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  • Received: Nov. 22, 2017

    Accepted: Jan. 18, 2018

    Posted: Jan. 17, 2019

    Published Online: Jul. 13, 2018

    The Author Email: Xiaojun Xu (xu_xiaojun@126.com)

    DOI: 10.3788/COL201816.031407

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    Baolai Yang, Hanwei Zhang, Qing Ye, Haoyang Pi, Chen Shi, Rumao Tao, Xiaolin Wang, Xiaojun Xu. 4.05 kW monolithic fiber laser oscillator based on home-made large mode area fiber Bragg gratings[J]. Chinese Optics Letters, 2018, 16(3): 031407

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Chinese Optics Letters, Vol. 16, Issue 3, 031407 (2018)

4.05 kW monolithic fiber laser oscillator based on home-made large mode area fiber Bragg gratings

Baolai Yang1, Hanwei Zhang1,2,3, Qing Ye4, Haoyang Pi4, Chen Shi1,2,3, Rumao Tao1,2,3, Xiaolin Wang1,2,3, and Xiaojun Xu1,2,3,*

Author Affiliations

  • 1College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
  • 2Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
  • 3Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China
  • 4Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

Abstract

With the increasing output power of the monolithic fiber laser oscillators, the stimulated Raman scattering (SRS) effect becomes one of the main limitations of power scaling. Employing fiber with a larger mode area is an effective technique to mitigate the SRS, but, for the monolithic fiber laser oscillators, the difficulty of the inscription of the high-reflection fiber Bragg gratings (FBGs) increases with the fiber mode area. In this work, we demonstrated a high-power monolithic fiber laser oscillator based on the home-made large mode area FBGs and ytterbium-doped fiber (YDF) with 25 μm core diameters. A maximum output power of 4.05 kW is achieved at the central wavelength of 1080 nm with a total 915 nm pump power of 6.7 kW. At the operation of 4.05 kW, the intensity of the Raman Stokes light is 25 dB below the signal laser, and the beam quality (M2-factor) is 2.2. To the best of our knowledge, this is the first detailed report of the monolithic fiber laser oscillator with an output power beyond 4 kW.