Diffractive distortion of holographic displays with inclined illumination

2021 ◽  
Author(s):  
Cheng-Ta Mu ◽  
Cheng-Huan Chen
Keyword(s):  
Holographic Displays

scholarly journals Computer-Generated Hologram Based on Reference Light Multiplexing for Holographic Display

2021 ◽  
Vol 11 (16) ◽  
pp. 7199
Author(s):  
Dapu Pi ◽  
Juan Liu
Keyword(s):  
Image Quality ◽  
Numerical Simulations ◽  
Light Wave ◽  
Information Capacity ◽  
Improve Image Quality ◽  
Multiple Images ◽  
Holographic Display ◽  
Light Waves ◽  
Computer Generated Holograms ◽  
Holographic Displays

In this article, we propose a reference light wave multiplexing scheme to increase the information capacity of computer-generated holograms. The holograms were generated by different reference light waves and superimposed together as a multiplexed hologram. A modified Gerchberg–Saxton algorithm was used to improve image quality, and different images could be reconstructed when the multiplexed hologram was illuminated by corresponding reference light waves. We performed both numerical simulations and optical experiments to demonstrate the feasibility of the proposed scheme. Numerical simulations showed that the proposed method could reconstruct multiple images successfully by a single multiplexed hologram and optical experiments are consistently good with numerical simulations. It is expected that the proposed method has great potential to be widely applied in holographic displays in the future.

scholarly journals Suppressing meta-holographic artifacts by laser coherence tuning

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Yaniv Eliezer ◽  
Geyang Qu ◽  
Wenhong Yang ◽  
Yujie Wang ◽  
Hasan Yılmaz ◽  
...  
Keyword(s):  
Spatial Coherence ◽  
Fine Tuning ◽  
Total Power ◽  
Image Sharpness ◽  
Continuous Tuning ◽  
Fine Spatial Resolution ◽  
Compact Size ◽  
Wide Range ◽  
Fabrication Defects ◽  
Holographic Displays

AbstractA metasurface hologram combines fine spatial resolution and large viewing angles with a planar form factor and compact size. However, it suffers coherent artifacts originating from electromagnetic cross-talk between closely packed meta-atoms and fabrication defects of nanoscale features. Here, we introduce an efficient method to suppress all artifacts by fine-tuning the spatial coherence of illumination. Our method is implemented with a degenerate cavity laser, which allows a precise and continuous tuning of the spatial coherence over a wide range, with little variation in the emission spectrum and total power. We find the optimal degree of spatial coherence to suppress the coherent artifacts of a meta-hologram while maintaining the image sharpness. This work paves the way to compact and dynamical holographic displays free of coherent defects.

RGB imaging volumes alignment method for color holographic displays

2016 ◽  
Author(s):  
Weronika Zaperty ◽  
Tomasz Kozacki ◽  
Radosław Gierwiało ◽  
Małgorzata Kujawińska
Keyword(s):  
Alignment Method ◽  
Holographic Displays

Flat Twist on Holographic Displays

Science ◽  
1993 ◽  
Vol 261 (5122) ◽  
pp. 685-685
Author(s):  
Ivan Amato
Keyword(s):  
Holographic Displays

P-120: Temperature Dependence of Dynamic Holographic Displays using Doped Liquid Crystals

2015 ◽  
Vol 46 (1) ◽  
pp. 1618-1620 ◽  
Author(s):  
Xiao Li ◽  
Pengcheng Zhou ◽  
Yan Li ◽  
Chao Ping Chen ◽  
Xinhong Jiang ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Temperature Dependence ◽  
Holographic Displays

Flat Twist on Holographic Displays

Science ◽  
1993 ◽  
Vol 261 (5122) ◽  
pp. 685-685
Author(s):  
I. Amato
Keyword(s):  
Holographic Displays

Auxiliary resonant scanner to increase the scanning capability of coarse integral holographic displays

2017 ◽  
Vol 15 (4) ◽  
pp. 040901-40904 ◽  
Author(s):  
Jhen-Si Chen Jhen-Si Chen ◽  
Quinn Smithwick Quinn Smithwick ◽  
Jin Li Jin Li ◽  
and Daping Chu and Daping Chu
Keyword(s):  
Holographic Displays

scholarly journals Light source optimization for partially coherent holographic displays with consideration of speckle contrast, resolution, and depth of field

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Seungjae Lee ◽  
Dongyeon Kim ◽  
Seung-Woo Nam ◽  
Byounghyo Lee ◽  
Jaebum Cho ◽  
...  
Keyword(s):  
Light Source ◽  
Safety Issue ◽  
Theoretical Models ◽  
Partial Coherence ◽  
Speckle Reduction ◽  
Depth Of Field ◽  
Light Sources ◽  
Speckle Contrast ◽  
Partially Coherent ◽  
Holographic Displays

Abstract Speckle reduction is an important topic in holographic displays as speckles not only reduce signal-to-noise ratio but also possess an eye-safety issue. Despite thorough exploration of speckle reduction methods using partially coherent light sources, the trade-off involved by the partial coherence has not been thoroughly discussed. Here, we introduce theoretical models that quantify the effects of partial coherence on the resolution and the speckle contrast. The theoretical models allow us to find an optimal light source that maximizes the speckle reduction while minimizing the decline of the other terms. We implement benchtop prototypes of partially coherent holographic displays using the optimal light source, and verify the theoretical models via simulation and experiment. We also present a criterion to evaluate the depth of field in partially coherent holographic displays. We conclude with a discussion about approximations and limitations inherent in the theoretical models.

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