: G03F

Abstract:
A laser beam pattern generator comprising:a substrate support capable of supporting a substrate, the substrate support comprising a support motor; a laser beam source to generate a laser beam; a beam modulator to modulate the intensity of the laser beam according to a pattern; a rotating scanner comprising a plurality of mirror facets capable of rotating at a spinning frequency to scan the laser beam across the substrate; a rotating scanner compensator to deflect the laser beam according to a rotating scanner correction signal comprising a summation of a plurality of predetermined harmonics of the spinning frequency to compensate for errors in the scanning of the laser beam arising from the rotating scanner; and a controller comprising program code to control the substrate support, laser beam source, beam modulator, rotating scanner, and rotating scanner compensator, to modulate and scan the laser beam across the substrate to generate the pattern on the substrate, whereby a corrected laser beam pattern is generated on the substrate.