Current Optics and Photonics

Optical Society of Korea (한국광학회)
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3.2-kW 9.7-GHz Polarization-maintaining Narrow-linewidth All-fiber Amplifier

  • Hang Liu (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Yujun Feng (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Xiaobo Yang (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Yao Wang (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Hongming Yu (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Jue Wang (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Wanjing Peng (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Yanshan Wang (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Yinhong Sun (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Yi Ma (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Qingsong Gao (Institute of Applied Electronics, China Academy of Engineering Physics) ;
  • Chun Tang (Institute of Applied Electronics, China Academy of Engineering Physics)
  • Received : 2023.07.13
  • Accepted : 2023.11.30
  • Published : 2024.02.25
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Abstract

We present a Yb-doped narrow-linewidth polarization-maintaining all-fiber amplifier that achieves a high mode-instability (MI) threshold, high output power, and 9.7-GHz spectral linewidth. Six wavelength-multiplexed laser diodes are used to pump this amplifier. First, we construct a high-power fiber amplifier based on a master oscillator-power amplifier configuration for experiments. Subsequently, we examine the MI threshold by individually pumping the amplifier with wavelengths of 976, 974, 981, 974, and 981 nm respectively. The experimental results demonstrate that the amplifier exhibits a high MI threshold (>3.5 kW) when pumped with a combination of wavelengths at 974 and 981 nm. Afterward, we inject an optimized phase-modulated seed with a nearly flat-top spectrum into this amplifier. Ultimately, laser output of 3.2 kW and 9.7 GHz are obtained.

Keywords

Acknowledgement

Innovation Development Fund of CAEP (C-2021-CX20210047).

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