APPARATUS FOR FORMING A HOMOGENEOUS INTENSITY DISTRIBUTION WITH BRIGHT OR DARK EDGES

摘要

A beam homogenizer (30) for transforming a beam of laser-radiation into a flat-top intensity distribution having brighter or darker edges comprises a first lens array (32), a second lens array (14), and a positive lens (16). The first lens array (32) includes a plurality of lens elements (20) that are separated by gaps (34) having no optical power. Brighter or darker edges are produced by selecting a distance between the first and second lens arrays that is less than or greater than the focal length of lens elements in the second lens array.