Measuring device and method for topological charge value of perfect vortex beam based on light intensity analysis

Abstract

Provided are a perfect vortex light beam topological load measurer and method based on light intensity analysis, relating to the particle optical control and optical test field. The measurer comprises a continuous wave (CW) laser; a pin hole filter is provided in the forwarding direction of the light beam emitted by the CW laser; a convex lens I, an aperture diaphragm I, a polarizer and a reflection type spatial light modulator are successively arranged in the forwarding direction of the light beam after the pin hole filter; in the forwarding direction of the light beam generated after reflection of the reflection type spatial light modulator, a polarization analyzer, an aperture diaphragm II, a convex lens II and a CCD camera are successively provided; through phase compensation, the diffraction positive and negative first order generated by black grids in the spatial light modulator interferes imaging in the CCD camera, and interference fringe images are transmitted to the computer for treatment. The measurer and method do not need to perform beam splitting on light, omit external interference optical elements, simplify an optical path, and realize integer order vortex light beam topological load measurement, and have the advantages of concise principle, low cost, real-time on-line parameter adjustment, easy operation, etc.

Description

technical field [0001] The invention relates to the field of particle light manipulation and optical testing, in particular to a measuring device and method for measuring the topological charge value of a perfect vortex beam based on light intensity analysis. Background technique [0002] Perfect vortex beams have a wide range of applications in the excitation of orbital angular momentum modes in magnetic ring fibers, optical trapping, manipulation of tiny particles, optical tweezers, and optical wrenches. In 2013, Andrey S.Ostrovsky and others proposed the concept of perfect vortex, the radius of the bright ring of the vortex beam does not depend on the topological charge value [Opt.Lett.38,534,2013], but this method will be Generates additional stray aura. In 2015, Pravin Vaity et al obtained integer-order perfect vortices without additional halos by Fourier transforming Bessel-Gaussian beams [Opt.Lett., 40, 597, 2015]. The topological charge of vortex beams carries opti...

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Problems solved by technology

In 2013, Andrey S.Ostrovsky and others proposed the concept of perfect vortex, the radius of the bright ring of the vortex beam does not depend on the topological charge value [Opt.Lett.38,534,2013], but this method will be Generates additional stray aura

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