反常涡旋光束锥形折射特性分析  

Analysis of conical refraction characteristics of anomalous vortex beam

作　　者：王谦 刘雁[1] 李亚莎[2] 范纹彤 周军[3] 丁福康 欧洺余 石小涛[4] WANG Qian;LIU Yan;LI Yasha;FAN Wentong;ZHOU Jun;DING FukangOU Mingyu;SHI Xiantao(College of Science,Three Gorges University,Yichang Hubei 443002,China;College of Electrical Engineering&New Energy,Three Gorges University,Yichang Hubei 443002,China;Shanghai Key Laboratory of All Solid-state Laser and Applied Techniques,Shanghai 201800,China;Engineering Research Center of Eco-environment in Three Gorges Reservior Region,ThreeGorges University,Yichang Hubei 443002,China)

机构地区：[1]三峡大学理学院,宜昌443002 [2]三峡大学电气与新能源学院,宜昌443002 [3]上海市全固态激光器与应用技术重点实验室,上海201800 [4]三峡大学三峡库区生态环境教育部工程研究中心,宜昌443002

出　　处：《激光杂志》2020年第1期60-64,共5页Laser Journal

基　　金：上海市全固态激光器与应用技术重点实验室开放基金(No.2013ADL02);国家自然基金(No.51577105);三峡库区生态环境教育部工程研究中心基金(No.2015KF-13);湖北省自然科学基金(No.2014CFB671)

摘　　要：为了分析反常涡旋光束的锥形折射,利用锥形折射衍射理论,给出了反常涡旋光束通过双轴晶体光场的表达式。通过数值模拟,分析了锥形折射的环半径和光束束腰半径的比值、光束阶数、拓扑荷数和传播距离等参数对传输特性的影响。结果表明:当锥形折射的环半径远大于光束束腰半径时,在焦像面处,反常涡旋光束的锥形折射光场与高斯光束的双环结构不同,其光场是多环结构;随着拓扑荷数的增加,在焦像面处的亮环数也会增加;光场进一步传输时,光场从多环结构转换成双环结构,且内外环结构特征也会发生变化。In order to analyze the conical refraction of the anomalous vortex beam,the expression of the light field of the vortex beam passing through the biaxial crystal is given by using the conical refraction diffraction theory. Through numerical simulation,the effects of the ratio of ring radius and beam waist radius,beam order,topological charge number and propagation distance on the propagation characteristics are investigated. The results show that the light field of the anomalous vortex beam is different from the double-ring pattern of the Gaussian beam,and the light field is a multi-ring pattern at the focal plane when the ring radius of conical refraction is much larger than the beam waist radius. With the topological change number increasing,the number of bright rings increases at the focal plane. When the light field is propagating further,the field is converted from a poly-cyclic structure into a double-ring structure,the internal and external ring structure will change as well.

关 键 词：反常涡旋光束 双轴晶体 锥形折射 拓扑荷数 

分 类 号：TN248[电子电信—物理电子学]