Journal
OPTICS EXPRESS
Volume 23, Issue 21, Pages 27509-27519Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.027509
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Funding
- National Natural Science Foundation of China [61575162, 61405161, 61377035, 61377055]
- 973 Program [2012CB921900]
- Fundamental Research Funds for the Central Universities [3102014JCQ01101]
- National Basic Research Program of China [2014CB931700]
- NSFC [21403109]
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Transition-metal dichalcogenides, such as tungsten disulfide (WS2) and molybdenium disulfide (MoS2), are highly anisotropic layered materials and have attracted growing interest from basic research to practical applications due to their exotic physical property that may complement graphene and other semiconductor materials. WS2 nanosheets are found to exhibit broadband nonlinear saturable absorption property, and saturable absorbers (SAs) are fabricated by depositing WS2 nanosheets on side-polished fibers. Attributing to the weak evanescent field and long interaction length, the WS2 nanosheets are not exposed to large optical intensity, which allows the SA to work at the high-power regime. The SAs are used to mode lock erbium- and ytterbium-doped fiber lasers with normal dispersion, producing trains of dissipative soliton at 1.55 and 1.06 mu m respectively. Simulations show that the bandgap of WS2 nanosheets decreases from 1.18 to 0.02 and 0.65 eV by introducing W and S defects respectively, which may contribute to the broadband saturable absorption property of the WS2. (C) 2015 Optical Society of America
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