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Optical Engineering

Harmonic mode-locking and wavelength-tunable Q-switching operation in the graphene–Bi2Te3 heterostructure saturable absorber-based fiber laser
Author(s): Zhiteng Wang; Haoran Mu; Chujun Zhao; Qiaoliang Bao; Han Zhang
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Paper 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-SAwith 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.

Paper Details

Date Published: 25 February 2016
PDF: 8 pages
Opt. Eng. 55(8) 081314 doi: 10.1117/1.OE.55.8.081314
Published in: Optical Engineering Volume 55, Issue 8
Show Author Affiliations
Zhiteng Wang, Shenzhen Univ. (China)
Haoran Mu, Soochow Univ. (China)
Chujun Zhao, Hunan Univ. (China)
Qiaoliang Bao, Soochow Univ. (China)
Han Zhang, Shenzhen Univ. (China)

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