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arXiv · 1802.00710

Black phosphorus Q-switched and mode-locked Er:ZBLAN fiber lasers at 3.5 um

Zhipeng Qin·Ting Hai·Guoqiang Xie·Jingui Ma·Peng Yuan·Liejia Qian·Lei Li·Luming Zhao·Deyuan Shen
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Abstract

With the proposal of dual-wavelength pumping (DWP) scheme, DWP Er:ZBLAN fiber lasers at 3.5 um have become a fascinating area of research. However, limited by the absence of suitable saturable absorber, passively Q-switched and mode-locked fiber lasers have not been realized in this spectral region. Based on the layer-dependent bandgap and excellent photoelectric characteristics of black phosphorus (BP), BP is a promising candidate for saturable absorber near 3.5 um. Here, we fabricated a 3.5-um saturable absorber mirror (SAM) by transferring liquid-phase exfoliated BP flakes onto a gold-coated mirror. With the as-prepared BP SAM, we realized stable Q-switching and continuous-wave mode-locking operations in the DWP Er:ZBLAN fiber lasers at 3.5 um. To the best of our knowledge, it is the first time to achieve passively Q-switched and mode-locked pulses in 3.5 um spectral region. The research results will not only promote the development of 3.5-um pulsed fiber lasers but also open the photonic application of two-dimensional materials in this spectral region

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Zhipeng Qin, Ting Hai, Guoqiang Xie, Jingui Ma, Peng Yuan, Liejia Qian, Lei Li, Luming Zhao, Deyuan Shen. 2018-02-02. Black phosphorus Q-switched and mode-locked Er:ZBLAN fiber lasers at 3.5 um. https://doi.org/10.1364/oe.26.008224

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