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Design and fabrication of polarization-holographic elements for laser beam shaping

: Fratz, M.; Sinzinger, S.; Giel, D.

Preprint urn:nbn:de:0011-n-941874 (668 KByte PDF)
MD5 Fingerprint: 053fbca693d6f2e8ad48e9ba6d68370d
Erstellt am: 20.5.2009

Applied optics 48 (2009), Nr.14, S.2669-2677
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IPM ()
diffractive optics; computer holography; microstructure fabrication; PHOE

We report on an experimental realization of polarization-holographic optical elements (PHOEs) for laser beam shaping. The PHOEs were written into an azobenzene polymer layer by illumination with linearly polarized, focused light with spatially varying orientation. We propose a noniterative design method for the calculation of PHOEs that transform laser beams into arbitrary rotationally symmetric or separable intensity distributions such as flattop or ring profiles. The experimentally observed intensity distributions are compared with those predicted by numerical simulations based on the Fresnel diffraction approximation. Diffraction efficiencies up to 79% were determined experimentally.