Analysis To The Diffraction Characteristics Of Optical Vortex Dipole

Because of complexity and huge application prospect, optical vortex and vortex beambecome a very hot research topic in recent years’ academics. The reason why the vortex beam isso popular, especially the great advantages in the fields such as optical micro manipulation, ismainly owning to the optical vortex ring.The optical vortex ring can be focused from circularoptical trap.With the laser and the formation of the deepening of research, people gradually understandvortex beam. Optical vortex is a kind of special optical field with a unique phase structure. It isalso a very important branch of modern optics. In recent years, optical vortex has a very widerange of applications, such as in optoelectronics, communications, materials science, quantuminformation processing and application of quantum optics and other fields. Starting from thedevelopment background of vortex beam, this paper introduces the nature of vortex beam oflight intensity and transport properties, gives a mathematical description of vortex beam,describes the principle of dipole vortex beamin detail, and introduces the dipole vortex beamtransmission characteristics.This paper discusses the development and situation of optical vortex over the pastdecades in our country and abroad at first. In the following part, it makes an analysis of thecharacteristics of the vortex beam, discusses the method, its mathematical expression andintensity distribution characteristics, and studies the characteristics of the angular momentumand the vortex in the light propagation characteristics and laws, and then studies the relationshipand difference between optical vortex, respectively. After the dual pole contrasted the beampropagation, the paper finally studies the optical vortex dipole limited by diffraction opticaltransmission characteristics of the system. As a limited diffraction optical system is equivalentto the limited aperture diffraction, we can start from aperture optical vortex on the diffraction ofdipole and study the optical dipole eddied by optical transmission characteristics of the system.The methods of this paper are based on the Fresnel diffraction integral, the calculation ofoptical dipole eddies that exist in a gaussian beam by a quarter of the screen of the diffraction pattern, the optical vortex evolution characteristics of dipole in the diffraction field. Comparedwith literature research, this paper deepens the optical dipole eddies in the understanding of thecharacteristics of the diffraction field.First of all, this introduces the development history and status quo of optical vortex,further studies on the optical vortex, makes people study and improve the relevant knowledgeand technology, as well as serve for people in a better way.Secondly, it briefly introduces the basic theories of optical vortex. In the beginning, itdescribes the characteristics of the optical vortex, and then uses mathematical operations inorder to make a clear description of the optical vortex, and briefly introduces several kinds ofcommon vortex. At the same time, the angular momentum of optical vortex is derived andstudied. Finally, it introduces the optical propagation theories of vortex under differentconditions. All the above deepen the understanding of the basic theory of optical vortex, laysthe groundwork for the further study of the optical vortex in the following parts.Thirdly, the third part describes the energy distribution characteristics of the noncoherentdipole ont on cross section, introduces the characteristics and transmission of the noncoherentdipole beam spot. Then under the condition of paraxial light beam transmission theory, thispaper derives the dipole vortex beam transmission electric field expressions of beam after acertain distance, so as to make a better understanding in the observation of plane distribution.Fourthly, this part shows two kinds of expressions of optical vortex. Starting from theanalysis of the nonlinear schrodinger equation, the fourth part analyses the optical vortex in thegaussian linear diffraction characteristics of the medium as a background. Further thediffraction characteristics of array of optical vortex is analyzed. It is found that, in the processof diffraction, because of optical vortex interaction, some primitives take annihilation. However,light field around the core of primitive will degenerate primitives, eventually form into a newoptical vortex arrays.