Liu Rui, Li Yali, Chen Jiayan, Wu Luping, Ran Jianjun, Chen Zikai, Bai Zhiyong, Huang Churou, Huang Zheng, Zhu Guoxuan, Liao Changrui, Wang Yiping
Opt Express. 2022 Aug 1;30(16):28745-28751. doi: 10.1364/OE.467491.
We experimentally demonstrated an all-fiber reflective orbital angular momentum (OAM) generator based on orthogonal fiber Bragg grating (OFBG). The OFBG is formed by using a femtosecond laser to prepare two fiber Bragg gratings with a certain spacing in orthogonal planes. The ±1st- and ±2nd-order OAM modes were directly excited in this OFBG, and the chirality of the OAM modes depends on the relative positions of the two FBGs. The mode coupling properties and effects of center-to-center distance on OAM modes were investigated as well.
我们通过实验证明了一种基于正交光纤布拉格光栅（OFBG）的全光纤反射式轨道角动量（OAM）发生器。该正交光纤布拉格光栅是利用飞秒激光在正交平面内制备两个具有一定间距的光纤布拉格光栅形成的。在这种正交光纤布拉格光栅中直接激发了±1阶和±2阶OAM模式，且OAM模式的手性取决于两个光纤布拉格光栅的相对位置。同时还研究了模式耦合特性以及中心距对OAM模式的影响。
