Multi-stage optical homogenization

摘要

Substrate processing equipment and methods are used to improve the uniformity of illumination across an illuminated portion of a substrate by processing light with multiple optical homogenizers. The multiple optical homogenizers each include micro-lens arrays (310, 312, 320, 322) and Fourier lens (314, 324). The multiple optical homogenizers are arranged so that the output numerical aperture of one of the optical homogenizers is within 5% of the input numerical aperture of another optical homogenizer.