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Proceedings Paper

Stochastic tandem microlens arrays for beam homogenization
Author(s): Frank C. Wippermann; Daniela Radtke; Peter Dannberg; Uwe D. Zeitner; Andreas Bräuer
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Paper Abstract

Fly's eye condensers are commonly used for the beam shaping of an arbitrary input intensity distribution into a top hat. The setup usually consists of a Fourier lens and two identical regular microlens arrays - often referred to as tandem lens array - where the second one is placed in the focal plane of the first microlenses. As a consequence of the periodic structure of the regular arrays, the output intensity distribution is modulated by equidistantly located sharp intensity peaks. We propose a new concept for fly's eye condensers incorporating a stochastic tandem microlens array for the generation of an intensity far field distribution with improved homogenization under coherent illumination with the envelope of a top hat. The influences of the variance of the lens parameters and the number of illuminated lenses on the homogenization results are discussed. Measurements obtained at first prototypes fabricated by laser lithography and a subsequent UV-replication are presented.

Paper Details

Date Published: 12 September 2008
PDF: 11 pages
Proc. SPIE 7062, Laser Beam Shaping IX, 70620Q (12 September 2008); doi: 10.1117/12.793239
Show Author Affiliations
Frank C. Wippermann, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Daniela Radtke, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Peter Dannberg, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Uwe D. Zeitner, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Andreas Bräuer, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)


Published in SPIE Proceedings Vol. 7062:
Laser Beam Shaping IX
Andrew Forbes; Todd E. Lizotte, Editor(s)

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