H. Ahmad, M.U.M. Ithnahaini, M.Z. Samion
The high-power all-fiber femtosecond laser system demonstrated in this work operates at 1.5 µm. It uses core-offset nonlinear multimodal interference (NMI) as a saturable absorber (SA) that is integrated into a chirped-pulse amplification (CPA) configuration. The oscillator integrates an NMI-based SA that initiates mode-locking, which is then stretched and amplified to generate high-power, mode-locked pulses across all fiber-based configurations. The optimized CPA architecture operates at 1561 nm, with a 160 fs pulse width and a 13.9 MHz repetition rate, delivering a maximum average output power of 1.16 W. This configuration achieves a high peak power of 27.11 kW and a pulse energy of 4.34 nJ. © 2026 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
Photonics Research Centre, University of Malaya, Kuala Lumpur, 50603, Malaysia; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jalan Semarang 5, Malang, 65145, Indonesia; Universiti Kuala Lumpur British Malaysian Institute (UniKL BMI), Batu 8, Jalan Sungai Pusu Selangor, 53100, Malaysia; Institute of Advanced Studies, Universiti Malaya, Kuala Lumpur, 50603, Malaysia
