Journal
NANOTECHNOLOGY
Volume 28, Issue 48, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aa9535
Keywords
transition metal dichalcogenides; molybdenum selenide; optical modulator Q-switched fiber lasers; nonlinear optical materials
Funding
- National Natural Science Foundation of China [61775146, 61575129, 61605122]
- China Postdoctoral Science Foundation [2015M582408]
- Guangdong Natural Science Foundation [2016A030310059, 2016A030310049]
- Shenzhen Science and Technology Project [JCYJ20160422103744090, JCYJ20160427105041864, KQJSCX20160226194031, JSGG20160429114438287]
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Transition metal dichalcogenides (TMDs) have been successfully used as broadband optical modulator materials for pulsed fiber laser systems. However, the nonlinear optical absorptions of exfoliated TMDs are strongly limited by their nanoflakes morphology with uncontrollable lateral size and thickness. In this work, we provide an effective method to fully explore the nonlinear optical properties of MoSe2. Large-area and high quality lattice MoSe2 grown by chemical vapor deposition method was adopted as an optical modulator for the first time. The large-area MoSe2 shows excellent nonlinear optical absorption with a large modulation depth of 21.7% and small saturable intensity of 9.4MWcm(-2). After incorporating the MoSe2 optical modulator into fiber laser cavity as a saturable absorber, a highly stable Q-switching operation with single pulse energy of 224 nJ is achieved. The large-area MoSe2 possessing superior nonlinear optical properties compared to exfoliated nanoflakes affords possibility for the larger-area two-dimensional materials family as high performance optical devices.
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