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Few-layer MoS2 grown by chemical vapor deposition as a passive Q-switcher for tunable erbium-doped fiber lasers

Handing Xia, Heping Li, Changyong Lan, Chun Li, Jinbo Du, Shangjian Zhang, and Yong Liu

Open Access Open Access

Abstract

We report an erbium-doped fiber laser passively Q-switched by a few-layer molybdenum disulfide (MoS2) saturable absorber (SA). The few-layer MoS2 is grown by the chemical vapor deposition method and transferred onto the end-face of a fiber connector to form a fiber-compatible MoS2 SA. The laser cavity is constructed by using a three-port optical circulator and a fiber Bragg grating (FBG) as the two end-mirrors. Stable Q-switched pulses are obtained with a pulse duration of 1.92 μs at 1560.5 nm. By increasing the pump power from 42 to 204 mW, the pulse repetition rate can be widely changed from 28.6 to 114.8 kHz. Passive Q-switching operations with discrete lasing wavelengths ranging from 1529.8 to 1570.1 nm are also investigated by using FBGs with different central wavelengths. This work demonstrates that few-layer MoS2 can serve as a promising SA for wideband-tunable Q-switching laser operation.

© 2015 Chinese Laser Press

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Figures (6)
Fig. 1.
Fig. 1. (a) Experimental setup of the MoS2 Q-switched fiber laser; (b) Raman spectrum of as-grown few-layer MoS2; (c) photograph of a FC coated with few-layer MoS2.

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Fig. 2.
Fig. 2. Nonlinear transmission of few-layer MoS2 SA.

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Fig. 3.
Fig. 3. Oscilloscope traces of the Q-switched pulses under different pump powers Pp; (a) Pp=42  mW; (b) Pp=97  mW; (c) Pp=112  mW; (d) Pp=194  mW.

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Fig. 4.
Fig. 4. Typical characteristics of the Q-switched pulses emitted from the fiber laser at the pump power of 102 mW; (a) output optical spectrum; (b) oscilloscope trace of the Q-switched pulse train; (c) single-pulse profile; (d) RF spectrum.

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Fig. 5.
Fig. 5. (a) Pulse repetition rate and pulse duration versus incident pump power; (b) average output power and single-pulse energy versus incident pump power.

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Fig. 6.
Fig. 6. (a) Laser output spectra at different wavelengths by using different FBGs under a pump power of 102 mW. Inset, axial strain induced wavelength tuning; (b) pulse repetition rate and pulse duration as a function of the wavelength.

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