M.A.M. Lutfi, H. Ahmad, M.K.A. Zaini, N.A.M. Rusni, I.S. Imaduddin, M.Z.H. Mayzan, I.A. Zuzamri, Mousa Hussein, Z. Mahmoodin, S. Sun
A high-power mode-locked laser source was demonstrated using an all-fibre ytterbium-doped fibre laser. The system comprises several preamplifiers, an acousto-optic-based pulse picker, and a large-mode-area double-clad fibre as the main amplifier. Mode-locking was achieved in a ring cavity configuration using bismuth nanoparticles/N-doped carbon (BiNP/NC) as the saturable absorber. A side-polished fibre was used as the host for material deposition to provide a saturable absorption mechanism. Nonlinear measurements show a high modulation depth of 17.3%, a saturation intensity of 18.2 MW cm−2, and a nonsaturable loss of 42.9%. A dissipative soliton was generated on the laser output centred at 1029 nm, with a repetition rate of 16.6 MHz. The pulse repetition rate was reduced to 1.03 MHz, after which the pulses were amplified to increase the single-pulse energy. Finally, the whole system has generated mode-locked pulses at an average optical power of 5.0 W, with a pulse duration of 17.7 ps, a pulse energy of 4.9 μJ, and a peak optical power of 277 kW. © 2026 Elsevier Inc.
Photonics Research Centre, Universiti Malaya, Kuala Lumpur, 50603, Malaysia; Institute for Advanced Studies, Universiti Malaya, Kuala Lumpur, 50603, Malaysia; Universiti Kuala Lumpur British Malaysian Institute (UniKL BMI), Batu 8, Jln Sungai Pusu, Selangor, 53100, Malaysia; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jalan Semarang 5, Malang, 65145, Indonesia; Centre for Ionics Universiti Malaya, Department of Physics, Faculty of Science, Universiti Malaya, Kuala Lumpur, 50603, Malaysia; Department of Physics, Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn Malaysia, Johor, Pagoh, 84600, Malaysia; Department of Electrical and Communication Engineering, United Arab Emirates University, Al Ain, United Arab Emirates; Shandong Provincial Key Laboratory of High-end Laser Manufacturing Technology and Equipment, Qingdao University of Technology, Qingdao, 266520, China
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