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<p>By contrasting the Q‑switched laser’s output characteristics with those of continuous wave all-fibre lasers, this study investigates how an erbium-doped all-fibre laser operates when it is passively Q‑switched and employs a&#xa0;tin sulfide (<i>SnS</i>) based saturable absorber. The modification of the laser’s Q‑factor and its impact on the repetition rate, output power, pulse width, and pulse energy have been studied. The findings demonstrated that at the necessary 1.5 µm wavelength, high-energy Q‑switched pulses were effectively produced within the pump power range of 105.26 mW to 160.4 mW, with repetition rates ranging from 40.19 to 45.67 kHz. At an input pump power of 160.4 mW, the Erbium-Doped Fibre Laser produced a&#xa0;pulse width of 5.18 µs and energy of 34.8 nJ. These findings suggest that <i>SnS</i> could be a&#xa0;promising SA for producing pulses in the 1.5 µm wavelength band.</p>

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Passively Q-Switched erbium-doped all-fibre laser with tin sulfide saturable absorber

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月6日

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  • Kawther M. Musthafa,
  • Azura Hamzah,
  • Ooi Wei Ling,
  • Nur Najahatul Huda Saris,
  • Ahmad Haziq Aiman Rosol,
  • Sulaiman Wadi Harun

摘要

By contrasting the Q‑switched laser’s output characteristics with those of continuous wave all-fibre lasers, this study investigates how an erbium-doped all-fibre laser operates when it is passively Q‑switched and employs a tin sulfide (SnS) based saturable absorber. The modification of the laser’s Q‑factor and its impact on the repetition rate, output power, pulse width, and pulse energy have been studied. The findings demonstrated that at the necessary 1.5 µm wavelength, high-energy Q‑switched pulses were effectively produced within the pump power range of 105.26 mW to 160.4 mW, with repetition rates ranging from 40.19 to 45.67 kHz. At an input pump power of 160.4 mW, the Erbium-Doped Fibre Laser produced a pulse width of 5.18 µs and energy of 34.8 nJ. These findings suggest that SnS could be a promising SA for producing pulses in the 1.5 µm wavelength band.