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<p>We report the first demonstration of a Zn (II) Schiff base complex deposited onto a side-polished fiber (SPF) as a saturable absorber (SA) for soliton mode-locking in an erbium-doped fiber laser (EDFL). The complex was synthesized via a one-pot reflux condensation of 1,2-phenylenediamine and 2,4-dihydroxybenzaldehyde, followed by coordination with zinc (II) acetate, and subsequently dissolved in dimethyl sulfoxide solution. The mixed solution was drop-cast onto the SPF to harness the strong evanescent field interaction, forming an integrated all-fiber SA device. Incorporation of the device into a ring-cavity EDFL enabled stable soliton pulse generation at 1569.03&#xa0;nm, delivering 1.30&#xa0;ps pulses at a repetition rate of 1.91&#xa0;MHz. The laser exhibited a linear increase in output power, pulse energy, and peak power with pump power. At a pump power of 138.68&#xa0;mW, the pulse energy and peak power reached 1.96&#xa0;nJ and 1.51&#xa0;kW, respectively. These results demonstrate that the Zn (II)-complex-coated SPF serves as a novel, practical, and efficient SA for compact and power-scalable ultrafast fiber lasers.</p>

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Soliton mode-locked erbium-doped fiber laser employing a Zn(II) schiff base complex coated side-polished fiber saturable absorber

  • 期刊论文

  • 发表日期：

    2026年5月2日

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  • Nurul Izzah S. Wadi,
  • Aeriyn D. Ahmad,
  • A. A. Latiff,
  • Ahmad Shuhaimi A. Bakar,
  • Muhammad Ameerullah Sahudin,
  • Khairun Nasriah Azmi,
  • Muhammad Imran M. A. Khudus

摘要

We report the first demonstration of a Zn (II) Schiff base complex deposited onto a side-polished fiber (SPF) as a saturable absorber (SA) for soliton mode-locking in an erbium-doped fiber laser (EDFL). The complex was synthesized via a one-pot reflux condensation of 1,2-phenylenediamine and 2,4-dihydroxybenzaldehyde, followed by coordination with zinc (II) acetate, and subsequently dissolved in dimethyl sulfoxide solution. The mixed solution was drop-cast onto the SPF to harness the strong evanescent field interaction, forming an integrated all-fiber SA device. Incorporation of the device into a ring-cavity EDFL enabled stable soliton pulse generation at 1569.03 nm, delivering 1.30 ps pulses at a repetition rate of 1.91 MHz. The laser exhibited a linear increase in output power, pulse energy, and peak power with pump power. At a pump power of 138.68 mW, the pulse energy and peak power reached 1.96 nJ and 1.51 kW, respectively. These results demonstrate that the Zn (II)-complex-coated SPF serves as a novel, practical, and efficient SA for compact and power-scalable ultrafast fiber lasers.