广义双曲正弦-高斯光束的Gyrator变换性质和暗空心光束产生  

Gyrator transform of generalized sinh-Gaussian beam and generation of dark hollow light beam with vortex

作　　者：朱开成[1] 唐慧琴[1] 郑小娟[1] 唐英[1] 

机构地区：[1]中南大学物理与电子学院,超微结构与超快过程湖南省重点实验室,长沙410083

出　　处：《物理学报》2014年第10期179-184,共6页Acta Physica Sinica

摘　　要：基于Gyrator变换,推导了广义双曲正弦-高斯光束场分布的解析表达式,研究了广义双曲正弦-高斯光束在Gyrator变换平面上的光强分布和相位特性.结果表明,在Gyrator变换过程中,具有边缘位错相位特性的双曲正弦-高斯光束能转换为具有涡旋的暗空心光束,并确定产生的暗空心光束的拓扑荷指数为一,而不具有边缘位错相位特性的双曲余弦-高斯光束则不可能出现空心结构.对影响变换场强度和相位分布的束结构参数及系统参数进行了分析讨论.Starting from the Gyrator trnasform formula, the closed-form filed distribution of generalized sinh-Gaussian beam passing through such a transform system is derived, and the intensity distribution and the corresponding phase distribution associated with the transforming generalized sinh-Gaussian beams are analyzed. Based on the numerical method, the distributions are graphically drawn and it is found that, for appropriate beam parameters and by carefully adjusting the transform angle of Gyrator transform, the dark hollow beam with topological charge index being unity can be realized with sinh-Gaussian beam carrying an edge dislocation. And the influences of the beam parameters and the transform angle on the formation of perfect dark hollow beams are analyzed. However, it is impossible to obtain dark hollow beam with Gyrator transforming cosh-Gaussian beam.

关 键 词：广义双曲正弦-高斯光束 Gyrator变换 暗空心光束 相位奇异性 

分 类 号：O436[机械工程—光学工程]