Abstract

Materials in the transition metal dichalcogenide family, including WS₂, MoS₂, WSe₂, and MoSe₂, etc., have captured a substantial amount of attention due to their remarkable nonlinearities and optoelectronic properties. Compared with WS₂ and MoS₂, the monolayered MoTe₂ owns a smaller direct bandgap of 1.1 eV. It is beneficial for the applications in broadband absorption. In this letter, using the magnetron sputtering technique, MoTe₂ is deposited on the surface of the tapered fiber to be assembled into the saturable absorber. We first implement the MoTe₂-based Q-switched fiber laser operating at the wavelength of 1559 nm. The minimum pulse duration and signal-to-noise ratio are 677 ns and 63 dB, respectively. Moreover, the output power of 25 mW is impressive compared with previous work. We believe that MoTe₂ is a promising 2D material for ultrafast photonic devices in the high-power Q-switched fiber lasers.

© 2018 Chinese Laser Press

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