In this work, we reported a new strategy to improve the nonlinear saturable absorption performance of magnetite (Fe₃O₄) nanoparticles (FONPs) via the compositional engineering with the Ti₃C₂ MXene in the near-infrared (NIR) region. Based on the DFT simulation, the band structures and work function were significantly modified by the Ti₃C₂ MXene doping. By using the open-aperture Z-scan technology, the nonlinear optical features of the FONPs@Ti₃C₂ nanocomposite were significantly improved, showing the great potential as the saturable absorber in the pulsed laser. With the nanocomposite as the saturable absorber, the passively Q-switched Nd:GdVO₄ lasers emitted much shorter pulse durations when compared with the pristine FONP saturable absorber. These findings indicated that FONPs@Ti₃C₂ heterostructure was a promising saturable absorber for the short pulse generation in the NIR region.

在这项工作中，我们报告了一种通过在近红外（NIR）区域进行Ti ₃ C ₂ MXene的成分工程来改善磁铁矿（Fe ₃ O ₄）纳米粒子（FONPs）的非线性饱和吸收性能的新策略。在DFT模拟的基础上，Ti ₃ C ₂ MXene掺杂显着改变了能带结构和功函数。通过使用开孔Z扫描技术，FONPs @ Ti ₃ C ₂的非线性光学特性纳米复合材料得到了显着改善，显示出在脉冲激光器中作为可饱和吸收剂的巨大潜力。与原始的FONP饱和吸收剂相比，以纳米复合材料作为可饱和吸收剂，被动调Q开关Nd：GdVO ₄激光器发出的脉冲持续时间短得多。这些发现表明，FONPs @ Ti ₃ C ₂异质结构是一种有希望的可饱和吸收体，可用于在NIR区域产生短脉冲。