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<p>This study demonstrates the generation of ultrafast picosecond mode-locked pulses in an erbium-doped fiber laser using a polyaniline–boron nitride (PANI–BN) nanocomposite as a saturable absorber (SA). The PANI–BN nanocomposite exhibits significant nonlinear optical absorption, with a modulation depth of 4.1%, and fast recovery dynamics, making it suitable for stable self-starting mode-locked operation. By incorporating the PANI–BN SA into the laser cavity, stable dissipative soliton pulses were successfully generated in the normal-dispersion regime. The laser operated at a central wavelength of 1531.4&#xa0;nm and produced stable pulses with a pulse duration of 2.8&#xa0;ps and a repetition rate of 1.86&#xa0;MHz. As the input pump power increased from 118.3 to 210.6 mW, the average output power increased from 4.60 to 8.08&#xa0;mW, corresponding to a slope efficiency of 10.1%. The maximum pulse energy obtained was 4.34 nJ at the highest pump power. In addition, the mode-locked pulse train exhibited a high signal-to-noise ratio of 66.24&#xa0;dB, indicating excellent operational stability and low amplitude fluctuations. The formation of dissipative solitons is attributed to the balance among normal cavity dispersion, nonlinearity, gain, and spectral filtering. The PANI–BN nanocomposite plays a key role in initiating and sustaining longitudinal mode phase locking through its intensity-dependent nonlinear absorption behavior. These results confirm that the PANI–BN nanocomposite is an effective and robust SA for generating stable ultrafast picosecond dissipative soliton pulses. This work highlights the potential of polymer-based nanocomposite materials for generating ultrashort pulses, which are important for various applications, including optical communications, precision metrology, and high-resolution spectroscopy.</p>

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Ultrafast picosecond mode-locked pulse with dissipative soliton generation using polyaniline boron nitride nanocomposite as saturable absorber

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Hasanain Naser Abd Ali,
  • Anas Abdul Latiff,
  • Aeriyn D. Ahmad,
  • Ucuk Darusalam,
  • Sulaiman Wadi Harun

摘要

This study demonstrates the generation of ultrafast picosecond mode-locked pulses in an erbium-doped fiber laser using a polyaniline–boron nitride (PANI–BN) nanocomposite as a saturable absorber (SA). The PANI–BN nanocomposite exhibits significant nonlinear optical absorption, with a modulation depth of 4.1%, and fast recovery dynamics, making it suitable for stable self-starting mode-locked operation. By incorporating the PANI–BN SA into the laser cavity, stable dissipative soliton pulses were successfully generated in the normal-dispersion regime. The laser operated at a central wavelength of 1531.4 nm and produced stable pulses with a pulse duration of 2.8 ps and a repetition rate of 1.86 MHz. As the input pump power increased from 118.3 to 210.6 mW, the average output power increased from 4.60 to 8.08 mW, corresponding to a slope efficiency of 10.1%. The maximum pulse energy obtained was 4.34 nJ at the highest pump power. In addition, the mode-locked pulse train exhibited a high signal-to-noise ratio of 66.24 dB, indicating excellent operational stability and low amplitude fluctuations. The formation of dissipative solitons is attributed to the balance among normal cavity dispersion, nonlinearity, gain, and spectral filtering. The PANI–BN nanocomposite plays a key role in initiating and sustaining longitudinal mode phase locking through its intensity-dependent nonlinear absorption behavior. These results confirm that the PANI–BN nanocomposite is an effective and robust SA for generating stable ultrafast picosecond dissipative soliton pulses. This work highlights the potential of polymer-based nanocomposite materials for generating ultrashort pulses, which are important for various applications, including optical communications, precision metrology, and high-resolution spectroscopy.