| With the continuous advancement of science and technology,people's research on classic theories has become more and more thorough,and the scope of practical application of various theories has become more and more extensive.However,with further in-depth research,it has been found that the research and application of classic theory will encounter some bottlenecks after reaching a certain level.In order to break this shackle,some frontier workers proposed to combine quantum theory with contemporary science and technology to form the new discipline of quantum information technology.Light quantum has the advantages of fast propagation speed and large storage capacity,so it has broad application prospects.Quantum correlation imaging,quantum communication,quantum radar,quantum detection,etc.have all shown certain advantages in their field.Orbital angular momentum(Orbital Angular Momentum,OAM),as an important parameter of quantum,has always been a research hotspot.At present,the generation method of orbital angular momentum is relatively mature and can be mass-produced and put into use.However,there is no more convenient and practical method for OAM detection.In addition,in actual application,the beam needs to be transmitted in atmospheric space,Then the impact of the turbulence effect on the OAM beam propagating in the free atmosphere is also an urgent problem to be solved.This paper mainly studies the detection of orbital angular momentum and the related issues of its transmission characteristics in the atmosphere.Based on the interference theory and aperture diffraction theory programming simulation,the orbital angular momentum change law under different interference conditions,different aperture shapes and aperture sizes was studied,and the orbital angle was realized according to the change law of the specific interference diffraction image formed after passing through the interference diffraction plate.Momentum measurement.In order to study the transmission characteristics of the vortex beam,the power spectrum inversion method and the subharmonic low-frequency compensation theory were used to construct a random phase screen to simulate the orbital angular momentum of the vortex light.The turbulence intensity of the beam carrying a single-state orbital angular momentum was studied at different turbulence intensity.And the transmission characteristics such as the change of light intensity and phase distribution under the transmission distance,and the spiral spectrum distribution of topological charge.An experimental platform was built,and the effect of atmospheric turbulence on the orbital angular momentum transmission was verified by using a corroded glass sheet to simulate the turbulence of the medium in the atmosphere.Due to the orthogonality of the orbital angular momentum,the topological charge can be superimposed.The superimposed vortex beam can not only have richer light intensity and phase information,but also be more conducive to long-distance transmission.Therefore,this paper simulates and analyzes various topologies The superposition characteristics under the combination of charge values and the simulation of the propagation of the superposed state beam in the atmosphere were simulated to provide relevant theoretical basis for the subsequent application of quantum detection technology. |
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