空心高斯涡旋光束的远场特性  

Characteristics of hollow Gaussian vortex beams in the far field

作　　者：唐碧华[1] 罗亚梅[1] 贺兵[1] 郑尚彬[1] 

机构地区：[1]泸州医学院生物医学工程系,四川泸州646000

出　　处：《强激光与粒子束》2013年第10期2571-2576,共6页High Power Laser and Particle Beams

基　　金：四川省教育厅自然科学基金项目(10ZB029)

摘　　要：基于角谱法和稳相法,推导出了空心高斯涡旋光束的TE波和TM波在自由空间远场传输和能流密度的解析表达式,研究了其相位奇点和能流密度分布。结果表明,空心高斯涡旋光束的远场特性主要跟控制参数有关。改变光束中的涡旋离轴量,光涡旋和能流密度黑核会发生移动。圆刃型位错线的半径和能流密度暗环位置跟束腰宽度有关,而能流密度的对称性主要受涡旋离轴量的影响。Based on the methods of vector angular spectrum and stationary phase, the analytical expressions of the TE and TM terms and the energy flux distributions of hollow Gaussian vortex beams in the far field are derived and used to analyze the phase singularities and energy flux distributions. It is shown that the far field characteristics of hollow Gaussian vortex beams de- pend on the control parameters. By varying the off-axis distance, both the optical vortex and the black nucleus in energy flux dis- tributions will move. The radius of the circular edge dislocation and the dark ring position are related to the waist width, however the symmetrical spatial distribution of energy flux distributions is mainly affected by the off-axis distance.

关 键 词：空心高斯涡旋光束 角谱法 相位奇点 能流密度 黑核 

分 类 号：O436[机械工程—光学工程]