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

Zhiteng Wang; Haoran Mu; Chujun Zhao; Qiaoliang Bao; Han Zhang

doi:10.1117/1.OE.55.8.081314

25 February 2016 Harmonic mode-locking and wavelength-tunable Q-switching operation in the graphene–Bi₂Te₃ heterostructure saturable absorber-based fiber laser

Zhiteng Wang, Haoran Mu, Chujun Zhao, Qiaoliang Bao, Han Zhang

Author Affiliations +

Optical Engineering, Vol. 55, Issue 8, 081314 (February 2016). https://doi.org/10.1117/1.OE.55.8.081314

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.

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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," Optical Engineering 55(8), 081314 (25 February 2016). https://doi.org/10.1117/1.OE.55.8.081314

Published: 25 February 2016

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