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Proceedings Paper

Design and fabrication of refractive and diffractive micro optical elements used in holographic recording setups
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Paper Abstract

The uniform illumination of holographic screens during their recording process is commonly realized by using only the quasi-constant, inner part of the gaussian intensity profile of a very strongly expanded laser beam. This technique is characterized by a very low efficiency (about 5%, depending on the required uniformity). We present a method, which uses refractive, micro optical beamshaping elements in order to create a rectangular, extraordinarily uniform, flat-top intensity profile with minimal phase aberrations. This allows the use of about 80%-90% of the provided optical power for the illumination of the holographic screen. To ensure the required quality of the illumination wave, a spatial frequency filtering has to be applied. For certain holographic applications, requiring a combination of high beam-divergence and high optical power, conventional pinholes are either too thin or too sensitive. To solve this problem, we present a new concept of dielectric pinholes, based on optical microstructures. The combination of beamshaping elements and dielectric pinholes allowed us to extend the available parameter range during the recording of holograms.

Paper Details

Date Published: 20 October 2005
PDF: 12 pages
Proc. SPIE 5965, Optical Fabrication, Testing, and Metrology II, 596503 (20 October 2005); doi: 10.1117/12.625195
Show Author Affiliations
T. Kaempfe, Friedrich-Schiller-Univ. Jena (Germany)
E.-B. Kley, Friedrich-Schiller-Univ. Jena (Germany)
A. Tuennermann, Friedrich-Schiller-Univ. Jena (Germany)

Published in SPIE Proceedings Vol. 5965:
Optical Fabrication, Testing, and Metrology II
Angela Duparré; Roland Geyl; Lingli Wang, Editor(s)

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