Harith Ahmad, Nur Hidayah Mansor, Muhamad Zharif Samion, Siti Aisyah Reduan
In this work, we demonstrate high-power mode-locked pulses in a double-clad erbium ytterbium-doped fiber laser (EYDFL) cavity using a saturable absorber with a structure of graded-index multimode fiber-step index multimode fiber-graded index multimode fiber (GIMF–SIMF–GIMF). Ultra-short pulses with a pulse duration of 2.32 ps and a repetition rate of 14.1 MHz with a center wavelength at 1543 nm were obtained. The measured signal-to-noise ratio was 54.5 dB. The highest average output power obtained was 322 mW when 8 W was pumped into the cavity. It has a pulse energy and peak power of 22.8 nJ and 9.84 kW respectively. The calculated peak power intensity was 15.4 GW/cm2. This is the first report that demonstrated a GIMF–SIMF–GIMF-based SA in an EYDFL cavity in generating a high energy and peak power mode-locked fiber laser. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
Photonics Research Centre, Universiti Malaya, Kuala Lumpur, 50603, Malaysia; Department of Physics, Faculty of Science, Universiti Malaya, Kuala Lumpur, 50603, Malaysia; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jalan Semarang 5, Malang, 65145, Indonesia