涡旋偶极子高斯光束在海洋湍流中的传输特性

Propagation of gaussian beam with a pair of vortices in the oceanic turbulence

在考虑湍流特性之后,本文对线偏振涡旋偶极子高斯光束在海洋中的传输进行了研究.研究获得的结果显示,随着海洋均方温度耗散率XT的增大,从而引起光束在海洋湍流中传输后的相干长度p0的减小,使得涡旋偶极子在传输过程中旋转角度未达到90度既已出现湮灭,光强分布最终演变为高斯分布.由于海洋湍流的影响,入射完全相干涡旋偶极子光束在传输过程中演变为部分相干光束,相干度在传输截面上的分布在传输过程中也出现旋转,且顺时针旋转的速度与双涡旋结构旋转的速度一致,并最终演变为纵向三瓣结构.

The propagation properties of the Gaussian beam with a pair of vortices in the ocean have been investigated after considering the turbulent properties.The numerical results show that the oceanic turbulence can affect the spectral intensity distribution and spectral degree of coherence.With the increase of the rate of dissipation of mean-square temperature XT the vortices annihilate in the propagation,and finally the spectral intensity distribution change into Gaussian type.Under the effect of the oceanic turbulence,coherent Gaussian beam with a pair of vortices evolve into partially coherent beam.Moreover,the spectral degree of coherence rotate synchronistically with the optical vortex dipole,and change into longitudinal trivalvular structure ultimately.