Polygonal partially coherent vortex beam generation system and method

Abstract

The invention relates to the technical field of optics, and discloses a polygonal partially coherent vortex beam generation system and method. The polygonal partially coherent vortex beam generation system comprises a computer, and a laser, a collimating and beam expanding element, a first lens, a beam scattering element, a second lens, a Gaussian filter, a spatial light modulator and a third lens which are arranged along a light path; the spatial light modulator is connected with the computer, and the computer is used for loading the hologram of the abnormal power exponent vortex beam to the spatial light modulator. According to the invention, the geometric structure of the partially coherent vortex beam can be flexibly regulated and controlled in real time, and the polygonal partially coherent vortex beam can be simply and conveniently generated, so that the system and method has important application value in the field of particle manipulation. Furthermore, elliptic, triangular, quadrilateral and pentagram-shaped light intensity distribution can be realized by regulating and controlling the numerical values of the power exponent factor and the spiral factor. Compared with a traditional partially coherent vortex light beam, light intensity distribution of the polygonal partially coherent vortex beam has a high regulation freedom degree, and high energy is reserved.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a system and method for generating a polygonal partially coherent vortex beam. Background technique [0002] Vortex beams are special beams with a dark hollow structure. In recent years, they have important application values ​​in the fields of particle manipulation, optical tweezers, optical communication, optical measurement and super-resolution imaging because of their orbital angular momentum. Therefore, it has gradually attracted extensive attention of researchers. With the increasing development of science and technology, researchers need to build a variety of vortex beams to meet the special needs of these application fields. The control parameters of vortex beam mainly include amplitude, phase, polarization, frequency and coherence. One of the characteristics of laser is its high coherence. However, after passing through atmospheric turbulence, random phase, or rotatin...

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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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