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Proceedings Paper

Precision holographic optical elements in Bayfol HX photopolymer
Author(s): Friedrich-Karl Bruder; Hyungseok Bang; Thomas Fäcke; Rainer Hagen; Dennis Hönel; Enrico Orselli; Christian Rewitz; Thomas Rölle; Dalibor Vukicevic; Günther Walze
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Paper Abstract

The versatility of Volume Holographic Optical Elements (vHOE) is high, especially because of their tunable angular and spectral Bragg selectivity. Those unique lightweight, thin and flat optical elements are enabled by the new instant developing photopolymer film Bayfol® HX technology, which allows to mass produce cost effective diffractive optics due to its simplified and robust holographic recording process. From a pure scientific point of view volume holography is well established. In practice though, commercially available optical design software is not adapted to handle the specific characteristics of photopolymer diffractive optical elements and their recording. To achieve high quality vHOE precision optics, the recording setup needs to accommodate several aspects that will be covered in this paper. We report on means how to deal with photopolymer shrinkage and average refractive index changes of the recording media. An important part in diffractive optics design is the compensation of different conditions between the holographic recording setup and in a final product containing the vHOE. Usually substrates might need to be changed (in material, in refractive index) as well the illumination sources are using incoherent light having angular and spectral emission profiles with finite bandwidth. Recently special in- and out-coupling vHOEs are becoming attractive e.g. in near eye displays and in compact lighting devices. We will report on design considerations and adjustments to the recording condition for a specific in-coupling vHOE and demonstrate the effects of pre-compensation on this example.

Paper Details

Date Published: 7 March 2016
PDF: 21 pages
Proc. SPIE 9771, Practical Holography XXX: Materials and Applications, 977103 (7 March 2016); doi: 10.1117/12.2209636
Show Author Affiliations
Friedrich-Karl Bruder, Covestro Deutschland AG (Germany)
Hyungseok Bang, LG Display Co., Ltd. (Korea, Republic of)
Thomas Fäcke, Covestro Deutschland AG (Germany)
Rainer Hagen, Covestro Deutschland AG (Germany)
Dennis Hönel, Covestro Deutschland AG (Germany)
Enrico Orselli, Covestro Deutschland AG (Germany)
Christian Rewitz, Covestro Deutschland AG (Germany)
Thomas Rölle, Covestro Deutschland AG (Germany)
Dalibor Vukicevic, Univ. de Strasbourg (France)
Günther Walze, Covestro Deutschland AG (Germany)

Published in SPIE Proceedings Vol. 9771:
Practical Holography XXX: Materials and Applications
Hans I. Bjelkhagen; V. Michael Bove Jr., Editor(s)

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