A Method of Eliminating Digital Holographic Zero-Order Image by One-step Fixed Angle Phase Shift

A digital holography, fixed-angle technology, applied in the field of digital holography, can solve the problems of large error of multi-step phase shift and adverse effects of results, and achieve the effect of shortening time, reducing adverse effects and ensuring accuracy

Inactive Publication Date: 2017-04-19
NANKAI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional multi-step phase shift has large errors, which will adversely affect the results, and proposes a digital holographic method that eliminates the zero-order image by one-step fixed-angle phase shift

Method used

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  • A Method of Eliminating Digital Holographic Zero-Order Image by One-step Fixed Angle Phase Shift
  • A Method of Eliminating Digital Holographic Zero-Order Image by One-step Fixed Angle Phase Shift
  • A Method of Eliminating Digital Holographic Zero-Order Image by One-step Fixed Angle Phase Shift

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Embodiment 1

[0040] Embodiment 1: Digital holography method of one-step fixed-angle phase shift zero-order elimination

[0041] First, use the Nankai University emblem as an object to construct object light in MATLAB. Establish a Cartesian coordinate system x-y on the recording plane, and illuminate the Nankai University emblem with parallel light with an amplitude of 3V / m and a propagation direction along the x-axis, then the transmitted light is the object light, A o is the amplitude of the object light, is the phase of the object light, where the image of the object and the object light is as figure 2 and image 3 shown.

[0042] Second, build two parallel lights with opposite phases and different amplitudes as reference lights, where the amplitude A of reference light 1 R1 =1V / m, the amplitude A of reference light 2 R2 =2V / m, the angle between reference light 1 and reference light 2 and the x-axis Set the wavelength of the two reference beams to 800nm, and record Then the ph...

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Abstract

The invention provides a method for eliminating a digital holographic zero-order image through one-step fixed angle phase shift. According to the method, a linkage double-reference light rectangular light path is firstly proposed, a parallel opposite reflector set loaded on a micromotion translation platform in the light path guarantees that the phase-shift magnitude of two beams of reference light is opposite numbers when the micromotion translation platform conducts displacement, and the feature can make certain digital holographic technologies be easier and convenient to operate. On the basis of the light path feature, a matched algorithm is proposed, an existing phase-shift zero-elimination-level digital homographic technique is changed from multiple steps to one-step phase shift, accordingly the error caused by the multiple steps is eliminated, and the phase shift technology is made to be easier and more convenient to use and higher in operability.

Description

technical field [0001] The invention relates to the technical field of digital holography, in particular to an off-axis or coaxial digital holography method for eliminating zero-order images through one-step fixed-angle phase shift. Background technique [0002] When the British scientist Gabor was engaged in improving the resolving power of the electron microscope, he first proposed the idea of ​​holography, and in 1948, he obtained the hologram and its reconstruction image for the first time by using a mercury lamp. Holography has the advantages of large information capacity and three-dimensional reproduction, but at the same time, the zero-order image of this coaxial holography is also coaxial with the reproduction of the original object field, which reduces the quality of the reproduction. For this reason, Lis et al. proposed off-axis holography to overcome the influence of the zero-order image on the reproduced image, but off-axis holography has higher requirements on t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/10
Inventor 杨勇谢东卓赵东亮翟宏琛
Owner NANKAI UNIV
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