氟化物光纤锁模激光器近年来已经发展成为一种新兴的中红外超快光源，但激光器的输出能量已经达到孤子锁模机制的理论极限。为突破这一限制，本项目拟采用半导体进行腔内色散管理，以实现锁模激光器从孤子域到耗散孤子域的过渡，为中红外脉冲能量和峰值功率提升创造可能。具体研究内容包括三个方面：（1）筛选具有强正群速度色散（为常规材料几十倍）的半导体材料，为腔内色散管理创造条件；（2）基于耦合Ginzburg-Landau方程组对色散管理氟化物光纤锁模激光器进行数值仿真，研究色散管理对耗散孤子动力学演化和脉冲性能的影响；（3）采用非线性偏振旋转锁模技术，实验验证耗散孤子锁模氟化物光纤激光器。通过半导体材料进行色散管理，氟化物光纤锁模激光器的峰值功率有望突破百千瓦，从而助推中红外超快激光在分子光谱学、材料加工等方面的应用。

In recent years, mode-locked fluoride fiber lasers have been developed into a newly-emerged route to produce the mid-infrared ultrafast sources, however, the output energy from these lasers has been limited theoretically by the soliton area theorem. In order to overcome this limitation, this project is planned to transform the mode-locked fluoride fiber lasers from the soliton to dissipative soliton regime through intracavity dispersion management with infrared semiconductor, which can open the door to the improvement of the peak power and pulse energy. The detailed research contents are as follows. First of all, we need to filter the mid-infrared semiconductors with strongly positive dispersion, which is dozens of times that of conventional material, to create the condition for the intracavity dispersion management. And then, based on the coupled Ginzburg-Landau equations, we plan to simulate the mode-locked fluoride fiber laser and exploit the effect of dispersion management on the evolution of dissipative soliton and pulse performance. Finally, using nonlinear polarization rotation technique, we plan to conduct a dissipative-soliton mode-locked fluoride fiber laser. After managing the intracavity dispersion with an infrared semiconductor, the peak power of mode-locked fluoride fiber is expected to exceed 100s kW, which is beneficial to promote the application of mid-infrared ultrafast lasers in molecular spectroscopy, material processing, etc.