Chao Zeng’s research team experimentally demonstrate that indium selenide (In2Se3), a III-VI group layered chalcogenide compound. can be used as a saturable absorber (SA) for a wavelength-switchable vector-soliton fiber laser. The modulation depth of the In2Se3-based SA (In2Se3-SA), fabricated by incorporating In2Se3 nanosheets with polyvinyl alcohol, is up to 14%. By inserting the In2Se3-SA into fiber laser, solitons switched at wavelengths of similar to 1558 and similar to 1530 nm, with the duration of similar to 1.88 and similar to 1.76 ps respectively, can be obtained by adjusting the polarization controller and the pump power. Further investigations demonstrate that the achieved solitons arc polarization-locked vector conventional solitons, which reveals that the In2Se3 can serves as a polarization-independent SA. The results indicate that the III-VI group chalcogenide compounds, including In2Se3. could be developed as an alternative for ultrafast pulse generations, particularly, vector-soliton pulse.

（Original research article "Optical Materials Express Vol.9, Issue 2, pp. 449-456 (2019) https://www.osapublishing.org/ome/abstract.cfm?uri=ome-9-2-449"）