Special Section on 2-D Materials for Optics and Photonics

Harmonic mode-locking and wavelength-tunable Q-switching operation in the graphene–Bi2Te3 heterostructure saturable absorber-based fiber laser

[+] Author Affiliations
Zhiteng Wang, Han Zhang

Shenzhen University, College of Optoelectronic Engineering, SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen 518060, China

Haoran Mu, Qiaoliang Bao

Soochow University, College of Physics and Microelectronic Science, Institute of Functional Nano and Soft Materials, Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou 215123, China

Chujun Zhao

Hunan University, College of Physics and Microelectronic Science, Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, Changsha 410082, China

Opt. Eng. 55(8), 081314 (Feb 25, 2016). doi:10.1117/1.OE.55.8.081314
History: Received November 26, 2015; Accepted February 4, 2016
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Abstract.  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/cm2, 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/cm2, 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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Zhiteng Wang ; Haoran Mu ; Chujun Zhao ; Qiaoliang Bao and Han Zhang
"Harmonic mode-locking and wavelength-tunable Q-switching operation in the graphene–Bi2Te3 heterostructure saturable absorber-based fiber laser", Opt. Eng. 55(8), 081314 (Feb 25, 2016). ; http://dx.doi.org/10.1117/1.OE.55.8.081314


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