Abstract

We report passively $Q$-switched $\sim 2$ and $\sim 3\mathrm{\mu m}$ mid-infrared (MIR) solid-state lasers with a self-assembly solvothermal-synthesized ${\mathrm{Bi}}_2{\mathrm{Te}}_3/\text{graphene}$ heterostructure saturable absorber (SA) for the first time. Based on the oxidation resistance and high thermal conductivity of graphene, and large modulation depth of ${\mathrm{Bi}}_2{\mathrm{Te}}_3$ nanosheets, two high-performance $Q$-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 $\sim 2\mathrm{\mu m}$. The corresponding maximum pulse peak power was 91 W, which was much improved in comparison with the pure graphene-based 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 $\sim 3\mathrm{\mu m}$ solid-state lasers, as far as we know. Our results indicate that such a composite ${\mathrm{Bi}}_2{\mathrm{Te}}_3/\text{graphene}$ material is a promising SA for generating high-performance mid-infrared pulse lasers.

© 2017 Optical Society of America

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