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Proceedings Paper

Mass production of volume holographic optical elements (vHOEs) using Bayfol(R) HX photopolymer film in a roll-to-roll copy process
Author(s): Friedrich-Karl Bruder; Thomas Fäcke; Fabian Grote; Rainer Hagen; Dennis Hönel; Eberhard Koch; Christian Rewitz; Günther Walze; Brita Wewer
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Paper Abstract

Volume Holographic Optical Elements (vHOEs) gained wide attention as optical combiners for the use in augmented and virtual reality (AR and VR, respectively) consumer electronics and automotive head-up display applications. The unique characteristics of these diffractive grating structures – being lightweight, thin and flat – make them perfectly suitable for use in integrated optical components like spectacle lenses and car windshields. While being transparent in Off-Bragg condition, they provide full color capability and adjustable diffraction efficiency. The instant developing photopolymer Bayfol® HX film provides an ideal technology platform to optimize the performance of vHOEs in a wide range of applications. Important for any commercialization are simple and robust mass production schemes. In this paper, we present an efficient and easy to control one-beam recording scheme to copy a so-called master vHOE in a step-and-repeat process. In this contact-copy scheme, Bayfol® HX film is laminated to a master stack before being exposed by a scanning laser line. Subsequently, the film is delaminated in a controlled fashion and bleached. We explain working principles of the one-beam copy concept and discuss the mechanical construction of the installed vHOE replication line. Moreover, we treat aspects like master design, effects of vibration and suppression of noise gratings. Furthermore, digital vHOEs are introduced as master holograms. They enable new ways of optical design and paths to large scale vHOEs.

Paper Details

Date Published: 6 April 2017
PDF: 20 pages
Proc. SPIE 10127, Practical Holography XXXI: Materials and Applications, 101270A (6 April 2017); doi: 10.1117/12.2250933
Show Author Affiliations
Friedrich-Karl Bruder, Covestro AG (Germany)
Thomas Fäcke, Covestro AG (Germany)
Fabian Grote, Covestro AG (Germany)
Rainer Hagen, Covestro AG (Germany)
Dennis Hönel, Covestro AG (Germany)
Eberhard Koch, Covestro AG (Germany)
Christian Rewitz, Covestro AG (Germany)
Günther Walze, Covestro AG (Germany)
Brita Wewer, Covestro AG (Germany)

Published in SPIE Proceedings Vol. 10127:
Practical Holography XXXI: Materials and Applications
Hans I. Bjelkhagen; V. Michael Bove Jr., Editor(s)

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