Journal
OPTICS EXPRESS
Volume 24, Issue 13, Pages 14152-14158Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.014152
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Funding
- NRF of Korea - MEST [NRF-2013R1A1A2A10005230]
- Pioneer Research Center Program through the NRF of Korea - Ministry of Science, ICT & Future Planning [2011-0027920]
- Ajou University research fund [2015]
- Korea Institute of Science and Technology (KIST) [2E26140]
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We demonstrate an all-fiber Tm-doped soliton laser with high power by using a monolayer graphene saturable absorber (SA). Large area, uniform monolayer graphene was transferred to the surface of the side-polished fiber (SPF) to realize an in-line graphene SA that operates around 2 mu m wavelength. To increase the nonlinear interaction with graphene, we applied an over-cladding onto the SPF, where enhanced optical absorption at monolayer graphene was observed. All-fiber Tm-doped mode-locked laser was built including our in-line graphene SA, which stably delivered the soliton pulses with 773 fs pulse duration. The measured 3-dB spectral bandwidth was 5.14 nm at the wavelength of 1910 nm. We obtained the maximum average output power of 115 mW at a repetition rate of 19.31 MHz. Corresponding pulse energy was estimated to be 6 nJ, which is the highest value among all-fiber Tm-doped soliton oscillators using carbon-material-based SAs. (C)2016 Optical Society of America
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