All-fiber highly efficient delivery of 2 kW laser over 2.45 km hollow-core fiber

Jing Shi, Binyu Rao, Zilun Chen (), Zefeng Wang (), Guangrong Sun, Zuying Xu, Zhen Huang, Peng Li, Zihan Dong, Min Fu, Xin Tian, Baolai Yang, Jian Zhang, Zhiyue Zhou, Tianyu Li, Lei Zhang, Biao Shui, Chenxin Gao and Jinbao Chen ()
Additional contact information
Jing Shi: National University of Defense Technology
Binyu Rao: National University of Defense Technology
Zilun Chen: National University of Defense Technology
Zefeng Wang: National University of Defense Technology
Guangrong Sun: National University of Defense Technology
Zuying Xu: Everfoton Technologies Corporation Limited
Zhen Huang: National University of Defense Technology
Peng Li: Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC)
Zihan Dong: Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC)
Min Fu: National University of Defense Technology
Xin Tian: National University of Defense Technology
Baolai Yang: National University of Defense Technology
Jian Zhang: National University of Defense Technology
Zhiyue Zhou: National University of Defense Technology
Tianyu Li: National University of Defense Technology
Lei Zhang: Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC)
Biao Shui: Everfoton Technologies Corporation Limited
Chenxin Gao: National University of Defense Technology
Jinbao Chen: National University of Defense Technology

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Anti-resonant hollow-core fibers have emerged as an important medium for high-power laser delivery due to their low optical nonlinearity and high damage threshold. However, current delivery systems of high-power laser based on anti-resonant hollow-core fibers mainly rely on free-space optical components, which limits long-term stability. Here, we report an all-fiber delivery of 2 kW laser with 85.4% transmission efficiency over 2.45 km, using a self-fabricated hollow-core fiber with a record low transmission loss of 0.168 dB/km at 1080 nm. Notably, we observed the phenomenon of stimulated Raman scattering amplified within the silica nested tubes for the first time. By effectively suppressing the Raman noise from the laser source, we achieve an all-fiber laser delivery without stimulated Raman scattering of silica glass. This work marks a significant breakthrough in multi-kilometer and multi-kilowatt power delivery that is potentially useful for industrial manufacturing, nuclear decommissioning, laser drilling in oil and so on.

Date: 2025
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DOI: 10.1038/s41467-025-64073-y

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