A Method of Using Artificial Microstructure to Control the Coherence of Beam

Abstract

The invention discloses a method for regulating the coherence of light beams by using artificial microstructures. The method includes the steps of: S10, determining the phases at the positions of cells corresponding to the artificial microstructure area according to the coherence of partially coherent light to be generated; S20 , calculating the rotation angle of the nano-cells arranged at each cell position; S30, arranging the nano-cells with different rotation angles at the corresponding cell positions, and constructing an artificial micro-cell for realizing beam coherence regulation Structure; S40, inject the focused light beam onto the surface of the constructed artificial microstructure, select the incident area of ​​the artificial microstructure according to requirements, and obtain a partially coherent light beam with a corresponding degree of coherence. The present invention can avoid the noise of light field regulation, improve the utilization rate of energy, and realize precise modulation of light field coherence; the structure constructed by nano-cells can greatly reduce the size of the structure, which is beneficial to the optical system miniaturization design.

Description

technical field [0001] The invention relates to the technical field of coherent optics, in particular to a method for regulating the coherence of light beams by using artificial microstructures. Background technique [0002] As an important branch of modern optics, coherent optics has attracted the attention of a large number of researchers at home and abroad. Coherence actually represents the result of the correlation between some quantities of two points in the fluctuating light field, and this correlation can be measured by the fringe contrast of Young's double-slit interference. Coherence is an important characteristic of the light field, and it is of great significance to the study of the coherence regulation of the light field. It has been found that the coherence regulation of the light field is widely used in free space optical communication, lidar, laser nuclear fusion, special optical imaging, quantum optics, etc. It has important application value in the field. ...

AI Technical Summary

Problems solved by technology

At present, artificial microstructures have been able to effectively control the amplitude, phase and polarization state of the light field at the sub-wavelength scale, which has high application value, such as realizing polarized optical anti-counterfeiting, achromatic lenses, high-saturation structural colors, etc. , and so far, artificial microstructures have rarely been involved in the regulation of the coherence dimension of the light field.

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