光学
材料科学
拉曼散射
光纤激光器
激光器
拉曼光谱
叠加原理
光电子学
物理
量子力学
作者
Mao Lin Huang,Jiadong Wu,Jiahao Hong,Hualei Lei,Chujun Zhao,Yu Chen,Dianyuan Fan
出处
期刊:Optics Express
[The Optical Society]
日期:2021-11-19
卷期号:29 (24): 40538-40538
被引量:3
摘要
High energy pulsed High-order Mode (HOM) beams has great potential in materials processing and particle acceleration. We experimentally demonstrate a high energy mode-locking Raman all-fiber laser with switchable HOM state. A home-made fiber mode-selective coupler (MSC) is used as the mode converter with a wide bandwidth of 60 nm. By combining advantages of MSC and stimulated Raman scattering, 1.1 μJ pulsed HOM beams directly emitting from the all-fiber cavity can be achieved. After controlling the category and phase delay of vector modal superposition, different pulsed HOM beams including cylindrical vector beams (CVBs) (radial and angular) and optical vortex beams (OVBs) are reasonably obtained with high purity (all over 95%), as well as arbitrary switching. Furtherly, the slope efficiency of HOM beams in the mode-locking and continuous wave operations are as much as 20.3% and 31.8%, respectively. It may provide an effective way to achieve high energy pulsed HOM beams.
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