中国激光, 2019, 46 (9): 0906001, 网络出版: 2019-09-10
倾斜锥形微透镜单模光纤激发高阶涡旋光模式 下载: 1070次
Excitation of High-Order Optical Vortex Modes by Tilting Tapered and Lensed Single Mode Fiber
光纤光学 涡旋光 锥形微透镜单模光纤 环形芯光纤 轨道角动量 fiber optics vortex beams tapered and lensed single mode fiber annular-core fiber orbital angular momentum
摘要
提出了一种在环形芯光纤中激发高阶涡旋光模式的方法,通过控制锥形微透镜单模光纤与环形芯光纤之间的倾斜角度和错位距离,实现了高阶涡旋光模式的激发。由数值模拟与实验测试结果可知,倾斜角度和错位距离分别约为8°和2 μm时,高质量的二阶涡旋光模式被激发。此外,由于锥形微透镜光纤具有聚焦光束的特性,其倾斜错位激发可以提高光的耦合效率,该方法与使用普通单模光纤的错位激发法相比,光的耦合效率提高13%左右。激发出的高阶涡旋光模式在高分辨率显微镜、光学微观操纵和光学传感等应用领域中具有巨大的应用潜力。
Abstract
A method for exciting high-order optical vortex modes in an annular-core fiber is proposed. The method involves controlling the tilt angle and the offset distance between the tapered and lensed single mode fiber (SMF) and the annular-core fiber. Numerical simulation and experimental verification results show that the excitation of the high quality second-order optical vortex mode can be realized by optimizing the tilt angle and the offset distance to approximately 8° and 2 μm, respectively. This tilted offset excitation method based on a tapered and lensed SMF can improve the coupling efficiency because of the focusing effect of the tapered and lensed SMF. Compared with excitation by a standard SMF, an enhancement in the coupling efficiency of approximately 13% is found by using the tapered and lensed SMF. The excited high-order optical vortex modes show considerable potential for high-resolution microscopy, optical micromanipulation, optical sensing, etc.
宋巍, 刘奂奂, 庞拂飞, 杨俊锋, 张春香, 文建湘, 商娅娜, 黄素娟, 陈娜, 曾祥龙, 王廷云. 倾斜锥形微透镜单模光纤激发高阶涡旋光模式[J]. 中国激光, 2019, 46(9): 0906001. Song Wei, Liu Huanhuan, Pang Fufei, Yang Junfeng, Zhang Chunxiang, Wen Jianxiang, Shang Yana, Huang Sujuan, Chen Na, Zeng Xianglong, Wang Tingyun. Excitation of High-Order Optical Vortex Modes by Tilting Tapered and Lensed Single Mode Fiber[J]. Chinese Journal of Lasers, 2019, 46(9): 0906001.