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<p>This paper demonstrates the generation of stable pulse trains from an all-optical passive Q-switched random fiber laser (PQRFL) consisting of a cascade of doped fiber segments and a random phase-shifted Bragg grating (RPS-FBG). The RFL structure employs a wide-reflection-range RPS-FBG to provide the stochastic feedback, and a commercially available Erbium-Ytterbium co-doped fiber amplifier (EYDFA) with two-stage pumping to provide the cavity gain, while the two cascaded doped-fiber segments of its erbium-doped fiber (EDF) and erbium-ytterbium doped fiber (EYDF) serve as saturable absorbers in the case of incomplete pumping. This experiment mainly investigates the different nonlinear characteristics of the two pump lasers under different pumps combinations, and the RFL finally achieves the generation of passive Q-switched pulse with repetition frequencies between 18.32&#xa0;kHz and 49.02&#xa0;kHz and pulse widths between 0.66 µs and 5.98 µs, and the stable individual wavelengths obtained at the same time can be tuned in the range up to 26&#xa0;nm. The proposed PQRFL and has a broad application prospect in the field of optical measurement and laser imaging.</p>

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Wavelength-tunable passively Q-switched random fiber laser based on cascaded doped fiber segments and random phase-shifted Bragg grating

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Yichen Li,
  • Honggang Pan,
  • Bin Li,
  • Yating Tang,
  • Xinjie Zhao,
  • Qingcheng You,
  • Yukun Zhu

摘要

This paper demonstrates the generation of stable pulse trains from an all-optical passive Q-switched random fiber laser (PQRFL) consisting of a cascade of doped fiber segments and a random phase-shifted Bragg grating (RPS-FBG). The RFL structure employs a wide-reflection-range RPS-FBG to provide the stochastic feedback, and a commercially available Erbium-Ytterbium co-doped fiber amplifier (EYDFA) with two-stage pumping to provide the cavity gain, while the two cascaded doped-fiber segments of its erbium-doped fiber (EDF) and erbium-ytterbium doped fiber (EYDF) serve as saturable absorbers in the case of incomplete pumping. This experiment mainly investigates the different nonlinear characteristics of the two pump lasers under different pumps combinations, and the RFL finally achieves the generation of passive Q-switched pulse with repetition frequencies between 18.32 kHz and 49.02 kHz and pulse widths between 0.66 µs and 5.98 µs, and the stable individual wavelengths obtained at the same time can be tuned in the range up to 26 nm. The proposed PQRFL and has a broad application prospect in the field of optical measurement and laser imaging.