Non-iteration complex amplitude modulation holographic projection method

A technology of holographic projection and complex amplitude, which is applied in the field of holographic display, can solve the problems of increased calculation, large calculation of iterative algorithm, and reduced quality of reconstructed objects, and achieve the effect of image contrast enhancement, image quality improvement and calculation speed improvement

Active Publication Date: 2016-12-14
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high coherence of the laser light used in the display, additional intensity patterns will be generated in the reconstructed light field due to coherent interference between adjacent pixels, resulting in a grainy effect on the desired light field, called speckle noise, Significantly reduced quality of reconstructed objects
At the same time, the iterative nature of the GS algorithm also greatly increases the amount of calculation, which is not conducive to the development of real-time display in the holographic field.
Due to the lack of complex amplitude modulation devices, real complex amplitude light field reconstruction cannot be realized, and the iterative algorithm has a large amount of calculation, which makes the current holographic display technology face a huge bottleneck

Method used

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  • Non-iteration complex amplitude modulation holographic projection method
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  • Non-iteration complex amplitude modulation holographic projection method

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Embodiment

[0039] Embodiment: The monochromatic green light with a wavelength of 532 nanometers emitted by the monochromatic laser 8 is used for projection; the phase spatial light modulator 2 adopts the phase spatial light modulator Holoeye Pluto produced by Holoeye Company of Germany, and its specification is 1920×1080 pixels , the pixel pitch is 8 microns, that is, Δx 0 =Δy 0 =8 μm; the focal length f of the first lens 4 1 is 0.25 meters; the focal length f of the second lens 6 2 is 0.3 meters. Then the inclination angle of the inclined plane in the encoding formula is sinα≈0.02351. According to the parameters determined above, the figure 1 The method shown yields phase-only holograms after encoding.

[0040] The coordinates of the rectangular aperture are (0.5878cm, 0), and the size of the rectangular aperture is 0.5878cm×0.5878cm. The distance between the lens 4 and the spatial light modulator 3 is 0.25 meters, and the distance between the lens 4 and the rectangular aperture i...

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Abstract

The invention discloses a non-iteration complex amplitude modulation holographic projection method which includes the steps of decomposing light vector of each pixel of a complex amplitude light field into two pure phase values to obtain two pure phase holograms with equal size of an original image, sampling and synthesizing the two pure phase holograms through chequer patterns, adding inclination plane wave factors on the synthesized pure phase hologram to obtain an encoded pure phase hologram, sequentially arranging a phase spatial light modulator, a light splitting prism, a first lens, a filtering diaphragm, a second lens and a screen, transmitting the encoded pure phase hologram to the phase spatial light modulator through a computer, and observing the complex amplitude light field on an output side screen through a 4f optical path system. Through the method, reconstruction image speckles can be eliminated, influence of device zero-order wave on a reconstructed image can be prevented, and the calculating speed of a hologram is increased.

Description

technical field [0001] The invention relates to a holographic display method, in particular to a non-iterative complex amplitude modulation holographic projection method. Background technique [0002] Holographic display technology is a technology that can reconstruct the complex amplitude light field of an object, and is therefore considered to be the most ideal next-generation 3D display technology. However, due to the lack of complex amplitude modulation devices capable of simultaneously modulating amplitude and phase, the GS iterative algorithm is widely used in the field of digital holography to generate a pure phase hologram and obtain the target amplitude through Fourier transform. The limitation of the GS iterative algorithm is that it can only control the amplitude as the target output, while the phase output is random. Due to the high coherence of the laser light used in the display, additional intensity patterns will be generated in the reconstructed light field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/08
CPCG03H1/0841G03H2001/085G03H2001/0858G03H2210/10
Inventor 祁怡君夏军
Owner SOUTHEAST UNIV
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