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  • Received: Nov. 19, 2019

    Accepted: Jan. 23, 2020

    Posted: Jan. 23, 2020

    Published Online: Feb. 28, 2020

    The Author Email: Changsheng Yang (mscsyang@scut.edu.cn)

    DOI: 10.1364/PRJ.383174

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    Xianchao Guan, Qilai Zhao, Wei Lin, Tianyi Tan, Changsheng Yang, Pengfei Ma, Zhongmin Yang, Shanhui Xu. High-efficiency and high-power single-frequency fiber laser at 1.6 μm based on cascaded energy-transfer pumping[J]. Photonics Research, 2020, 8(3): 03000414

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Photonics Research, Vol. 8, Issue 3, 03000414 (2020)

High-efficiency and high-power single-frequency fiber laser at 1.6 μm based on cascaded energy-transfer pumping

Xianchao Guan1,2, Qilai Zhao2, Wei Lin1,2, Tianyi Tan2, Changsheng Yang2,4,6,*, Pengfei Ma2,7, Zhongmin Yang1,2,3,5,6, and Shanhui Xu2,3,4

Author Affiliations

  • 1School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
  • 2State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China
  • 3Guangdong Engineering Technology Research and Development Center of High-performance Fiber Laser Techniques and Equipment, Zhuhai 519031, China
  • 4Hengqin Firay Sci-Tech Company Ltd., Zhuhai 519031, China
  • 5Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, Guangzhou 510640, China
  • 6Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510640, China
  • 7e-mail: pengfeima_scut@163.com

Abstract

In this paper, a technique combining cascaded energy-transfer pumping (CEP) method and master-oscillator power-amplifier (MOPA) configuration is proposed for power scaling of 1.6-μm-band single-frequency fiber lasers (SFFLs), where the Er3+ ion has a limited gain. The CEP technique is fulfilled by coupling a primary signal light at 1.6 μm and a C-band auxiliary laser. The numerical model of the fiber amplifier with the CEP technique reveals that the energy transfer process involves the pump competition and the in-band particle transition between the signal and auxiliary lights. Moreover, for the signal emission, the population density in the upper level is enhanced, and the effective population inversion is achieved thanks to the CEP. A single-frequency MOPA laser at 1603 nm with an output power of 52.6 W and an improved slope efficiency of 30.4% is experimentally obtained through the CEP technique. Besides, a laser linewidth of 5.2 kHz and a signal-to-auxiliary laser ratio of 60.7 dB are obtained at the maximum output power. The proposed technique is anticipated to be promising for increasing the slope efficiency and power scaling for fiber lasers operating at L band.

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