title: Beam homogenizers based on chirped microlens arrays.
abstract: Lens array arrangements are commonly used for the homogenization of highly coherent laser beams. These fly's eye condenser configurations can be used to shape almost arbitrary input intensity distributions into a top hat. Due to the periodic structure of regular arrays the output intensity distribution is modulated by equidistant sharp intensity peaks which are disturbing the homogeneity. As a new approach we apply chirped microlens arrays to the beam shaping system. These are non-regular arrays consisting of individually shaped lenses defined by a parametric description which can be derived completely from analytical functions. The advantages of the new concept and design rules are presented.
authors: Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Str. 7, 07745 Jena, Germany. frank.wippermann@iof.fraunhofer.de
authors: Frank
authors: F
authors: Wippermann
authors: Uwe-D
authors: UD
authors: Zeitner
authors: Peter
authors: P
authors: Dannberg
authors: Andreas
authors: A
authors: Bräuer
authors: Stefan
authors: S
authors: Sinzinger