• High Power Laser Science and Engineering
  • Vol. 9, Issue 3, 03000e39 (2021)
Yinxu Bian1、2, Kerong Jiao1、2, Xuecheng Wu1、2, Hua Shen1、2、3、*, Feiyan Yang1、2, and Rihong Zhu1、2
Author Affiliations
  • 1School of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing210094, China
  • 2MIIT Key Laboratory of Advanced Solid Laser, Nanjing University of Science and Technology, Nanjing210094, China
  • 3Department of Material Science and Engineering, University of California Los Angeles, Los Angeles, CA90095, USA
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    Abstract

    Suppressing nonlinear effects in high-power fiber lasers based on fiber gratings has become a hotspot. At present, research is mainly focused on suppressing stimulated Raman scattering in a high-power fiber laser. However, the suppression of spectral broadening, caused by self-phase modulation or four-wave mixing, is still a challenging attribute to the close distance between the broadened laser and signal laser. If using a traditional fiber grating with only one stopband to suppress the spectral broadening, the signal power will be stripped simultaneously. Confronting this challenge, we propose a novel method based on phase-shifted long-period fiber grating (PS-LPFG) to suppress spectral broadening in a high-power fiber master oscillator power amplifier (MOPA) laser system in this paper. A PS-LPFG is designed and fabricated on 10/130 passive fiber utilizing a point-by-point scanning technique. The resonant wavelength of the fabricated PS-LPFG is 1080 nm, the full width at half maximum of the passband is 5.48 nm, and stopband extinction exceeds 90%. To evaluate the performance of the PS-LPFG, the grating is inserted into the seed of a kilowatt-level continuous-wave MOPA system. Experiment results show that the 30 dB linewidth of the output spectrum is narrowed by approximately 37.97%, providing an effective and flexible way for optimizing the output linewidth of high-power fiber MOPA laser systems.
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    Yinxu Bian, Kerong Jiao, Xuecheng Wu, Hua Shen, Feiyan Yang, Rihong Zhu. Utilizing phase-shifted long-period fiber grating to suppress spectral broadening of a high-power fiber MOPA laser system[J]. High Power Laser Science and Engineering, 2021, 9(3): 03000e39
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    Category: Research Articles
    Received: Nov. 30, 2020
    Accepted: Apr. 29, 2021
    Posted: Jul. 15, 2021
    Published Online: Jul. 15, 2021
    The Author Email: Hua Shen (edwardbayun@163.com)