Seereal

The SPIE Photonics Europe Conference in Strasbourg (France) will take place from 22 – 26 April 2018. In this event, SeeReal Technologies will present results of its research on a holographic head-mounted display. The results will be given as presentation 10676-103 in the conference Digital Optics for Immersive Displays (DOID18) in the poster session on 24 April from 6:00 PM – 7:30 PM. The title is “Optical design, assembly and characterization of a holographic head-mounted display” (Link to session).

The holographic head-mounted display is based on SeeReal’s proprietary Sub-Hologram and Viewing Window technology. Camera photographs that were made at a laboratory setup demonstrate that the head-mounted display supports focus of the eye lens to correct depths of the holographic 3D scene. Such correct focus information is essential for good 3D quality.

The presentation will be given by Anne Gärtner. Anne was a master student from the Ernst-Abbe-Hochschule in Jena. She did the research of her master thesis on a holographic head-mounted display at SeeReal Technologies.

Also, SeeReal Technologies will present results of its research with Fraunhofer Institute for Applied Polymer Research (IAP), Potsdam, Germany on Bragg polarization gratings (Bragg-PG) and their applications in AR/VR displays. The results will be presented in the conference Digital Optics for Immersive Displays (DOID18) in the Session 3: Holographic Optics for AR/VR Systems on April 24, at 2:50 PM (Link to session). The title of the presentation is “Bragg polarization gratings used as switchable elements in AR/VR holographic displays” (Paper 10676-14).

Bragg polarization gratings represent a new type of polarization sensitive gratings possessing unique properties. Circular polarized light either passes through the Bragg-PG or is diffracted depending on handedness of polarization (circular right (CR) or circular left (CL)). This enables to use the Bragg-PG as a switchable DOE in combination with external polarization switch. Diffraction efficiency (DE) can reach 100% at small thickness of ca. 1.5 µm. The investigated Bragg-PGs possess broad angular and spectral acceptance due to their small thickness. The special material approach developed by IAP and SRT allows creating Bragg PG with very small periods and, correspondingly, large deflection angles (up to 42 deg). The switching angle can be doubled using stack of two Bragg PG due to their specific properties. Material developed allows recording both symmetric and slant gratings. Unique properties of Bragg-PGs make them very attractive for application in AR/VR displays. Some possible applications are considered.

The presentation will be given by Dr. Oksana Sakhno (Fraunhofer IAP, Potsdam, Germany).