光学
布里渊散射
瑞利散射
材料科学
模式音量
光纤布拉格光栅
单模光纤
激光线宽
模式扰频器
光纤激光器
光纤
辐射模式
纤维
保偏光纤
激光器
光纤传感器
物理
复合材料
作者
Zizhou Wei,Liang Zhang,Yichun Li,Chen Wei,Han Wang,Mengshi Zhu,Xianglong Zeng,Fufei Pang,Tingyun Wang
标识
DOI:10.1016/j.rinp.2024.107531
摘要
A high-order-mode (HOM) Brillouin random fiber laser (BRFL) based on distributed Rayleigh scattering in an all-few-mode fiber cavity is proposed and experimentally demonstrated. Compared to traditional BRFLs oscillating in the single-mode-fiber cavity, the few-mode-fiber random cavity allows the high-order spatial mode Stokes beams being activated and amplified via intra-mode stimulated Brillouin scattering for sufficient gain. Besides random feedback of distributed Rayleigh scattering along few-mode fibers, a few-mode fiber Bragg grating (FM-FBG) is employed to provide the one-end transverse mode-dependent reflection, which facilitates a high-purity oscillating random laser mode switchable between LP01 and LP11 mode by readily tunning the working wavelength of the Brillouin pump. Consequently, the all few-mode fiber-based BRFL emits a 600-Hz narrow-linewidth LP11 mode with a high mode purity of ∼91.3 %, which paves the way for spatial multiplexing coherent communication, high-resolution imaging, highly sensitive sensing, etc.
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