光学
多模光纤
长周期光纤光栅
角动量
光纤布拉格光栅
渐变折射率纤维
物理
纤维
模式音量
色散位移光纤
单模光纤
栅栏
光纤
材料科学
保偏光纤
光纤传感器
塑料光纤
量子力学
复合材料
作者
Hua Zhao,Peng Wang,Takuya Yamakawa,Hongpu Li
出处
期刊:Optics Letters
[The Optical Society]
日期:2019-10-29
卷期号:44 (21): 5370-5370
被引量:59
摘要
An all-fiber orbital angular momentum (OAM) generator enabling direct turning of the fundamental mode (${{\rm HE}_{11}}$HE11) to the second OAM modes (${ l} = {\pm 2}$l=±2) with an efficiency of $\sim90\% $∼90% has been proposed and experimentally demonstrated, which is realized based on utilization of a second-order helical fiber grating written in a few-mode fiber. This is the first time, to the best of our knowledge, that an all-fiber second-order OAM has been achieved with using only one component, i.e., the helical long-period fiber grating. The proposed method opens a new way to efficiently generate an all-fiber higher-order OAM using a conventional multimode fiber.
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