Femtosecond laser coherent beam combining system delivering kilowatt-level average power based on all-fiber chirped pulse amplification

Wang Tao; Zhang Jiayi; Ren Bo; Tang Zhenqiang; Chang Hongxiang; Li Tijian; He Zhiwen; Zhou Yi; Li Can; Leng Jinyong; Luo Zhichao; Zhou Pu

doi:10.11884/HPLPB202638.250430

Article Contents

Article Navigation > High Power Laser and Particle Beams > 2026 > Accepted Manuscript

Wang Tao, Zhang Jiayi, Ren Bo, et al. Femtosecond laser coherent beam combining system delivering kilowatt-level average power based on all-fiber chirped pulse amplification[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250430

Citation:

Wang Tao, Zhang Jiayi, Ren Bo, et al. Femtosecond laser coherent beam combining system delivering kilowatt-level average power based on all-fiber chirped pulse amplification[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250430

Citation:

Wang Tao, Zhang Jiayi, Ren Bo, et al. Femtosecond laser coherent beam combining system delivering kilowatt-level average power based on all-fiber chirped pulse amplification[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250430

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Femtosecond laser coherent beam combining system delivering kilowatt-level average power based on all-fiber chirped pulse amplification

doi: 10.11884/HPLPB202638.250430

1.
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2.
School of Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China

Received Date: 2025-11-30
Accepted Date: 2025-12-25
Rev Recd Date: 2025-01-01

Available Online: 2026-01-21

Abstract

Abstract

Background
High-power femtosecond fiber lasers have extensive applications in advanced manufacturing, laser particle acceleration, high-order harmonic generation and so on. Coherent beam combining (CBC) of femtosecond fiber lasers serves as an effective technical approach to overcome the power limitations of single fibers and achieve high-power femtosecond laser output.
Purpose
This work aims to develop a high-power femtosecond fiber laser CBC system to achieve kilowatt-level average power output with high stability.
Methods
The presented femtosecond fiber laser CBC system is based on a three-channel all-fiber chirped pulse amplifier. Phase adjustment and stable coherent combining of three laser amplifiers are achieved using fiber stretchers in combination with the stochastic parallel gradient descent (SPGD) algorithm.
Results
At a total output power of 1219.1 W, the system delivers a combined power of 1072 W, corresponding to a combining efficiency of 87%. The combined beam exhibits near-diffraction-limited beam quality (M²=1.23), and the compressed pulse width is 899 fs. Furthermore, the influence of beam quality degradation on the combining efficiency is theoretically analyzed. The results show that the combining efficiency would decrease as the beam quality degradation rate increased, and the combining efficiency is more sensitive to the degradation of multi-channel beam quality.
Conclusions
The demonstrated all-fiber coherent beam combining system exhibits excellent stability and high-power output. Further power scaling can be realized by increasing the number of combining channels, thereby providing crucial technical support for the advanced applications of high flux ultrafast and ultra-intense lasers.
- ultrafast fiber laser,
- coherent beam combination,
- high power femtosecond laser,
- chirped pulse amplification,
- active phase control

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References(30)

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