光子学报, 2014, 43 (3): 0326001, 网络出版: 2014-04-09
利用柱透镜调控涡旋光束的拓扑结构
Topological Transformation of Vortex Beams Using Cylindrical Lens
摘要
提出了一种利用柱透镜调控涡旋光束拓扑结构的方法.利用计算全息法制作的叉形光栅掩模板,实验获得了具有不同拓扑荷的涡旋光束,分析了涡旋光束通过柱透镜变换后的强度和相位分布.结果表明,涡旋光束经柱透镜变换后,其拓扑荷符号将发生改变,并且高阶涡旋光束退化为多个分离的一阶涡旋光束.利用高阶激光模式的线性叠加特性以及古依相移对实验结果进行了理论解释,并通过数值模拟对实验结果进行了验证.
Abstract
The topological transformation of vortex beams using cylindrical lens is experimentally and numerically demonstrated. The intensity distributions and phase structures of vortex beams with different topological charges were analyzed after the transformation by a cylindrical lens, which were generated using the computing generated holographic method. The results show that the transformation of the cylindrical lens results in the sign change of the topological charges of the vortex beams. In addition, the higher order vortex beams decay into a beam with multiple singularities with charge-one. These observations were analyzed based on the linear superposition of higher order laser modes and Gouy phase delay. Finally, the experiment results were verified by the numerical simulations.
方亮, 甘雪涛, 赵建林. 利用柱透镜调控涡旋光束的拓扑结构[J]. 光子学报, 2014, 43(3): 0326001. FANG Liang, GAN Xue-tao, ZHAO Jian-lin. Topological Transformation of Vortex Beams Using Cylindrical Lens[J]. ACTA PHOTONICA SINICA, 2014, 43(3): 0326001.