Phase discontinuities induced scintillation enhancement: coherent vortex beams propagating through weak oceanic turbulence

被引:0
作者
Wang, Hantao [1 ]
Zhang, Huajun [1 ]
Ren, Mingyuan [1 ]
Yao, Jinren [1 ]
Zhang, Yu [1 ]
机构
[1] Harbin Inst Technol, Sch Phys, Harbin, Peoples R China
关键词
Scintillation; phase dislocation; vortex beam; oceanic turbulence; phase screen simulation; weak perturbation; OPTICAL VORTEX; ANGULAR-MOMENTUM; LASER-BEAM; DISLOCATIONS; EVOLUTION; VORTICES; BEHAVIOR;
D O I
10.1080/17455030.2021.2012300
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Under the impact of an infinitely extended edge phase dislocation, optical vortices (screw phase dislocations) with tight spacing induce scintillation enhancement. As the simplest case, the scintillation index of an interfering beam consisting of two Gaussian vortex beams with +/- 1 topological charges through weak oceanic turbulence is researched via derivation and phase screen simulation to present this phenomenon. Different combinations of two types of phase discontinuities can be obtained by changing the overlapping degree and the phase difference of two coherent Gaussian vortex beams. The scintillation indexes for them verify that the formation condition of the phenomenon is the coexistence of two types of phase discontinuities. And the enhanced scintillation index can be several orders of magnitude larger than that of a plane wave under weak perturbation (Rytov variance). This phenomenon could be useful for both optical vortex detection and perturbation measurement.
引用
收藏
页码:5722 / 5738
页数:17
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