大气窗口中红外超快光纤激光器在红外对抗等领域具有重要的应用价值。然而，此波段的氟化物光纤激光器存在着色散特性单一、锁模器件不成熟，以及非线性抑制技术不足三方面限制，制约了超短脉冲产生和放大的研究和应用。. 针对以上局限，本项目首次提出了基于同步泵浦混合锁模的中红外超快光纤激光器实现方案。通过在氟化物掺铒光纤之后熔接正常色散硫化物无源光纤，实现全光纤化色散补偿。进而在脉冲激光同步泵浦下，基于增益调制和交叉相位调制的共同作用，实现3.5μm中红外耗散孤子锁模脉冲。并基于同步泵浦技术所固有的谐波泵浦高重频锁模特性，抑制功率放大过程中的非线性效应，进而实现3.5μm超短脉冲的功率放大。. 本项目的开展将会提供一种实现中红外大气窗口波段的高稳定性、大功率超短脉冲光纤激光器的新思路和方法，可满足相关的应用需要，并实质性的推动中红外超快光纤激光技术的发展。

The mid-infrared ultrafast fiber laser at the atmospheric window has important application value in the field of infrared countermeasures. However, the fluoride fiber laser in this band has single anomalous dispersion, the immaturity of the mode-locked device, and the limitation of the nonlinear suppression technology, which restricts the research and application of ultrashort pulse generation and amplification.. To overcome the above limitations, this project firstly proposed a mid-infrared ultrafast fiber laser based on synchronously pumped hybrid mode-locking technology. By directly splicing a sulfide passive fiber with the erbium-doped fluoride fiber, all-fiber dispersion compensation could be firstly achieved in laser cavity. And then, under the synchronous pumping with pulsed fiber laser, the 3.5μm mid-infrared dissipative soliton mode-locked pulses would be generated with high stability and suitable for power amplification, based on the synergistic effect of gain modulation and cross-phase modulation. Based on the harmonic pumping-based high repetition rate amplification inherent in synchronous pumping technology, the nonlinear effect in the power amplification process is suppressed, and the power amplification of 3.5μm ultrashort pulse is realized.. The achievement of this project will provide a new method for realizing the high-stability high-power mid-infrared ultrashort pulsed fiber laser at the atmospheric window, which can meet the requirements for relevant application and substantially promote the discipline development of mid-infrared ultrafast laser