Abstract Mid-infrared (MIR) photonics has attracted tremendous interest because of its broad applications at atmospheric windows. In this work, we report high-performance MIR photonics based on large-scale and good-quality monolayer molybdenum disulfide (MoS2). The open-aperture Z-scan measurement on the nonlinear saturable absorption features shows that the as-grown monolayer MoS2 possesses a modulation depth of 26% and a low saturable intensity of 271 kW/cm2, enabling its application as an excellent saturable absorber for the MIR pulse generation. This is further evident by the measured high effective nonlinear absorption coefficient β eff (−16 cm/MW). In addition, the two-photon absorption coefficient and the nonlinear refractive index of monolayer MoS2 are also determined by the closed-aperture Z-scan technology. As an application, we demonstrate a passively Q-switched Tm,Ho:CaLu0.1Gd0.9AlO4 (Tm,Ho:CLGA) disordered crystal laser at 2.1 μm by using the monolayer MoS2 as the saturable absorber for the first time, producing a minimum pulse width of 765 ns and a pulse repetition rate of 36 kHz. Our results demonstrate that large-scale monolayer MoS2 is a promising candidate for the MIR photonic applications.

中文翻译：

---

用于中红外光子学的大规模单层二硫化钼 (MoS2)

摘要 中红外（MIR）光子学因其在大气窗口中的广泛应用而引起了极大的兴趣。在这项工作中，我们报告了基于大规模和高质量单层二硫化钼 (MoS2) 的高性能 MIR 光子学。对非线性可饱和吸收特征的开放孔径 Z 扫描测量表明，生长的单层 MoS2 具有 26% 的调制深度和 271 kW/cm2 的低饱和强度，使其可作为优异的可饱和吸收剂应用于MIR 脉冲生成。测得的高效非线性吸收系数 β eff (-16 cm/MW) 进一步证明了这一点。此外，单层MoS2的双光子吸收系数和非线性折射率也由闭孔径Z扫描技术决定。作为应用程序，我们首次使用单层 MoS2 作为可饱和吸收体，展示了 2.1 μm 的被动调 Q Tm,Ho:CaLu0.1Gd0.9AlO4 (Tm,Ho:CLGA) 无序晶体激光器，产生的最小脉冲宽度为 765 ns 和 36 kHz 的脉冲重复率。我们的结果表明，大规模单层 MoS2 是 MIR 光子应用的有希望的候选者。