All-Fiber Vortex Laser Generated With Few-Mode Long-Period Gratings

被引：35

作者：

Zhao, Yunhe ^{[1
]}

Wang, Tianxing ^{[1
]}

Mou, Chengbo ^{[1
]}

Yan, Zhijun ^{[2
]}

Liu, Yunqi ^{[1
]}

Wang, Tingyun ^{[1
]}

机构：

[1] Shanghai Univ, Shanghai Inst Adv Commun & Data Sci, Key Lab Specialty Fiber Opt & Opt Access Networks, Sch Commun & Informat Engn, Shanghai 200072, Peoples R China

[2] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China

来源：

IEEE PHOTONICS TECHNOLOGY LETTERS | 2018年 / 30卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Optical fiber lasers; optical vortices; long-period gratings; ORBITAL-ANGULAR-MOMENTUM; LIGHT; BEAMS; WRITTEN; ANGLE;

D O I：

10.1109/LPT.2018.2815041

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We report a simple method for generating optical vortex beams (OVB) from an all-fiber laser. An intracavity mode converter based on few-mode fiber long-period gratings was used to enable the OVB operation. The intensity profiles and the wavefront helicity of the output laser beams were characterized by analyzing the spatial intensity profiles of the laser emission and its self-interference. Selection of the wavefront handedness can be achieved simply by adjusting the intracavity polarization controller. The laser achieved similar to 50 mW of output power for both first-order and second-order vortex modes generation with the corresponding slope efficiencies of 8.12% and 7.91%, respectively. The corresponding mode conversion efficiency of 98% and 99.5% are for the LP11 mode and LP21 mode, individually. The linearly polarized orbital angular momentum beams with l = +/- 1 were characterized experimentally by adjusting a polarizer at the laser output.

引用

页码：752 / 755

页数：4

共 31 条

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