Soliton mode-locked thulium-doped fiber laser with cobalt oxide saturable absorber

• Main Authors: Ahmad, Harith, Samion, Muhamad Zharif, Yusoff, Norazriena
• Format: Article
• Published: Elsevier 2018
• Subjects: Q Science (General); QC Physics
• Online Access: http://eprints.um.edu.my/22679/; https://doi.org/10.1016/j.yofte.2018.07.012

In this work, we propose and demonstrate a mode-locked thulium doped fiber laser (TDFL) with an integrated cobalt oxide (Co3O4) saturable absorber (SA). The SA is fabricated by suspending Co3O4 nanosheets in a polymer film before being secured between two fiber ferules. The laser operates in the anomalous dispersion regime, confirmed by the Kelly sidebands observed in the obtained optical spectrum. Mode-locking operation is obtained at a low threshold pump power of 77.32 mW, with further optimizations made using a polarization controller The laser generates pulses with a repetition rate of 11.36 MHz and a pulse width of 1.39 ps. The generated pulses are highly stable, with a high signal-to-noise ratio of 46.00 dB and minimum power fluctuations indicating a long-term stability. This work demonstrates a simple and a low-cost laser that would have potential applications for operation near the 2.0-µm region, especially for medical applications.