摘要
数值模拟了拉盖尔-高斯涡旋光束在湍流大气中传输时的光强分布和光学涡旋的漂移。由模拟结果可知,当涡旋光束在湍流大气中传输时,光强分布由最初的环形结构变为平顶结构,最终在远场演化为高斯分布;光强廓线的演变过程与传输距离、湍流强度、湍流外尺度、涡旋光束拓扑荷数、束腰宽度以及光波长有关,与湍流内尺度无关。光学涡旋在接收面的不同位置处出现的频次满足高斯分布;随着传输距离的增加、湍流的增强或涡旋光束拓扑荷数的增加,光学涡旋的漂移范围增大且在不同位置处出现的频次偏离高斯分布;适当选择涡旋光束的束腰宽度会减小光学涡旋的漂移。
The intensity distribution and the wander of optical vortices of Laguerre-Gaussian beams propagating in turbulent atmosphere are simulated numerically. The results indicate that intensity profiles of vortex beams experienced successive variation from annular structures to flattened-top profiles and finally to Gaussian profiles with the propagation. The variation is closely related with the propagation distance, the turbulence strength, the outer scale of turbulence, the number of topological charge, the width of beam waist and the wavelength of vortex beam. However, the variation is nothing to do with the inner scale of turbulence. The wandering behavior of optical vortices in the atmosphere is described by the occurrence number on a transverse plane. The results show that the occurrence number on the receiver plane follows Gaussian statistics. As the propagation distance, the turbulence strength, or the topological charge of the vortex beam increases, the Gaussian fitting curves become broader, and the statistics of vortex position tends to random distribution. In addition, choosing the suitable width of the vortex beam waist can reduce the wander of optical vortices.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2016年第10期422-430,共9页
Acta Optica Sinica
基金
国家自然科学基金(11474186
11304184)
山东省自然科学基金(ZR2013FM007)
山东省高等学校科技计划(J13LN28)
关键词
物理光学
大气光学
光强分布
光学涡旋漂移
数值模拟
涡旋光束
physical optics
atmospheric optics
intensity distribution
optical vortex wander
numerical simulation
vortex beam
