Manganese oxide nanosheets (MnO2 NSs) with two-dimensional formation and typically ultrathin thickness have gained a great deal of attention due to their excellent physical and chemical properties. However, the potential capability of MnO2 NSs in laser application has been rarely explored. Here, we first report the MnO2 NSs as the saturable absorber (SA) for generating Q-switched pulsed laser. The MnO2 NSs–based SA not only shows a broadband absorption, but also possesses nonlinear saturable absorption feature. By integrating the MnO2 NSs-SA into an erbium-doped fiber laser cavity, a stable passively Q-switched operation at central wavelength of ∼1558 nm was realized with a threshold pump power of 220 mW, and 1.26 μs pulse width with a repetition rate of 92.35 kHz was obtained. Our results indicate that the MnO2 NSs can serve as promising candidates for constructing optical pulsed lasers.

中文翻译：

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MnO2纳米片作为调Q光纤激光器的可饱和吸收体

具有二维形成和通常超薄厚度的氧化锰纳米片（MnO2 NSs）由于其优异的物理和化学性质而受到了极大的关注。然而，MnO2 NSs 在激光应用中的潜在能力很少被探索。在这里，我们首先报告了 MnO2 NSs 作为用于产生 Q 开关脉冲激光的可饱和吸收体 (SA)。基于 MnO2 NSs 的 SA 不仅表现出宽带吸收，而且还具有非线性可饱和吸收特性。通过将 MnO2 NSs-SA 集成到掺铒光纤激光器腔中，实现了中心波长为 1558 nm 的稳定被动调Q操作，阈值泵浦功率为 220 mW，脉冲宽度为 1.26 μs，重复频率获得了 92.35 kHz 的频率。