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2-μm Switchable dual-wavelength single-longitudinal-mode fiber laser based on a core-offset structure and carbon nanotube

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Abstract

In this paper, we demonstrate a switchable single-longitudinal-mode (SLM) dual-wavelength fiber laser in 2-μm region based on a core-offset structure and carbon nanotube (CNT). The switchability of the fiber laser is based on a core-offset structure which acts as a tunable filter, so that the laser can work in stable dual-wavelength operation or switch between two wavelengths by adjusting the curvature of the core-offset structure. 3.68 nm (1919.44–1923.12 nm) and 6.32 nm (1890.64–1896.96 nm) tuning range can be obtained by tuning FBGs, respectively. The wavelength shift is less than 0.08 nm, and the power variation is smaller than 0.5 and 1 dB at 1923 and 1897 nm, respectively. The SLM oscillation is guaranteed by the CNT, which works as the loss factor to realize SLM oscillation. Absorption of the CNT increases the lasing threshold of the laser, therefore only the stronger mode can get lasing and SLM emission can be obtained. The proposed fiber laser offers a convenient and low-cost design for switchable dual-wavelength fiber laser in 2-μm region which has potential application in fields of gas sensing, lidar, and so on.

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Acknowledgements

This work is supported by a Grant (Nos. 61275083, 61290315) from Natural Science Foundation of China. Besides, the authors thank Prof. Qizhen Sun for providing the FBGs.

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Authors and Affiliations

  1. School of Optical and Electronic Information, National Engineering Laboratory for Next Generation Internet Access System, Huazhong University of Science and Technology, No.1037 Luoyu Road, Wuhan, 430074, Hubei, China

    Enci Chen, Ping Lu, Wei Yang & Deming Liu

  2. Department of Electronics and Information Engineering, Huazhong University of Science and Technology, No.1037 Luoyu Road, Wuhan, 430074, Hubei, China

    Jiangshan Zhang

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  1. Enci Chen
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  2. Ping Lu
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Correspondence to Ping Lu.

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Chen, E., Lu, P., Yang, W. et al. 2-μm Switchable dual-wavelength single-longitudinal-mode fiber laser based on a core-offset structure and carbon nanotube. Appl. Phys. B 122, 285 (2016). https://doi.org/10.1007/s00340-016-6558-x

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