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Device and method for generating spatial helical beam array using periodic binary phase plate

A binary phase plate, helical beam technology, applied in optics, optical components, instruments, etc., can solve the problems of limited array space helical beam, complex optical path, large pixel size, etc., to achieve the effect of high energy utilization and easy implementation

Active Publication Date: 2021-09-21
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, there were some problems in the method of using liquid crystal spatial light modulators to generate spatial spiral beams. For example, the energy utilization rate of liquid crystal spatial light modulators was not high, and the pixel size of liquid crystal spatial light modulators was large, making it difficult to generate small-scale array vortices. Beam; the optical path used is relatively complicated, and the price of the liquid crystal spatial light modulator is relatively expensive, these shortcomings limit the application of the array space helical beam in actual production and life
[0004] The inventor found that the energy utilization rate of the liquid crystal spatial light modulator in the prior art is not high, and the optical path adopted is relatively complicated, which limits the application of the array space helical beam in actual production and life

Method used

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  • Device and method for generating spatial helical beam array using periodic binary phase plate
  • Device and method for generating spatial helical beam array using periodic binary phase plate
  • Device and method for generating spatial helical beam array using periodic binary phase plate

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Embodiment 1

[0043] In a typical implementation of the present application, such as figure 1 Shown, the optical path diagram of the present invention is as figure 1 shown. figure 1 Among them, a laser light source 1 , a beam expander collimating mirror 2 , a binary phase plate 3 , a first Fourier lens 4 , a filter 5 , and a second Fourier lens 6 .

[0044] Laser light source 1 adopts existing laser light source;

[0045] Beam expander collimating mirror 2 is arranged in the direction in which the light source emits light, and is used to convert the light from the light source into a large-diameter parallel beam;

[0046] The binary phase plate 3 is arranged on the rear end of the beam expander collimating mirror, and is used to modulate the wavefront of the light field of the large-aperture parallel light beam; the specific structure of the binary phase plate among the present invention is shown in Figure 2 (a) shown.

[0047]The first Fourier lens 4 is arranged at the rear end of the ...

Embodiment 2

[0062] The optical path of this embodiment is the same as that of Embodiment 1, the difference is that the binary phase plate used in this embodiment is used to generate a square array, and the specific differences are as follows:

[0063] The binary phase plate in this embodiment is etched on the substrate to produce a plurality of grid structures. All the grid structures are divided into two types. The grayscale of the two triangles is greater than the grayscale of the left and right triangles; the other kind of grid structure is also divided into four isosceles right triangles, and the grayscale of the upper and lower triangles is smaller than the grayscale of the left and right triangles; the two grid structures Alternately distributed vertically and horizontally, finally forming a rectangular array.

[0064] Figure 2(a2) is a binary phase plate used to produce a square array. When the difference between the phase modulation of two kinds of grids with different gray levels...

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Abstract

The invention discloses a device and method for generating a spatial spiral beam array by using a periodic binary phase plate, comprising: a laser light source; a beam expander collimator, used to convert the light from the light source into a large-diameter parallel beam; The phase plate is used to modulate the wavefront of the light field of the large-aperture parallel beam; the first Fourier lens is the spectrum of the light field after passing through the binary phase plate at the first Fourier lens; the filter allows the central spot Passing through, while allowing several symmetrical spots close to the central spot to pass through, and phase-modulate several symmetrical spots; the second Fourier lens converts the phase-modulated symmetrical spots into symmetrical ones with the same axial wave The parallel beams of the vector, the parallel beams interfere, and generate an array of vortex beams; at the same time, the second Fourier lens converts the central spot of the spatial spectrum into a parallel beam that travels along the optical axis, and this beam will interfere with the vortex beam array , resulting in a spatially helical beam array.

Description

technical field [0001] The invention discloses a method and a device for generating a spatial spiral beam array by using a periodic binary phase plate. Background technique [0002] Space spiral beam is a beam with special light intensity distribution in space, and its intensity distribution is distributed along the optical axis in a spiral structure. It has certain application value in the fields of material processing, particle manipulation, particle shunting, and optical communication. [0003] At present, the method of multi-beam interference can generate array vortex beams with a certain regular arrangement, and an additional axially parallel beam and array vortex beam interference can generate a spatial helical beam array. In the past, there were some problems in the method of using liquid crystal spatial light modulators to generate spatial spiral beams. For example, the energy utilization rate of liquid crystal spatial light modulators was not high, and the pixel siz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09
CPCG02B27/0938G02B27/0955G02B27/0988
Inventor 韩玉晶张莉荣振宇陈小艺
Owner UNIV OF JINAN