Journal
OPTICAL ENGINEERING
Volume 55, Issue 8, Pages -Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.OE.55.8.081314
Keywords
graphene-Bi2Te3 heterostructure; saturable absorber; fiber laser; short pulse
Categories
Funding
- National Natural Science Foundation of China [61222505, 51222208, 51290273, 61435010]
- 863 Program [2013AA031903]
- youth 973 program [2015CB932700]
- Natural Science Foundation of Guangdong Province of China [2014A030310416]
- China Postdoctoral Science Foundation [2015M572353]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20150525092941016, JCYJ20150625103619275]
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We have investigated the broadband saturable absorption property of graphene-Bi2Te3 heterostructures and demonstrated their applications for stable harmonic mode-locking operation in a Yb-doped fiber laser and wavelength-tunable Q-switching operation in an Er-doped fiber laser. The modulation depth of a graphene-Bi2Te3 heterostructure saturable absorber (G-Bi2Te3-SA) is dependent on the coverage of Bi2Te3 on the graphene. By using 15%-Bi2Te3-covered G-Bi2Te3-SA with a modulation depth of 23.28% and saturable intensity of 3.32 MW/cm(2), the harmonic mode-locked Yb-doped fiber laser outputs the mode-locked pulses with a pulse duration down to 189.94 ps, spectral bandwidth of 3.5 nm, and repetition rate of 79.13 MHz (21st order of the fundamental frequency). After inserting the G-Bi2Te3-SA with 85% coverage of Bi2Te3 on graphene into Er-doped fiber laser cavity, whose modulation depth and saturable intensity are about 40.79% and 12.48 MW/cm(2), respectively, the wavelength-tunable Q-switched pulse with tunable wavelength range over 13.2 nm has been obtained by adjusting the intracavity fiber filter. These results suggest that the graphene- Bi2Te3 heterostructure could serve as a high nonlinear photonic device for practical applications. (C) 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
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