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| In this paper, based on two different methods of numerical simulation- Power Spectrum Inversion Method (PSIM) and Zernike Polynomials Method (ZPM), the phase characteristic of Laguerre-Gaussian (LG) beam carrying orbital angular momentum (OAM) propagating through turbulent atmosphere is studied theoretically, the random phase screens to emulate atmosphere turbulence are established, since the phase is the most important property of vortex beam, closely related to the topological charge, phase variation after light propagating through the atmosphere is simulated and analyzed. The research results show that the atmosphere turbulence will deteriorate the property of LG beam, as the atmosphere turbulence increases, the phase profile of LG beam become fuzzier, leading to the spread of topological charge, in addition, the simulation results difference based on PSIM and ZPM have also been studied. |
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| Keywords:Laguerre-Gaussian beam; orbital angular momentum; atmosphere turbulence; phase profile; power spectrum inversion method; Zernike Polynomials method |
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