Influence of optical nonlinearity on combining efficiency in ultrashort pulse fiber laser coherent combining system

The influence of optical nonlinearity on combining efficiency in ultrashort pulse fiber laser coherent combining system is investigated theoretically and experimentally. In the theoretical work, a new theoretical algorithm is presented for the coherent combining efficiency, which can be used to quan...

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Bibliographic Details
Published in:Chinese physics B 2022-05, Vol.31 (6), p.64201-391
Main Authors: Zhu, Yun-Chen, Li, Ping-Xue, Yao, Chuan-Fei, Li, Chun-Yong, Xiong, Wen-Hao, Li, Shun
Format: Article
Language:English
Subjects:
coherent beam combination
optical nonlinearity
spectral coherence
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Summary:The influence of optical nonlinearity on combining efficiency in ultrashort pulse fiber laser coherent combining system is investigated theoretically and experimentally. In the theoretical work, a new theoretical algorithm is presented for the coherent combining efficiency, which can be used to quantify the spectral coherence decay induced by optical nonlinearity imbalance between the sub-beams. The spectral information of the sub-beam is obtained by numerically solving the nonlinear Schrödinger equation (NLSE) in this algorithm to ensure an accurate prediction. In the experimental work, the coherent combining of two all-fiber picosecond lasers is achieved, and the influence of imbalanced optical nonlinearity on the combining efficiency is studied, which agrees with the theoretical prediction. This paper reveals the physical mechanism for the influence of optical nonlinearity on the combining efficiency, which is valuable for the coherent combining of ultrashort pulse fiber laser beams.
ISSN:1674-1056
DOI:10.1088/1674-1056/ac448a