• High Power Laser Science and Engineering
  • Vol. 9, Issue 3, 03000e45 (2021)
Pengfei Ma, Hu Xiao, Wei Liu, Hanwei Zhang, Xiaolin Wang, Jinyong Leng, and Pu Zhou*
Author Affiliations
  • College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha410073, China
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    Abstract

    In this paper, an all-fiberized and narrow-linewidth 5 kW power-level fiber amplifier is presented. The laser is achieved based on the master oscillator power amplification configuration, in which the phase-modulated single-frequency laser is applied as the seed laser and a bidirectional pumping configuration is applied in the power amplifier. The stimulated Brillouin scattering, stimulated Raman scattering, and transverse mode instability effects are all effectively suppressed in the experiment. Consequently, the output power is scaled up to 4.92 kW with a slope efficiency of as high as approximately 80%. The 3-dB spectral width is about 0.59 nm, and the beam quality is measured to be M2∼1.22 at maximum output power. Furthermore, we have also conducted a detailed spectral analysis on the spectral width of the signal laser, which reveals that the spectral wing broadening phenomenon could lead to the obvious decrease of the spectral purity at certain output power. Overall, this work could provide a reference for obtaining and optimizing high-power narrow-linewidth fiber lasers.
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    Pengfei Ma, Hu Xiao, Wei Liu, Hanwei Zhang, Xiaolin Wang, Jinyong Leng, Pu Zhou. All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration[J]. High Power Laser Science and Engineering, 2021, 9(3): 03000e45
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    Category: Research Articles
    Received: Jan. 16, 2021
    Accepted: Jun. 28, 2021
    Published Online: Aug. 19, 2021
    The Author Email: Pu Zhou (zhoupu203@163.com)