Effects of background spectral noise in the phase-modulated single-frequency seed laser on high-power narrow-linewidth fiber amplifiers  

作　　者：Wei Liu Jiaxin Song Pengfei Ma Hu Xiao Pu Zhou 

机构地区：[1]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China

出　　处：《Photonics Research》2021年第3期424-431,共8页光子学研究（英文版）

基　　金：National Natural Science Foundation of China (62005313, 61705264);Innovative Research Team in Natural Science Foundation of Hunan Province(2019JJ10005);Hunan Provincial Innovation Construct Project (2019RS3017);Guangdong Key Research and Development Program (2018B090904001)。

摘　　要：In this work, we analyze the effects of the background spectral noise in phase-modulated single-frequency seed lasers on the spectral purity of high-power narrow-linewidth fiber amplifiers. Through demonstrating the spectral evolution of the phase-modulated single-frequency part and the background spectral noise in a narrow-linewidth fiber amplifier, the mechanism for the spectral wing broadening effect is clarified and design strategies to maintain high spectral purity are given. Specifically, the background spectral noise in phase-modulated single-frequency seed lasers could lead to obvious spectral wing broadening and degeneration of spectral purity in narrow-linewidth fiber amplifiers through the four-wave-mixing effect. Notably, the spectral wing broadening effect could be suppressed by filtering out the background spectral noise in the seed laser or applying a counter-pumped configuration in the fiber amplifier. We have also conducted contrast experiments, which have verified the validity of the theoretical model and the design strategies for high-spectral-purity operation.

关 键 词：fiber amplifier PUMPED 

分 类 号：TN248[电子电信—物理电子学] TN722