Patent ID: 6897940

Claim:
A system for correcting aberration and distortion in EUV lithography, said system comprising: a deformable reticle chuck that has a reticle placed thereon; a reticle height sensor that measures a height of the reticle placed on said deformable reticle chuck; an optical system that has an exit pupil, projects EUV radiation onto the reticle placed on said reticle chuck and leads reflected EUV radiation from said reticle through said exit pupil onto a wafer placed on a wafer chuck; said optical system including a deformable mirror proximal to said exit pupil; wherein said deformable reticle chuck and said deformable mirror are controlled such that aberration and distortion of an image of said reticle formed on said wafer by said optical system are corrected based on the height measured by said reticle height sensor.