Patent ID: 9188874
Filing Date: 2015-11-17
Classification: G01B,G01N,G02B,G03F

Abstract:
1. A spot-array imaging system comprising a projection lens and an aberration corrector, wherein: the system is configured to simultaneously convey each of a plurality of optical radiation beams to an image surface, and to focus each beam to a diffraction-limited focus spot at a corresponding image point on the image surface; the aberration corrector comprises a phase-modifying optical surface or plurality of phase-modifying optical surfaces, and is disposed in a position where the beams are substantially non-overlapping and not in focus; and each beam traverses a portion of the aberration corrector, which is configured to compensate for any point-imaging optical aberrations of the projection lens so that the aberration corrector and the projection lens in combination achieve substantially aberration-free point focusing of each beam at its corresponding image point.