Presentation + Paper
3 March 2022 Reliable photopolymer for new applications: vHOEs recorded into Bayfol HX film resisting the environment
Friedrich-Karl Bruder, Johannes Frank, Sven Hansen, Roland Künzel, Jonas Künzel, Alexander Lorenz, Christel Manecke, Richard Meisenheimer, Jack Mills, Lena Pitzer, Igor Pochorovski, Thomas Rölle
Author Affiliations +
Abstract

Bayfol® HX photopolymer films prove themselves as easy-to-process recording materials for volume holographic optical elements (vHOEs) and are available in customized grade at industrial scale. Their full-color (RGB) recording and replay capabilities are two of their major advantages. Moreover, the adjustable diffraction efficiency, tunable angular and spectral selectivity of vHOEs recorded into Bayfol® HX as well as their unmatched optical clarity enables superior invisible “off Bragg” optical functionality. As a film product, the replication of vHOEs in Bayfol® HX can be carried out in a highly cost-efficient and purely photonic roll-to-roll (R2R) process. Utilizing thermoplastic substrates, Bayfol® HX was demonstrated to be compatible to state-of-the-art plastic processing techniques like thermoforming, film insert molding and casting, which opened using a variety of industry-proven integration technologies for vHOEs. Therefore, Bayfol® HX makes its way in applications in the field of augmented reality such as Head-up-Displays (HUD) and Headmounted- Displays (HMD), in free-space combiners, in plastic optical waveguides, and in transparent screens. Also, vHOEs made from Bayfol® HX are utilized in highly sophisticated spectrometers in astronomy as well as in narrow band notch filters for eyeglasses against laser strikes.

Especially in the automotive application field the required reliability performance is very high and demanding. Bayfol® HX film itself and its integration in respective parts were further optimized to show significantly increased resilience against environmental conditions. Those parts pass automotive standard tests like accelerating weathering tests (PV 3930) and thermal cycling test (PV 1200), while keeping the performance level of the vHOEs recorded into Bayfol® HX film unchanged. This enables a long-term stability of the final product and thus enabling the material to be used in even more applications. This especially holds true for permanent or most frequently outdoor applications such as automotive lighting, HUD or HMD.
Conference Presentation
© (2022) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Friedrich-Karl Bruder, Johannes Frank, Sven Hansen, Roland Künzel, Jonas Künzel, Alexander Lorenz, Christel Manecke, Richard Meisenheimer, Jack Mills, Lena Pitzer, Igor Pochorovski, and Thomas Rölle "Reliable photopolymer for new applications: vHOEs recorded into Bayfol HX film resisting the environment", Proc. SPIE 12026, Practical Holography XXXVI: Displays, Materials, and Applications, 1202602 (3 March 2022); https://doi.org/10.1117/12.2607740
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KEYWORDS
Holograms

Glasses

Holography

Humidity

Heads up displays

Head-mounted displays

Reliability

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