In recent years, MXene has become a hotspot because of its good conductivity, strong broadband absorption, and tunable band gap. In this contribution, 0D MXene Ti₃C₂T_x quantum dots are synthesized by a liquid exfoliation method and a wideband nonlinear optical response from 800 to 1550 nm is studied, which have a larger nonlinear absorption coefficient β of –(11.24 ± 0.14) × 10^–2 cm GW^–1. The carrier dynamic processes of 0D MXene are explored with ultrahigh time resolution nondegenerate transient absorption (TA) spectroscopy, which indicates that the TA signal reaches its maximum in 1.28 ps. Furthermore, 0D MXene is used to generate ultrashort pulses in erbium or ytterbium‐doped fiber laser cavity. High signal‐to‐noise (72 dB) femtosecond lasers with pulse durations as short as 170 fs with spectrum bandwidth of 14.8 nm are obtained. Finally, an ultranarrow fiber laser based on 0D MXene is also investigated and has a full width at half maximum of only 5 kHz, and the power fluctuation is less than 0.75% of the average power. The experimental works prove that 0D MXene is an excellent SA and has a promising application in ultrafast and ultranarrow photonics.

中文翻译：

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基于零维MXene的光学器件，用于超快和超窄光子学应用

近年来，MXene由于其良好的导电性，强大的宽带吸收能力和可调节的带隙而成为热点。在此贡献中，通过液体剥落方法合成了0D MXene Ti ₃ C ₂ T _x量子点，并研究了800至1550 nm的宽带非线性光学响应，其非线性吸收系数β为–（11.24±0.14） ×10 ^–2厘米毛重^–1。利用超高分辨率的非简并瞬态吸收（TA）光谱技术研究了0D MXene的载流子动力学过程，这表明TA信号在1.28 ps内达到最大值。此外，0D MXene用于在掺or或掺fiber光纤激光器腔中产生超短脉冲。获得了高信噪比（72 dB）飞秒激光器，其脉冲持续时间短至170 fs，光谱带宽为14.8 nm。最后，还研究了一种基于0D MXene的超窄光纤激光器，该激光器的半高全宽仅为5 kHz，功率波动小于平均功率的0.75％。实验证明，0D MXene是一种出色的SA，在超快和超窄光子学中具有广阔的应用前景。