Ti₃CN, as a typical hetero-MXene, has attracted tremendous attention for its unique properties. However, its ultrafast photonics applications are still rare. Here, the few-layer Ti₃CN MXene was successfully prepared by selective etching and molecular delamination technique. The nonlinear optical response of few-layer Ti₃CN MXene at 640 nm was studied using the open-aperture Z-scan technique. The as-prepared Ti₃CN MXene sample exhibited excellent nonlinear saturable absorption characteristics, resulting in the nonlinear absorption coefficient β of −4.05 × 10^-2 cm/GW, which was one order of magnitude larger than that of black phosphorus (BP) and molybdenum disulfide (MoS₂). For the optical modulation applications of few-layer Ti₃CN MXene, passively Q-switched (PQS) solid-state visible lasers based on Ti₃CN saturable absorber (SA) at 522 nm, 607 nm, 639 nm, and 721 nm were successfully realized. Furthermore, a Ti₃CN-based stable passively mode-locked Pr:YLF red laser was also successfully achieved with a pulse duration of 30 ps, and the corresponding repetition rate was 73.1 MHz. The optical modulation device based on few-layer Ti₃CN MXene shows good performance. Our work demonstrates that the tremendous prospects of the few-layer Ti₃CN MXene as a visible optical modulation device in ultrafast photonics applications.