▎ 摘　　要

We report passively Q-switched similar to 2 and similar to 3 mu mmid-infrared (MIR) solid-state lasers with a self-assembly solvothermalsynthesized Bi2Te3/graphene heterostructure saturable absorber (SA) for the first time. Based on the oxidation resistance and high thermal conductivity of graphene, and large modulation depth of Bi2Te3 nanosheets, two highperformance Q-switching lasers were realized. One is a Tm: YAP laser with a maximum average output power of 2.34 W and a pulse width of 238 ns at similar to 2 mu m. The corresponding maximum pulse peak power was 91 W, which was much improved in comparison with the pure graphenebased Tm laser. The other one is an Er: YSGG laser producing a pulse width of 243 ns, which is the shortest among the 2D SAs-based similar to 3 mu m solid-state lasers, as far as we know. Our results indicate that such a composite Bi2Te3/graphene material is a promising SA for generating high-performance mid-infrared pulse lasers. (C) 2017 Optical Society of America