Stable dual-wavelength thulium-doped fluoride fiber laser at S-band region with WS2 as birefringence element

In this work, the generation of dual-wavelength fiber laser at S-band region has been demonstrated with thulium-doped fluoride fiber as gain medium and WS2 thin film as a stabilizer. The generated dual-wavelength fiber laser is achieved in the simple ring cavity with WS2 acted as a birefringence element to suppress mode-hopping and mode competition. A stable dual wavelength fiber laser of spacing approximately 1.17 nm is achieved at the pump power of 76.44 mW. An OSNR of 31.9 dB and maximum peak power difference of 0.5 dB are attained at oscillating wavelengths of 1500.08 nm and 1501.25 nm. The proposed DWFL exhibits maximum wavelength drifting as low as 0.06 nm and 0.05 nm at 1500.8 08 nm and 15001.25 nm respectively. This indicates the WS2 is highly potential to be used in optoelectronics technology.