We have developed a full-color full-parallax digital 3D holographic display system by using 24 physically tiled SLMs, an optical scan tiling approach and two sets of RGB lasers, which could display 378-Mpixel holograms at 60 Hz, with a displayed image size of 10 inch in diagonal. In this paper, we will review and compare three different holographic display systems developed by our group from various aspects, including SLMs, lasers, optics designs, hologram computation, data transmission, and system synchronization. We will also discuss the bottlenecks and prospects of further development of the system for practical applications.
The conventional speckle contrast measures only speckle severity, and is unable to characterize granularity and anisotropy in displayed images, which are easily picked up by human observers. Here, we propose a comprehensive method based on the power spectral density which allows the simultaneous measurement of three components of laser speckle-severity, granularity and anisotropy-as a superior way to evaluate both speckle and speckle reduction techniques.
A real-time background correction technique is reported for digital data page holographic storage. Two inverted binary
data pages are recorded at the same location in recording media with two inverted random phase coded reference beams
using a rotating half-wave plate. Adding the two detected inverted data pages from same media location creates
background image with noise at that media location. The background image is used to successfully perform the
background correction to reduce the noise of detected digital data pages.
KEYWORDS: 3D displays, Digital holography, Computer generated holography, Holography, Holograms, Spatial light modulators, Algorithm development, Data storage, 3D image processing, 3D optical data storage
Holographic display is a true three-dimensional (3D) display technology presenting all depth cues without using any special
glasses. In this paper, we first introduce a monochrome digital 3D holographic display system developed at Data Storage
Institute (DSI), which is capable of displaying both static and dynamic 3D objects reconstructed from computer-generated
holograms (CGHs). The system can also display 50-Mpixel holograms at 25 Hz refresh rate via a novel hologram tiling
approach, which enables the increase of displayed image size. A futuristic vision for full high-definition (HD) digital 3D
holographic display is then proposed and analyzed. The dynamic reconstruction of full-HD 3D objects from CGHs has been
preliminarily demonstrated. Finally, we introduce the development trends of its enabling technologies such as highperformance
computing, new algorithms, data storage and transmission, spatial light modulator (SLM) and RGB (red, green
and blue) laser sources.
The current limitation in pixel count of a single spatial light modulator (SLM) is one of the technological hurdles that must be overcome to produce a holographic 3-D display with a large image size. A conventional approach is to tile subholograms that are predivided from a reconfigurable computer-generated hologram (CGH) with a high pixel count. We develop a new approach to achieve a 50 Mpixel display by tiling reconstructed subholograms computed from a predivided 3-D object. The tiling is done using a two-axis scanning mirror device with a new tiling sequence. A shutterless system design is also implemented to enable effective tiling of subholograms. A high-speed digital micromirror device (DMD) at 6 kHz with 1920×1080 pixels is utilized to reconstruct the subholograms. Our current system shows the potential to tile up to 120 subholograms, which corresponds to about 240 Mpixels. The approach we demonstrate gives a scalable solution to achieve a gigapixel-level display in the future.
A 3D-shift multiplexing is reported with converging signal and diverging random phase coded reference beam into the
Cu:Ce:Tb:CLN crystal. Shift-selectivity at first null along x,y and z-axis is measured to be 1.5, 5 and 5mm for random
phase-coded reference beam. Low capacity data page with only 1-4 kbits were successfully recorded/retrieved and the
achievable raw areal density of >350 Gbit/in2 will be reported.
A laminated holographic recording medium based on photorefractive lithium niobate crystal is reported for the first time.
The medium consists of a piece of photorefractive crystal, a data tracking layer, an intermediate dichroic mirror layer and
an anti-reflection layer. Such a holographic medium is able to perform hologram recording and retrieving with
compatibility with collinear and coaxial holographic recording schemes.
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