High-resolution optical scanning holographic slice imaging method based on variable pupils

A high-resolution, optical scanning technology, applied in the field of optical scanning, can solve problems such as large noise and practical limitations, and achieve the effect of a wide range of applications

Inactive Publication Date: 2013-02-13
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0006] The document 'Depth resolution enhancement in optical scanning holography with a dual-wavelength laser source' proposes a method to improve the axial resolution of slice imaging by using a dual-wavelength laser. It uses lasers with output wavelengths of 632nm

Method used

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  • High-resolution optical scanning holographic slice imaging method based on variable pupils
  • High-resolution optical scanning holographic slice imaging method based on variable pupils
  • High-resolution optical scanning holographic slice imaging method based on variable pupils

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Embodiment

[0056] Such as figure 2 As shown, in order to simplify the problem, figure 2 It is a schematic diagram of the object to be tested in the present invention, and the object to be tested only includes two slices of information. In the first optical scan, the axial positions of the two slices of the object are , , and The axial distance is 10nm, and each slice size is , the matrix size is , where the scanning process can be realized by following the steps shown below:

[0057] Step 1 Set the variable pupil to , get the first Fresnel zone plate FZP 1 , the first scan of the object

[0058] (1) if figure 1 As shown, the light with angular frequency ω emitted by the same light source is split into two beams by the first polarizing beam splitter BS1, and the first beam passes through the first pupil form a plane wave ; The first beam of light passes through the first pupil after passing through the acousto-optic modulator to produce a frequency shift of Ω , th...

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Abstract

The invention discloses a high-resolution optical scanning holographic slice imaging method based on variable pupils, belongs to the field of optical scanning and mainly solves problems of large out-of-focus noises existing when images of any two-dimensional slice are reconstructed in the prior art. According to the method, a two-dimensional scanning mirror is used for controlling deflection of a first Fresnel zone plate so as to achieve primary two-dimensional scanning of an object to be detected to obtain a first matrix equation; after a second pupil is deflected, the two-dimensional scanning mirror controls deflection of a second Fresnel zone plate so as to achieve secondary two-dimensional scanning of the object to be detected to obtain a second matrix equation; and the two matrix equations are combined, and a conjugate gradient algorithm is introduced to achieve slice imaging. According to the high-resolution optical scanning holographic slice imaging method based on the variable pupils, by means of the technical scheme, high-accuracy slice imaging is achieved, the out-of-focus noises are greatly reduced, and the method is applicable to each optical field for acquiring slice imaging.

Description

technical field [0001] The invention belongs to the field of optical scanning, and in particular relates to a high-resolution optical scanning holographic slice imaging method based on a variable pupil. Background technique [0002] Optical scanning holography, referred to as OSH, is a non-traditional imaging technology based on Fresnel zone plate scanning, which achieves high-resolution three-dimensional imaging of targets through two-dimensional optical scanning. It is used in biomedical imaging and fluorescent object imaging. , 3D holographic television system and optical remote sensing and other fields have broad application prospects. [0003] The two-dimensional hologram obtained by optical scanning holography technology contains the complete three-dimensional information of the object. Therefore, an important analysis and processing step of the object hologram in optical scanning holography technology is the slice imaging of the object, that is, any two-dimensional se...

Claims

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Application Information

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IPC IPC(8): A61B5/00G03H1/12
Inventor 欧海燕王秉中
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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