Referenceless phase holography for reconstruction of complete optical wave fields for metrology and displays II (RELPH II)
Final Report Abstract
Holography still represents - at least in principle - the gold standard of three-dimensional display. In contrast to volumetric displays as well as stereoscopic or light field technologies, it allows to satisfy all depth cues of the human perception, including full parallax, a large depth of field, and a wide angle of view. While holography is well-established in the case of static scenes, it still remains a technological challenge to realize dynamic holographic displays. One of the primary problems is the low space–bandwidth product (SBP) of currently available dynamic spatial light modulators (SLM). Furthermore, existing attempts for holographic 3D displays suffer from the presence of a d.c.-term and a conjugate image, utilizing the available SBP suboptimally. The novel referenceless phase holography (RELPH) aims at the efficient use of the SBP of current SLMs to avoid these drawbacks. Instead of recreating the holographically recorded interference pattern, as obtained from the superposition of an object wave with a reference wave, it makes use of multiple phase-only SLMs to generate a desired complex amplitude at a given plane in space. The general feasibility of the RELPH concept was demonstrated in the first funding phase of this project. In this second phase we advanced the RELPH method to enable the multicolor display of 3D scenes, viewable with the naked eye. Along the way we investigated and reduced image degradations caused by speckle noise via temporal multiplexing of several redundant speckled intensity distributions. Furthermore we developed a novel shear-interferometer based calibration procedure for mechanically or thermally induced deformations of the SLMs which resulted in spurious interference patterns. Since RELPH allows the display of arbitray full wave fields, one possible application is the quasi-real-time display of physically existent 3D scenes. We were able to demonstrate the display of holographically recorded scenes after transforming hologram pixel pitch to the SLM pixel pitch.
Publications
- Holographic wave field synthesis using refractive elements. Proc. 17th Workshop on Information Optics (WIO), Québec, QC, Canada (2018) 1-4
Falldorf, C; Bergmann, R B
(See online at https://doi.org/10.1109/WIO.2018.870529) - 3D Imaging System Based on Spherical Wave Field Synthesis. Appl. Sci. 9,18 (2019), 3862
Falldorf, C; Chou, P-Y; Prigge, D; Bergmann, R B
(See online at https://doi.org/10.3390/app9183862) - Multicolor holographic imaging of 3D scenes using referenceless phase holography (RELPH). Photonics 8, 7 (2021), 247
Müller, A F; Rukin, I; Falldorf, C; Bergmann, R B
(See online at https://doi.org/10.3390/photonics8070247) - Referenceless phase holography for displaying 3D scenes captured by digital holography. DGaO-Proceedings 2021
Müller, A F; Gutiérrez-Canas Pazos, B; Falldorf, C; Bergmann, R B
