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Method for eliminating digital holographic zero-order image through one-step arbitrary angle phase shift

A technology of digital holography and arbitrary angle, applied in the field of digital holography, can solve problems such as adverse effects, achieve the effect of shortening time, reducing experimental steps, and reducing adverse effects

Active Publication Date: 2015-07-29
NANKAI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the limitation of multi-step phase shift and each step phase shift is a fixed value in the traditional phase shift method, thereby avoiding the problem that a large error will adversely affect the result, and proposes a phase shift method through one step of any angle Digital Holographic Method to Eliminate Zero-order Image

Method used

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  • Method for eliminating digital holographic zero-order image through one-step arbitrary angle phase shift
  • Method for eliminating digital holographic zero-order image through one-step arbitrary angle phase shift
  • Method for eliminating digital holographic zero-order image through one-step arbitrary angle phase shift

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Embodiment 1

[0041] Embodiment 1: One-step arbitrary angle phase shift zero-order digital holography method

[0042] 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, with an amplitude of 3V / m (volts / meter), and parallel light with an angle between the propagation direction and the x-axis of θ=1.1*pi / 180 to irradiate the Nankai University emblem, the transmitted light is for 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.

[0043] Second, build two parallel lights with zero phase and different amplitudes as reference lights, where the amplitude of the first reference light (Volts / meter), the amplitude of the second reference light (Volts / meter), the two reference beams propagate along the x-axis direction, and the wavelength of the two reference be...

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Abstract

The invention discloses a method for eliminating a digital holographic zero-order image through one-step arbitrary angle phase shift. A linkage coaxial dual-reference-light light path is provided for the first time; by adjusting a beam splitting crystal loaded to an inching translation platform in the light path, the phase shift magnitudes of two beams of reference light are guaranteed to be -alpha and 2alpha when the inching translation platform displaces. Based on the light path, a matched algorithm is provided, the existing phase shift zero-order digital holographic elimination technology is changed into one-step phase shift from multiple steps of phase shift, the phase shift magnitude is arbitrary, and the error produced by multi-step phase shift and movement of the inching translation platform is eliminated, so the phase shift technology is easier and more convenient and the operability is higher.

Description

technical field [0001] The invention relates to the technical field of digital holography, in particular to a digital holographic method for eliminating zero-order images through one-step arbitrary 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 the hologram reco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/04
Inventor 杨勇谢东卓赵东亮翟宏琛
Owner NANKAI UNIV
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