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On the impact of incoherent pre-exposure on vHOE recording in Bayfol HX film for see-through applications
Author(s): Friedrich-Karl Bruder; Thomas Fäcke; Sven Hansen; Christel Manecke; Christian Rewitz; Thomas Rölle; Enrico Orselli; Brita Wewer
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Paper Abstract

Head-up-displays (HUD) and head-mounted-displays (HMD) have in common to utilize an optical combiner for electronic image creation in a see-through optical setup. Volume holographical optical elements (vHOE) appeal to system designers by their lightweight, thin film construction that also enables concepts to integrate those into lens or windshield manufacturing. vHOEs can be customized towards optical system requirements through their adaptable angular and spectral Bragg selectivity, while also diffraction efficiencies can be widely chosen to meet the overall optical specifications. Photopolymer films (Bayfol® HX film) have been recently introduced into the market place and prove themselves as easy to process materials. In this paper we investigate the impact of incoherent pre-exposure, which is a technique that can be used to overcome oxygen inhibition in a very convenient way. Incoherent light also can be used to reduce the dynamic range of the photopolymer film to fine tune diffraction efficiency and reduce over-modulation of transmission HOEs. Another interesting aspect is to minimize coherent media scatter that can occur at long exposure times. So reduction of the overall applied coherent light dosage is the key here. Incoherent pre-exposure therefore should be considered as an integral part of a holographer’s toolset to perfect the recording results for vHOEs.

Paper Details

Date Published: 19 February 2018
PDF: 18 pages
Proc. SPIE 10558, Practical Holography XXXII: Displays, Materials, and Applications, 105580B (19 February 2018); doi: 10.1117/12.2288495
Show Author Affiliations
Friedrich-Karl Bruder, Covestro AG (Germany)
Thomas Fäcke, Covestro AG (Germany)
Sven Hansen, Covestro AG (Germany)
Christel Manecke, Covestro AG (Germany)
Christian Rewitz, Covestro AG (Germany)
Thomas Rölle, Covestro AG (Germany)
Enrico Orselli, Covestro AG (Germany)
Brita Wewer, Covestro AG (Germany)

Published in SPIE Proceedings Vol. 10558:
Practical Holography XXXII: Displays, Materials, and Applications
Hans I. Bjelkhagen; V. Michael Bove, Editor(s)

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