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Highly-stable, flexible delivery of microjoule-level ultrafast pulses in vacuumized anti-resonant hollow-core fibers for active synchronization

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posted on 2023-06-08, 13:02 authored by Chuanchuan Yan, Hongyang Li, Zhiyuan Huang, Xinliang Wang, Donghan Liu, Xingyan Liu, Jinyu Pan, Zhuozhao Luo, Fei Yang, Yu Zheng, Ruochen Yin, Haihu Yu, Yuxin Leng, Liwei Song, Meng Pang, Xin Jiang
We demonstrate the stable and flexible light delivery of multi-{\mu}J, sub-200-fs pulses over a ~10-m-long vacuumized anti-resonant hollow-core fiber (AR-HCF), which was successfully used for high-performance pulse synchronization. Compared with the pulse train launched into the AR-HCF, the transmitted pulse train out of the fiber exhibits excellent stabilities in pulse power and spectrum, with pointing stability largely improved. The walk-off between the fiber-delivery and the other free-space-propagation pulse trains, in an open loop, was measured to be <6 fs root-mean-square (RMS) over 90 minutes, corresponding to a relative optical-path variation of <2x10-7. This walk-off can be further suppressed to ~2 fs RMS simply using an active control loop, highlighting the great application potentials of this AR-HCF set-up in large-scale laser and accelerator facilities.



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