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Howe, R. C. T.
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article
Wideband saturable absorption in few-layer molybdenum diselenide (MoSe2) for Q-switching Yb-, Er- and Tm-doped fiber lasers
Abstract
<p>We fabricate a free-standing molybdenum diselenide (MoSe<sub>2</sub>) saturable absorber by embedding liquid-phase exfoliated few-layer MoSe<sub>2</sub> flakes into a polymer film. The MoSe<sub>2</sub>-polymer composite is used to Q-switch fiber lasers based on ytterbium (Yb), erbium (Er) and thulium (Tm) gain fiber, producing trains of microsecond-duration pulses with kilohertz repetition rates at 1060 nm, 1566 nm and 1924 nm, respectively. Such operating wavelengths correspond to sub-bandgap saturable absorption in MoSe<sub>2</sub>, which is explained in the context of edge-states, building upon studies of other semiconducting transition metal dichalcogenide (TMD)-based saturable absorbers. Our work adds few-layer MoSe<sub>2</sub> to the growing catalog of TMDs with remarkable optical properties, which offer new opportunities for photonic devices.</p>