2H-MoTe2-based passively Q-switched ytterbium-doped fiber laser

Q-switched Yb-doped fiber lasers based on 2H-MoTe₂ was demonstrated in this paper. The saturable absorber (SA) was a film mixed by 2H-MoTe₂ and polyvinyl alcohol (PVA). The modulation depth of the SA was 21.4% and the saturable optical intensity was 10.3 GW/cm^-2. When the 2H-MoTe₂ film was inserted into the cavity, the Q-switched pulses were obtained. To the best of our knowledge, this is the first time to realize the generation of Q-switching in a Yb-doped fiber laser based on 2H-MoTe_2-PVA film.