光学学报, 2020, 40 (14): 1406002, 网络出版: 2020-07-23
横向模式可切换的少模环形光纤激光器 下载: 991次
Transverse-Mode Switchable Few-Mode Ring Fiber Lasers
光纤光学 光纤激光器 模式复用器/解复用器 模式转换 模式选择耦合器 fiber optics fiber lasers mode multiplexer/demultiplexer mode switching mode-selective coupler
摘要
设计一种基于腔内全光纤模式复用器/解复用器(MUX/DEMUX)的少模环形光纤激光器,实现了LP01模、LP11模、LP21模及混合模式可切换的激光输出。实验结果表明,利用低串扰的全光纤模式MUX/DEMUX结合4×1光开关,激光器可在三个最低阶的线偏振(LP)模式及其混合模式之间进行切换,LP01模、LP11模、LP21模的泵浦阈值分别为40、60、80 mW,斜率效率分别为1.2%、0.82%、0.56%。对设计的少模环形光纤激光器结构进行数值模拟和参数优化,极大地改善了波长偏移问题,实现了小于0.032 nm的3 dB线宽。
Abstract
A few-mode ring fiber laser based on an all-fiber mode multiplexer/demultiplexer (MUX/DEMUX) was designed, which achieved switchable lasing output in LP01, L , LP21, and hybrid modes. Experimental results show that the output lasing mode of the ring fiber laser can be switched between the three lowest-order linearly polarized (LP) modes and hybrid modes by employing a low mode-crosstalk all-fiber mode MUX/DEMUX and a simple 4 × 1 optical switch. Thresholds of 40, 60, and 80 mW and slope efficiencies of 1.2%, 0.82%, and 0.56% were obtained for the LP01, LP11, and LP21 mode operations, respectively. Numerical simulation and parameter optimization of the designed few-mode ring fiber laser structure adequately resolved the wavelength shift problem, with a line width of 3 dB less than 0.032 nm being realized.
李晓风, 李哲, 吴文矛, 李巨浩, 任芳. 横向模式可切换的少模环形光纤激光器[J]. 光学学报, 2020, 40(14): 1406002. Xiaofeng Li, Zhe Li, Wenmao Wu, Juhao Li, Fang Ren. Transverse-Mode Switchable Few-Mode Ring Fiber Lasers[J]. Acta Optica Sinica, 2020, 40(14): 1406002.