System and method for generating non-diffraction vector Bezier optical field

Abstract

The invention discloses a system for generating a non-diffraction vector Bezier optical field. The system comprises a light source, a beam expansion collimator, a polarization converter, a focusing lens group and a metal round disc, wherein the light source is used for generating linear polarization laser, the beam expansion collimator is used for performing beam expansion and collimation on the linear polarization laser emitted from the light source, the polarization converter is used for converting the linear polarization laser after beam expansion to a vector optical field with non-uniformspace distribution, the focusing lens group is used for focusing the vector optical field, adjusting a focal spot of the vector optical field and generating a vector Laguerre-Gauss optical field, themetal round disc is used for absorbing a central part of the vector Laguerre-Gauss optical field, higher-order frequency spectrum components are induced due to a sharp-edge vector diffraction effect,and the non-diffraction vector Bezier optical field is generated by coherence stack of the high-order spectrum components. The higher-order spectrum components are induced by the sharp-edge vector diffraction effect, the Bezier optical field is generated by the coherence stack of the higher-order spectrum components which are circularly and symmetrically distributed, and the generated optical field has the characteristics of non-diffraction transmission and self-healing.

Description

technical field [0001] The invention relates to the technical field of Bessel light field generation, in particular to a system and method for generating a non-diffraction vector Bessel light field. Background technique [0002] Diffraction is a common physical phenomenon. A spatially confined monochromatic laser beam becomes diffracted and divergent after propagating the Rayleigh distance in free space. However, in 1987, Durnin et al. from the University of Rochester in the United States obtained the analytical solution of the zero-order Bessel function from the free space scalar wave equation, and proved that the solution has non-diffraction propagation characteristics in experiments, thus proposing the non-diffraction Bessel function for the first time The concept of light field. The characteristic of this light field is that the central spot is very small, and its light field distribution is consistent in any plane perpendicular to the propagation direction, that is, th...

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Problems solved by technology

However, the non-diffraction Bessel light field mentioned above does not involve the vector characteristics of the light field, and there are few researches on the non-diffraction vector Bessel light field.

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