摘要
涡旋光场具有螺旋形的波前和相位奇点,光场中的每个光子都携带轨道角动量。其独特的性质使得涡旋光场可以在空间上区分不具有空间相干性的散射光与具有空间相干性的非散射光,从而可以作为系统中的空间滤波器件使用,并且在强散射环境里这种空间滤波效果尤为显著。分析了涡旋光场所具有的空间滤波作用的原理,并介绍了近年来利用涡旋光场在强散射环境中进行空间滤波的研究。设计了使用涡旋光场的水下激光雷达测距实验,从而证明涡旋光场在强散射环境中可以通过其空间滤波作用提高激光雷达水下测距的精度,并且散射越强,这种空间滤波作用对测距精度的提高越明显。
The vortex light field has helically shaped wavefront and phase singularities where each photon carries orbital angular momentum(OAM).Its unique properties allow the vortex light field to spatially distinguish incoherent scattered light from coherent non-scattered light,which thus can therefore be used as a spatial filter element.And in the strong scattering environment,this spatial filtering effect is particularly remarkable.The principle of spatial filtering was analyzed and studies of vortex light field in strong scattering environment were introduced.The underwater lidar ranging experiment using the vortex light field was designed to prove that the vortex light field can improve the accuracy of the underwater lidar through its spatial filtering in strong scattering environment.And with strong scattering,this spatial filtering improves the range accuracy more significantly.
作者
杨苏辉
廖英琦
林学彤
刘欣宇
齐若伊
郝燕
Yang Suhui;Liao Yingqi;Lin Xuetong;Liu Xinyu;Qi Ruoyi;Hao Yan(School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2021年第6期1-7,共7页
Infrared and Laser Engineering
基金
国家自然科学基金(61835001)。
关键词
激光雷达
涡旋光场
水下测距
强散射
lidar
vortex light field
underwater ranging
strong scattering
