Femtosecond laser inscribed helical long period fiber grating for exciting orbital angular momentum

被引：18
|
作者：
Chen, Jiayan [1 ,2 ]
Bai, Zhiyong [1 ,2 ]
Zhu, Guoxuan [1 ,2 ]
Liu, Rui [1 ,2 ]
Huang, Churou [1 ,2 ]
Huang, Zheng [1 ,2 ]
Wu, Luping [1 ,2 ]
Liao, Changrui [1 ,2 ]
Wang, Yiping [1 ,2 ]
机构：
[1] Shenzhen Univ, Coll Phys & Optoelect Engn, Key Lab Optoelect Devices & Syst, Minist Educ Guangdong Prov, Shenzhen 518060, Peoples R China
[2] Shenzhen Univ, Guangdong & Hong Kong Joint Res Ctr Opt Fibre Sen, Shenzhen Key Lab Photon Devices & Sensing Syst In, Shenzhen 518060, Peoples R China
来源：
OPTICS EXPRESS | 2022年 / 30卷 / 03期
基金：
中国国家自然科学基金;
关键词：
OPTICAL VORTEX GENERATION; MODES;
D O I：
10.1364/OE.449619
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A method employing femtosecond lasers to inscribe helical long period fiber grating (HLPFG) for exciting orbital angular momentum (OAM) of light is experimentally demonstrated. In this method, the refractive index modulation (RIM) of HLPFG is realized by three-dimensional translation of a fiber without rotation, indicating better stability, repeatability and flexibility. The coupling efficiency can be customized by varying the radius of the helical RIM, except laser energy. The characteristics of phase and polarization purity of the coupled modes in HLPFGs are studied. Results show that HLPFGs can directly excite OAM modes, the polarization state and helical phase of the mode can be adjusted independently, and the purity is the highest at resonant wavelength, over 91%. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
引用
收藏
页码：4402 / 4411
页数：10
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