Femtosecond pulse erbium-doped fiber laser by a few-layer MoS sub(2) saturable absorber

We report on the generation of a femtosecond pulse in a fiber ring laser by using a polyvinyl alcohol (PVA)-based molybdenum disulfide (MoS sub(2)) saturable absorber (SA). With a saturable optical intensity of 34 MW/cm super(2) and a modulation depth of ~ 4.3%, the PVA-based MoS sub(2) SA had been...

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Bibliographic Details
Published in:Optics letters 2014-08, Vol.39 (15), p.4591-4594
Main Authors: Liu, Hao, Luo, Ai-Ping, Wang, Fu-Zao, Tang, Rui, Liu, Meng, Luo, Zhi-Chao, Xu, Wen-Cheng, Zhao, Chu-Jun, Zhang, Han
Format: Article
Language:English
Subjects:
Dispersions
Femtosecond pulses
Holes
Modulation
Molybdenum disulfide
Optical fibers
Pumps
Ring lasers
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Summary:We report on the generation of a femtosecond pulse in a fiber ring laser by using a polyvinyl alcohol (PVA)-based molybdenum disulfide (MoS sub(2)) saturable absorber (SA). With a saturable optical intensity of 34 MW/cm super(2) and a modulation depth of ~ 4.3%, the PVA-based MoS sub(2) SA had been employed with an erbium-doped fiber ring laser as a mode locker. The mode-locking operation could be achieved at a low pump threshold of 22 mW. A ~ 710 fs pulse centered at 1569.5 nm wavelength with a repetition rate of 12.09 MHz had been achieved with proper cavity dispersion. With the variation of net cavity dispersion, output pulses with durations from 0.71 to 1.46 ps were obtained. The achievement of a femtosecond pulse at 1.55 mu m waveband demonstrates the broadband saturable absorption of MoS sub(2), and also indicates that the filmy PVA-based MoS sub(2) SA is indeed a good candidate for an ultrafast saturable absorption device.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.39.004591