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Proceedings Paper

Performance optimization in mass production of volume holographic optical elements (vHOEs) using Bayfol HX photopolymer film
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 smart glasses and augmented reality (SG and AR, 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, discuss the opto-mechanical construction and outline the downstream process of the installed vHOE replication line. Moreover, we focus on aspects like performance optimization of the copy vHOE, the bleaching process and the suitable choice of protective cover film in the re-lamination step, preparing the integration of the vHOE into the final device.

Paper Details

Date Published: 15 May 2017
PDF: 15 pages
Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102330G (15 May 2017); doi: 10.1117/12.2265022
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. 10233:
Holography: Advances and Modern Trends V
Miroslav Hrabovský; John T. Sheridan; Antonio Fimia, Editor(s)

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