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Proceedings Paper

Second harmonics HOE recording in Bayfol HX
Author(s): Friedrich-Karl Bruder; Thomas Fäcke; Rainer Hagen; Dennis Hönel; Enrico Orselli; Christian Rewitz; Thomas Rölle; Günther Walze; Brita Wewer
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Paper Abstract

Volume Holographic Optical Elements (vHOEs) provide superior optical properties over DOEs (surface gratings) due to high diffraction efficiencies in the -1st order and their excellent Bragg selectivity. Bayer MaterialScience is offering a variety of customized instant-developing photopolymer films to meet requirements for a specific optics design of a phase hologram. For instance, the photopolymer film thickness is an ideal means to adjust the angular and the spectral selectivity while the index modulation can be adopted with the film thickness to achieve a specific required dynamic range. This is especially helpful for transmission type holograms and in multiplex recordings. The selection of different substrates is helpful to achieve the overall optical properties for a targeted application that we support in B2B-focused developments. To provide further guidance on how to record volume holograms in Bayfol HX, we describe in this paper a new route towards the recording of substrate guided vHOEs by using optimized photopolymer films. Furthermore, we discuss special writing conditions that are suitable to create higher 2nd harmonic intensities and their useful applications. Due to total internal reflection (TIR) at the photopolymer-air interface in substrate guided vHOEs, hologram recording with those large diffraction angles cannot usually be done with two free-space beams. Edge-lit recording setups are used to circumvent this limitation. However, such setups require bulky recording blocks or liquid bathes and are complex and hard to align. A different approach that we present in this paper is to exploit 2nd harmonic grating generation in a freespace recording scheme. Those 2nd harmonic components allow the replay of diffraction angles that are normally only accessible with edge-lit writing configurations. Therefore, this approach significantly simplifies master recordings for vHOEs with edge-lit functionalities, which later can be used in contact copy schemes for mass replication. In this paper, we will discuss and illustrate recording parameters to influence 2nd harmonic efficiency in optimized photopolymer films and will explain preferred geometries for recording.

Paper Details

Date Published: 8 May 2015
PDF: 13 pages
Proc. SPIE 9508, Holography: Advances and Modern Trends IV, 95080G (8 May 2015); doi: 10.1117/12.2178269
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)
Enrico Orselli, Bayer MaterialScience AG (Germany)
Christian Rewitz, Bayer MaterialScience AG (Germany)
Thomas Rölle, Bayer MaterialScience AG (Germany)
Günther Walze, Bayer MaterialScience AG (Germany)
Brita Wewer, Bayer MaterialScience AG (Germany)


Published in SPIE Proceedings Vol. 9508:
Holography: Advances and Modern Trends IV
Miroslav Hrabovský; John T. Sheridan; Antonio Fimia, Editor(s)

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