Mr. Max Wieland Profile

Max Wieland

at Robert Bosch GmbH

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Proceedings Article | 8 March 2023 Poster + Paper

Highly transparent wave front printed volume holograms realized by amplitude-modulated incoherent pre-illumination

Tobias Wilm, Max Wieland, Reinhold Fiess, Wilhelm Stork

Proceedings Volume 12445, 124450S (2023) https://doi.org/10.1117/12.2647361

KEYWORDS: Holography, Wavefronts, Printing, Diffraction, Holograms, Transparency, Cameras, Spatial light modulators, Modulation, Glasses

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We present highly transparent, wave front printed volume holographic optical elements (vHOEs), realized with a new recording method based on the pre-illumination of incoherent light patterns. The introduced amplitudemodulated pattern illuminates a distinct area on the unexposed, photopolymer-based holographic recording material prior to the hologram recording sequence. The incoherent pre-illumination scheme enables a precise tuning of the material’s local photosensitivity without the formation of a holographic volume diffraction grating. As a consequence, the pre-illumination exposure significantly suppresses the formation of transparency diminishing structures in the material that are formed concurrently with the volume diffraction grating during the hologram recording sequence. The pre-illumination component is integrated in an extended immersion-based wave front printing setup, which realizes vHOEs by sequentially recording single holographic elements in an array-like structure. A wide range of different recording configurations is enabled by our recording setup due to independent modulation of both wave fronts and the possibility to realize large off-axis recording angles. We introduce two hologram characterization methods, based on a diffraction efficiency and a slanted-edge method analysis, which are used to evaluate the implemented pre-illumination method and demonstrate significant improvements to the see-through quality of the presented wave front recorded vHOEs.

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