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Method of generating Mathieu beam based on film amplitude modulation and cone mirror phase modulation

A technology of amplitude modulation and phase modulation, applied in optics, optical components, instruments, etc., can solve the problem of low utilization rate of light energy, and achieve high utilization rate of light energy and the effect of precise generation

Active Publication Date: 2018-09-28
ZHEJIANG NORMAL UNIVERSITY
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Problems solved by technology

But because the Durnin device can only use a small amount of light energy transmitted through the ring to generate Mathieu beams, the utilization rate of light energy is low

Method used

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  • Method of generating Mathieu beam based on film amplitude modulation and cone mirror phase modulation
  • Method of generating Mathieu beam based on film amplitude modulation and cone mirror phase modulation
  • Method of generating Mathieu beam based on film amplitude modulation and cone mirror phase modulation

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] figure 1 It is the experimental device figure of the present invention to produce Mathieu beam precisely by film amplitude modulation and axicon phase modulation, experimental device comprises: laser beam (1), beam expander collimation system (2,3), film (4), axicon ( 5), scientific CCD camera (6).

[0038] The experiment implementation process is as follows:

[0039] 1. Through the calculation of the angular Mathieu function, the amplitude distribution diagram with the angular Mathieu function is obtained, and the film (4) with the amplitude distribution diagram is produced. The specific production steps of the film (4): through the angular Mathieu function, calculate the amplitude distribution grayscale image with the angular Mathieu function; reverse the color of the grayscale image from black to white; use the film output device to reverse ...

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Abstract

A method of generating a Mathieu beam based on film amplitude modulation and cone mirror phase modulation is a method for accurately and efficiently generating a cluster of non-diffracting Mathieu beams. The method is based on the definition of the angular Mathieu function. Firstly, the grayscale image of the amplitude distribution with the angular Mathieu function distribution is constructed. Then, the grayscale image is subjected to black and white color inversion, and is printed on a high-resolution film by a film output instrument. After exposure of the printed film, an amplitude modulatedfilm with the angular Mathieu function distribution is obtained. The produced film is placed close to the entrance pupil surface of a cone mirror, incident parallel beams are modulated in terms of amplitude and phase via the film and the cone mirror respectively, and then the Mathieu beam is generated after the cone mirror. The experimental device of the invention has simple structure and can easily and accurately generate the Mathieu beam.

Description

technical field [0001] The invention relates to the generation, control and conversion technology of structured light beams, and is a method for accurately generating Mathieu light beams by using a film and an axicon. Background technique [0002] Many scientific experiments, such as the interaction of light with matter, require beams of light that are stable and unchanging in shape. But diffraction is the most common optical phenomenon. Diffraction effects during beam transmission lead to beam broadening and deformation. In order to overcome the diffraction of light waves, the non-diffraction structured beams introduced and produced in recent years are an important means to construct and transmit invariant beams. A non-diffractive structured beam is a special solution to the wave equation. A common feature of this type of beam is that the beam distribution has nothing to do with the transmission distance. Therefore, non-diffracting structured light beams can play a speci...

Claims

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Application Information

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IPC IPC(8): G02B27/09
CPCG02B27/0938
Inventor 任志君吴琼刘士阳
Owner ZHEJIANG NORMAL UNIVERSITY
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