超高斯涡旋光束在空间中的传输特性  

Propagation characteristics of super-Gaussian beams with vortex wave-front

作　　者：肖谦裔 张蓉竹[1] 

机构地区：[1]四川大学电子信息学院,成都610064

出　　处：《强激光与粒子束》2014年第12期90-95,共6页High Power Laser and Particle Beams

基　　金：四川省教育厅创新团队资助项目(13TD0048);四川省科技厅支撑计划资助项目(2012FZ0046)

摘　　要：研究了超高斯涡旋光束光强最大值、光斑半径以及环围能量半径等参数随传输距离和拓扑荷数的变化规律,并与高斯涡旋光束做了比较,结果表明:超高斯涡旋光束的光斑半径和环围能量半径随拓扑荷数及传输距离呈近似线性关系;对同一拓扑荷数和传输距离,高斯涡旋光束的能量较超高斯涡旋光束要发散;当拓扑荷数较大时,超高斯涡旋光束的光斑半径比高斯涡旋光束更大。针对光束质量研究了广义光束质量因子随传输距离和拓扑荷数的变化,结果表明传输距离足够远时,拓扑荷数较小的超高斯涡旋光束具有更好的光束质量。The super Gaussian vortex beams generated from spiral phase plates （SPP） with different topological charges are discussed, also the properties of the light intensity distribution like max light intensity, radius of light beams and its encircled en ergy varying with distance and with topological charges are studied and compared, which shows that the radius of light intensity or of encircled energy presents rough linear relationships to the propagation distance and topological charges. More over, the energy of Gaussian vortex beams is always more dispersed than that of super Gaussian vortex beams, while the radius of light intensity of Gaussian vortex beams is smaller than that super charges. The generalized M/2 factor varying with propagation distance Gaussian vortex beams when referring to higher topological and topological charges is also discussed to feature the quali ty of beams, which shows that the super Oaussian beam at a relatively far distance with lower topological charges could have bet ter quality.

关 键 词：涡旋相位板 超高斯光束 光斑半径 广义光束质量因子 

分 类 号：TN241[电子电信—物理电子学]