Spectral Broadening Suppressed by a Gain-Enhanced Fiber in Polarization Maintaining High-Power Systems

作者：Shibiao Liao, Tao Luo, Runheng Xiao, Yingbo Chu, Haiqing Li, Yingbin Xing, Jinyan Li, Nengli Dai · 发表于：IEEE photonics journal · 年份：2022 · DOI：10.1109/jphot.2022.3221834 · 被引用次数：8 · 研究领域：Photonic Crystal and Fiber Optics、Advanced Fiber Laser Technologies、Advanced Fiber Optic Sensors

A gain-enhanced 10/125 μm polarization-maintaining Yb-doped fiber (PMYDF), with the cladding absorption of 7.5 dB/m at 976 nm, for narrow linewidth linearly polarized fiber oscillator or amplifiers is presented. By utilizing the gain-enhanced PMYDF in an all-fiber laser oscillator, an output power of 123 W is achieved with applying appropriate bending strategies and thermal management, corresponding to the slope efficiency of 86.7%. By applying the gain-enhanced PMYDF in seed, an increase of 34% in the longitudinal mode interval is effectively achieved compared to the commercial PMYDF, while the number of longitudinal modes is only 75%. According to the main oscillation power amplification (MOPA) system, the total amount of spectral broadening applying the seed with the gain-enhanced PMYDF are only 67%, 64% and 54% of applying the seed with the commercial PMYDF, corresponding to co-pumping, bi-pumping and counter-pumping schemes, respectively.