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 
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Excitation of High-Order Optical Vortex Modes by Tilting Tapered and Lensed Single Mode Fiber
图 & 表
图 1. 支持二阶模式的环形芯光纤。(a)环形芯光纤的结构和折射率分布图;(b)环形芯光纤中LP01,LP11,LP21和LP02模的归一化场强分布图
Fig. 1. Annular-core fiber supporting second-order mode. (a) Structure and refractive index profile of annular-core fiber; (b) normalized field intensity profiles of LP01, LP11, LP21, and LP02 modes in annular-core fiber
图 2. 错位倾斜激发参数说明。(a)倾斜角度φ;(b)错位距离m及光纤之间的水平距离d
Fig. 2. Description of offset and tilt parameters. (a) φ represents tilt angle; (b) m represents offset distance and d represents horizontal distance between fibers
图 3. 锥形微透镜SMF的仿真结果。(a)耦合效率随光纤之间的水平距离的变化趋势;(b)光在锥形微透镜SMF和自由空间中传播期间的模场直径变化(插图为归一化模场强度的变化)
Fig. 3. Simulation results of tapered and lensed SMF. (a) Trend of coupling efficiency varies with horizontal distance between fibers; (b) variation of mode field diameter during propagation of beam in tapered and lensed SMF and free space (illustration shows variation of normalized mode field intensity)
图 4. 不同倾斜角度的仿真结果。(a) LP01,LP11,LP21和LP02模的纯度随倾斜角度的变化;(b)总模式耦合效率随倾斜角度变化
Fig. 4. Simulation results under different tilt angles. (a) Purities of LP01, LP11, LP21, and LP02 modes vary with tilt angle; (b) total mode coupling efficiency varies with tilt angle
图 5. 不同错位距离的仿真结果。(a)倾斜角度为8°时,LP01,LP11,LP21和LP02模的纯度随错位距离变化的曲线;(b)倾斜角度为8°时,总的模式耦合效率随错位距离的变化曲线
Fig. 5. Simulation results under different offset distances. (a) Purities of LP01, LP11, LP21, and LP02 modes vary with offset distance when tilt angle is 8°; (b) total mode coupling efficiency varies with offset distance when tilt angle is 8°
图 6. 在环形芯光纤中倾斜错位激发二阶OAM模式的实验装置图(左下角插图为环形芯光纤端面)
Fig. 6. Experimental setup to generate second-order OAM mode in annular-core fiber by adding tilt angle (illustration in bottom left corner is end face of annular-core fiber)
图 7. 模式的强度分布图。(a) LP01模,倾斜角度为0°;(b) LP11模,倾斜角度为5°;(c)低纯度LP21模,倾斜角度为6.5°;(d)高纯度LP21模,倾斜角度为8°;(e) LP02模式,倾斜角度为10°
Fig. 7. Intensity patterns of modes. (a) LP01 mode when tilt angle is 0°; (b) LP11 mode when tilt angle is 5°; (c) LP21 mode with low purity when tilt angle is 6.5°; (d) LP21 mode with high purity when tilt angle is 8°; (e) LP02 mode when tilt angle is 10°
图 8. 二阶OAM模式的强度分布图及其干涉图。(a)当倾斜角度为8°且错位距离为2 μm时,激发出的二阶OAM模式的强度分布图;(b) L=+2时的干涉图案;(c) L=-2时的干涉图案
Fig. 8. Intensity pattern and interference patterns of second order OAM mode. (a) Intensity pattern of excited second-order OAM mode when tilt angle is 8° and offset distance is 2 μm; (b) interference pattern with L=+2; (c) interference pattern with L=-2
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.
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