Method for regulating and controlling light beam coherence by utilizing artificial microstructure

Abstract

The invention discloses a method for regulating and controlling light beam coherence by utilizing an artificial microstructure. The method comprises the following steps of S10, determining the phase of the to-be-generated partially coherent light at each cellular position of a corresponding artificial microstructure area according to the coherence of the to-be-generated partially coherent light; S20, calculating a rotation angle of the nano cells arranged at each cell position; S30, arranging the nano cells with different rotation angles at corresponding cell positions, and constructing an artificial microstructure for realizing light beam coherence regulation; and S40, enabling the focused light beam to be incident to the surface of the constructed artificial microstructure, selecting anincident region of the artificial microstructure according to requirements, and obtaining a partially coherent light beam with corresponding coherence degree. According to the invention, the noise oflight field regulation can be avoided, the utilization rate of energy is improved, and the accurate modulation of light field coherence is realized; by adopting the structure constructed by the nano cells, the size of the structure can be reduced to a larger extent, and the miniaturization design of an optical system is further facilitated.

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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