FePS3-coated arc-shaped fiber as saturable absorber for mode-locked pulsed laser generation at 2.0 mu m spectral region

• Main Authors: Ahmad, Harith, Azam, Azim Danial, Yusoff, Norazriena, Samion, Muhamad Zharif, Reduan, Siti Aisyah
• Format: Article
• Published: Springer 2022
• Subjects: Q Science (General)
• Online Access: http://eprints.um.edu.my/41039/

The performance of FePS3 as a saturable absorber (SA) for generating mode-locked pulses in a Thulium-Holmium co-doped fiber (THDF) laser via the evanescent field interaction was demonstrated in this work. FePS3 solution was drop-casted onto an arc-shaped fiber prepared using the polishing method. The fabricated FePS3/Arc-shaped SA exhibits nonlinear optical absorption behavior with modulation depth, saturation intensity, and non-saturable loss of 15.12%, 0.015 MW/cm(2), and 84.88%, respectively. Upon integrating the FePS3/Arc-shaped SA into the THDF ring cavity, mode-locking pulses were produced at a central wavelength of 1910.06 nm with a 3-dB bandwidth of 2.46 nm and a pulse width of 1.66 ps. At a pump power of 274.3 mW, the generated pulsed laser demonstrates a signal-to-noise ratio of 50 dB at a fundamental frequency of 11.37 MHz. The maximum average output power produced was 3.16 mW at pump power 449.9 mW, with the highest peak power and pulse energy of 0.17 kW and 277.92 pJ, respectively. The interaction between evanescent wave and FePS3 enhances the optical interaction and provides a damage threshold of higher than 4.65 GW/cm(2), giving a better laser performance. The finding of this work shed light on the applicability of a new group of 2-dimensional material as reliable SA material for pulsed laser generation and other potential photonics applications.