Digital Holographic Three-Dimensional Video Displays

Abstract

Cataloged from PDF version of article.Holography aims to record and regenerate volume\ud filling light fields to reproduce ghost-like 3-D images that are\ud optically indistinguishable from their physical 3-D originals.\ud Digital holographic video displays are pixelated devices on which\ud digital holograms can be written at video rates. Spatial light\ud modulators (SLMs) are used for such purposes in practice; even\ud though it is desirable to have SLMs that can modulate both the\ud phase and amplitude of the incident light at each pixel, usually\ud amplitude-only or phase-only SLMs are available. Many laboratories\ud have reported working prototypes using different designs.\ud Size and resolution of the SLMs are quite demanding for\ud satisfactory 3-D reconstructions. Space–bandwidth product\ud (SBP) seems like a good metric for quality analysis. Even though\ud moderate SBP is satisfactory for a stationary observer with no\ud lateral or rotational motion, the required SBP quickly increases\ud when such motion is allowed. Multi-SLM designs, especially over\ud curved surfaces, relieve high bandwidth requirements, and\ud therefore, are strong candidates for futuristic holographic video\ud displays. Holograms are quite robust to noise and quantization. It\ud is demonstrated that either laser or light-emitting diode (LED)\ud illumination is feasible. Current research momentum is increasing\ud with many exciting and encouraging results

Holographic optogenetic stimulation of patterned neuronal activity for vision restoration

“…Other possibilities for speckle reduction are the use of temporally and/ or spatially incoherent light sources. Incoherent light sources such as LEDs can be combined with SLMs to generate desired light patterns using optical transfer function design 34 and CGH 35 .…”

Image-Quality Enhancement for a Holographic Wavefront Color Printer by Adaptive SLM Partitioning

“…Last, the final CGH files were obtained by the fast phase-added algorithm described in Sec. 4. Photographs of reconstructions from holograms printed by the conventional mosaic method and by adaptive SLM partitioning are shown in Figs.…”

“…The introduction of carrier frequency in holographic recording by Leith and Upatnieks in 1962 [2], and the publication by Denisuyk [3] in the same year on recording white-lightviewable reflection holograms, pushed forward optical metrology and display holography of three-dimensional (3D) still images. Advances in computers and optoelectronics enabled the development of holographic imaging technologies, such as holographic video [4] and holographic printing [5]. The current status of research on dynamic holographic display indicates that this technology still has a long way to go before the release of a commercial product.…”

3D Capture and 3D Contents Generation for Holographic Imaging

“…If the object lateral size D is much greater than the sensor size, the minimum distance between the object and the photo-sensor is about z min ¼ DΔ c =λ c . Usage of coherent light seriously restricts the viewing angle of the holographic display and the size of the reconstructed image [21]. A planar configuration of many SLMs allows for visualization of larger objects [22] but the problem with the small viewing angle remains.…”