Abstract

We have prepared the graphene/MoS₂ heterostructure by a hydrothermal method, and presented its nonlinear absorption parameters and application as a nonlinear optical modulator in the mid-infrared region. Using the nonlinear optical modulator, stable passively Q-switched operation of an Er³⁺-doped ZrF₄-BaF₂-LaF₃-AlF₃-NaF (ZBLAN) fiber laser at ∼2.8 μm can be obtained. The Q-switched Er³⁺-doped ZBLAN fiber laser can yield per-pulse energy up to 2.2 μJ with the corresponding pulse width and pulse repetition rate of 1.9 μs and 45 kHz, respectively. Our results indicate that the graphene/MoS₂ heterostructure can be a robust optical modulator for pulsed lasers in the mid-infrared spectral range.

© 2018 Chinese Laser Press

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