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

doi:10.1088/1674-1056/ac448a

中国物理B ›› 2022, Vol. 31 ›› Issue (6): 64201-064201.doi: 10.1088/1674-1056/ac448a

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

Yun-Chen Zhu(朱云晨)¹, Ping-Xue Li(李平雪)^1,†, Chuan-Fei Yao(姚传飞)¹, Chun-Yong Li(李春勇)², Wen-Hao Xiong(熊文豪)¹, and Shun Li(李舜)¹

1 Institute of Ultrashort Pulsed Laser and Application, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China;
2 Department of Physics, Durham University, South Road, Durham DH13 LE, UK

收稿日期:2021-08-24 修回日期:2021-12-10 接受日期:2021-12-18 出版日期:2022-05-17 发布日期:2022-05-17
通讯作者: Ping-Xue Li E-mail:pxli@bjut.edu.cn
基金资助:
Project supported by the Key Program of Beijing Municipal Natural Science Foundation, China (Grant No. KZ201910005006), the National Natural Science Foundation of China (Grant No. 62005004), Natural Science Foundation of Beijing Municipality, China (Grant No. 4204091), and National Science Foundation for Post-doctor Scientists of China (Grant No. 212423).

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

Yun-Chen Zhu(朱云晨)¹, Ping-Xue Li(李平雪)^1,†, Chuan-Fei Yao(姚传飞)¹, Chun-Yong Li(李春勇)², Wen-Hao Xiong(熊文豪)¹, and Shun Li(李舜)¹

1 Institute of Ultrashort Pulsed Laser and Application, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China;
2 Department of Physics, Durham University, South Road, Durham DH13 LE, UK

Received:2021-08-24 Revised:2021-12-10 Accepted:2021-12-18 Online:2022-05-17 Published:2022-05-17
Contact: Ping-Xue Li E-mail:pxli@bjut.edu.cn
Supported by:
Project supported by the Key Program of Beijing Municipal Natural Science Foundation, China (Grant No. KZ201910005006), the National Natural Science Foundation of China (Grant No. 62005004), Natural Science Foundation of Beijing Municipality, China (Grant No. 4204091), and National Science Foundation for Post-doctor Scientists of China (Grant No. 212423).

摘要/Abstract

摘要： 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.

关键词: coherent beam combination, spectral coherence, optical nonlinearity

Abstract: 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.

Key words: coherent beam combination, spectral coherence, optical nonlinearity

中图分类号: (Coherence)

42.25.Kb

42.55.Wd (Fiber lasers) 42.65.Jx (Beam trapping, self-focusing and defocusing; self-phase modulation)

Yun-Chen Zhu(朱云晨), Ping-Xue Li(李平雪), Chuan-Fei Yao(姚传飞), Chun-Yong Li(李春勇),Wen-Hao Xiong(熊文豪), and Shun Li(李舜). Influence of optical nonlinearity on combining efficiency in ultrashort pulse fiber laser coherent combining system[J]. 中国物理B, 2022, 31(6): 64201-064201.

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

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

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