• High Power Laser Science and Engineering
  • Vol. 10, Issue 4, 04000e22 (2022)
Guangjian Wang, Jiaxin Song, Yisha Chen, Shuai Ren, Pengfei Ma*, Wei Liu, Tianfu Yao, and Pu Zhou*
Author Affiliations
  • College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha410073, China
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    DOI: 10.1017/hpl.2022.12 Cite this Article
    Guangjian Wang, Jiaxin Song, Yisha Chen, Shuai Ren, Pengfei Ma, Wei Liu, Tianfu Yao, Pu Zhou. Six kilowatt record all-fiberized and narrow-linewidth fiber amplifier with near-diffraction-limited beam quality[J]. High Power Laser Science and Engineering, 2022, 10(4): 04000e22 Copy Citation Text show less

    Abstract

    In this work, an all-fiberized and narrow-linewidth fiber amplifier with record output power and near-diffraction-limited beam quality is presented. Up to 6.12 kW fiber laser with the conversion efficiency of approximately 78.8% is achieved through the fiber amplifier based on a conventional step-index active fiber. At the maximum output power, the 3 dB spectral linewidth is approximately 0.86 nm and the beam quality factor is Mx2 = 1.43, My2 = 1.36. We have also measured and compared the output properties of the fiber amplifier employing different pumping schemes. Notably, the practical power limit of the fiber amplifier could be estimated through the maximum output powers of the fiber amplifier employing unidirectional pumping schemes. Overall, this work could provide a good reference for the optimal design and potential exploration of high-power narrow-linewidth fiber laser systems.

    1 Introduction

    High-power fiber lasers are attractive laser sources in many applications, benefitting from the essential advantages of high efficiency, excellent beam quality, compact structure and convenient thermal management[13]. Restricted by the pump brightness, stimulated Raman scattering (SRS) effect, transverse mode instability (TMI) effect, etc., monolithic fiber lasers with near-diffraction-limited beam quality have achieved over 10-kW level output in experiments[4,5], and there is a theoretical power limit[68].

    Guangjian Wang, Jiaxin Song, Yisha Chen, Shuai Ren, Pengfei Ma, Wei Liu, Tianfu Yao, Pu Zhou. Six kilowatt record all-fiberized and narrow-linewidth fiber amplifier with near-diffraction-limited beam quality[J]. High Power Laser Science and Engineering, 2022, 10(4): 04000e22
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