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Proceedings Paper

Diffractive optics in large sizes: computer-generated holograms (CGH) based on Bayfol HX photopolymer
Author(s): Friedrich-Karl Bruder; Thomas Fäcke; Rainer Hagen; Dennis Hönel; Tim Patrick Kleinschmidt; Enrico Orselli; Christian Rewitz; Thomas Rölle; Günther Walze
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Paper Abstract

Volume Holographic Optical Elements (vHOE) offer angular and spectral Bragg selectivity that can be tuned by film thickness and holographic recording conditions. With the option to integrate complex optical function in a very thin plastic layer formerly heavy refractive optics can be made thin and lightweight especially for large area applications like liquid crystal displays, projection screens or photovoltaic. Additionally their Bragg selectivity enables the integration of several completely separated optical functions in the same film. The new instant developing photopolymer film (Bayfol® HX) paves the way towards new cost effective diffractive large optics, due to its easy holographic recording and environmental stability.

A major bottleneck for large area applications has been the master hologram recording which traditionally needs expensive, large high precision optical equipment and high power laser with long coherence length. Further the recording setup needs to be rearranged for a change in optical design.

In this paper we describe an alternative method for large area holographic master recording, using standard optics and low power lasers in combination with an x, y-translation stage. In this setup small sub-holograms generated by a phase only spatial light modulator (SLM) are recorded next to each other to generate a large size vHOE. The setup is flexible to generate various types of HOEs without the need of a change in the mechanical and optical construction by convenient SLM programming. One Application example and parameter studies for printed vHOEs based on Bayfol® HX Photopolymer will be given.

Paper Details

Date Published: 11 March 2015
PDF: 14 pages
Proc. SPIE 9385, Advances in Display Technologies V, 93850C (11 March 2015); doi: 10.1117/12.2077139
Show Author Affiliations
Friedrich-Karl Bruder, Bayer MaterialScience AG (Germany)
Thomas Fäcke, Bayer MaterialScience AG (Germany)
Rainer Hagen, Bayer MaterialScience AG (Germany)
Dennis Hönel, Bayer MaterialScience AG (Germany)
Tim Patrick Kleinschmidt, Bayer MaterialScience AG (Germany)
Enrico Orselli, Bayer MaterialScience AG (Germany)
Christian Rewitz, Bayer MaterialScience AG (Germany)
Thomas Rölle, Bayer MaterialScience AG (Germany)
Günther Walze, Bayer MaterialScience AG (Germany)

Published in SPIE Proceedings Vol. 9385:
Advances in Display Technologies V
Liang-Chy Chien; Sin-Doo Lee; Ming Hsien Wu, Editor(s)

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