A polygonal partially coherent vortex beam generating system and method

Abstract

The invention relates to the technical field of optics, and discloses a polygonal partially coherent vortex beam generating system and method, comprising a computer, a laser, a collimating beam expanding element, a first lens, a beam dispersing element and a second lens sequentially arranged along an optical path , a Gaussian filter, a spatial light modulator, a third lens, the spatial light modulator is connected to a computer, and the computer is used to load the hologram of the anomalous power exponential vortex beam to the spatial light modulator. The present invention can flexibly adjust the geometric structure of the partial coherent vortex beam in real time, and the present invention can simply and conveniently generate the polygonal partial coherent vortex beam, so it has important application value in the field of particle manipulation. Further, the light intensity distribution of ellipse, triangle, quadrilateral and pentagram can be realized by adjusting the values ​​of the power exponent factor and the helical factor. Compared with the traditional partially coherent vortex beam, its light intensity distribution has a higher degree of control freedom and retains a higher energy.

Description

technical field [0001] The invention relates to the technical field of optics, and in particular, to a system and method for generating a polygonal partially coherent vortex beam. Background technique [0002] Vortex beams are special beams with dark hollow structures. In recent years, they carry orbital angular momentum and have important applications in particle manipulation, optical tweezers, optical communications, optical measurements, and super-resolution imaging. Therefore, it has gradually attracted the attention of researchers. With the increasing development of science and technology, researchers need to construct a variety of vortex beams to meet the special needs of these application fields. The control parameters of vortex beams mainly include amplitude, phase, polarization, frequency and coherence. A major feature of lasers is that they have high coherence. However, after passing through atmospheric turbulence, random phase, or rotating scatterers, the cohere...

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Problems solved by technology

[0006] In summary, the existing fractional vortex phase schemes can only realize partially coherent vortex beams with gaps, and the control degree of freedom of light intensity distribution is not high.

However, the method of controlling the correlation structure requires the use of a spatial light modulator in front of the dynamic scatterer to control the correlation function, resulting in excessive energy loss, making it difficult to apply to optical tweezers and other fields that require high-energy beams.

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