High Power Laser Science and Engineering, 2022, 10 (6): 06000e44, Published Online: Jan. 9, 2023   

Transverse mode instability mitigation in a high-power confined-doped fiber amplifier with good beam quality through seed laser control

Author Affiliations
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
Abstract
In this work, a confined-doped fiber with the core/inner-cladding diameter of 40/250 μm and a relative doping ratio of 0.75 is fabricated through a modified chemical vapor deposition method combined with the chelate gas deposition technique, and subsequently applied in a tandem-pumped fiber amplifier for high-power operation and transverse mode instability (TMI) mitigation. Notably, the impacts of the seed laser power and mode purity are preliminarily investigated through comparative experiments. It is found that the TMI threshold could be significantly affected by the seed laser mode purity. The possible mechanism behind this phenomenon is proposed and revealed through comprehensive comparative experiments and theoretical analysis. Finally, a maximum output power of 7.49 kW is obtained with the beam quality factor of approximately 1.83, which is the highest output power ever reported in a forward tandem-pumped confined-doped fiber amplifier. This work could provide a good reference and practical solution to improve the TMI threshold and realize high-power high-brightness fiber lasers.

Hanshuo Wu, Haobo Li, Yi An, Ruixian Li, Xiao Chen, Hu Xiao, Liangjin Huang, Huan Yang, Zhiping Yan, Jinyong Leng, Zhiyong Pan, Pu Zhou. Transverse mode instability mitigation in a high-power confined-doped fiber amplifier with good beam quality through seed laser control[J]. High Power Laser Science and Engineering, 2022, 10(6): 06000e44.

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