Q switched fiber laser operating at 1.5 μm based on WTe2

Compared with the extensively studied MoS2 and WS2, WTe2 owns a smaller bandgap, which is applicable to a near-infrared system in photodetectors, communications, and ultrafast optics. In this work, the WTe2 saturable absorber (SA) with the tapered fiber structure is prepared by the magnetron-sputter