Holographic calculation method for suppressing laser speckle effect

A technology of laser speckle and calculation method, which is applied in optics, optical components, instruments, etc., can solve the problems of large amount of hologram calculation, high requirements, unfavorable dynamic video display applications, etc., achieves optimization of amplitude and phase distribution, improves calculation effect of speed

Active Publication Date: 2015-03-11
SOUTHEAST UNIV
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Problems solved by technology

However, this method not only requires a lot of calculations for holograms, but also has higher requirements for spatial light modulators when loading multiple holograms in sequence, which is not conducive to the display application of dynamic video

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  • Holographic calculation method for suppressing laser speckle effect
  • Holographic calculation method for suppressing laser speckle effect
  • Holographic calculation method for suppressing laser speckle effect

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Embodiment Construction

[0036] In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] Such as figure 1 As shown, a holographic calculation method for suppressing laser speckle effect of the present invention comprises the following steps:

[0038] (10) Determine the distance z from the object to be reconstructed to the holographic surface, which is the distance from the reconstruction screen to the spatial light modulator in the holographic display system; the position of the phase spatial light modulator forms the holographic surface (u, v ), the position of the object to be reconstructed forms the object plane (x, y);

[0039] (20) The Huygens Fresnel diffraction calculation formula shown in formula (1) can be quickly calculated by using different numerical calculation methods, and different calculation methods can be expressed as:

[0040] h ( ...

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Abstract

The invention discloses a holographic calculation method for suppressing laser speckle effect. The method includes the steps of 10, setting a positon of a spatial light modulator into a holographic plane (u, v) and a positon of an object to be reconstructed, into an objective plane (x, y), and determining a distance z from the objective plane (x, y) to the holographic plane (u, v); 20, establishing a function of light propagation between the holographic plane (u, v) and the objective plane (x, y), and calculating a complex amplitude hologram; 30, correcting the complex amplitude hologram obtained in the step 20 to obtain complex amplitude h'(u, v)=A'(u, v)*exp[i Phi<0>(u, v)] of upper light field of the updated holographic plane; 40, extracting a phase factor to obtain an all-phase hologram p(u, v)=exp[i Phi<0>(u, v)], and encoding and calculating p(u, v) to obtain a hologram displayable. The method has the advantages that the speckle effect caused by high coherence of laser is effectively alleviated, and reconstruction quality of the hologram is greatly improved.

Description

technical field [0001] The invention relates to a holographic calculation method for suppressing laser speckle effect. The holographic calculation method converts a complex amplitude hologram into a pure phase hologram by using an error diffusion filter, and optimizes the amplitude distribution and phase distribution of an object reconstructed by the hologram. Therefore, the influence of the laser speckle effect on the quality of holographic reconstruction is eliminated. Background technique [0002] For the traditional holographic display, the generation of the phase hologram is based on the classic Gerschberg-Saxton (GS) iterative algorithm, which optimizes the amplitude information of the reconstructed object through iteration to obtain the reconstruction content we want. The process of hologram display is to use Fourier transform or Fresnel diffraction to reproduce the light field of the object. However, due to the high coherence of the laser light used in the display, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/12G03H1/16G03H1/32G02B27/48
Inventor 常琛亮夏军雷威
Owner SOUTHEAST UNIV
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