中文摘要：

研究了超短激光脉冲在氟化物光纤中的孤子自频移效应。当波长为1550nm的长脉冲光抽运氟化物光纤时，光纤中的调制不稳定性和脉冲传输时的孤子自频移效应，以及短波方向产生的色散波对脉冲的频谱演化起了重要作用。当输入脉冲为超短脉冲且孤子阶数较低时，输出频谱的变化主要受孤子自频移效应的影响。研究了飞秒脉冲抽运时脉冲峰值功率、初始啁啾及光纤长度等参数对孤子自频移效应的影响。通过改变1550nm抽运脉冲的峰值功率，可将氟化物光纤中最大红移拉曼孤子的中心波长调谐到2．6μm以上。利用氟化物光纤中的孤子自频移效应，结合特定波段的稀土掺杂光纤放大器，通过级联拉曼孤子自频移的方式可实现大波长范围的可调谐近中红外激光输出。

英文摘要：

The characteristics of soliton self frequency shift of ultra-short pulse propagation in fluoride fibers are investigated. Modulation instability, soliton self frequency shift and the dispersive waves generated in the short wavength direction play improtant roles in the spectral evolutions in fluoride fibers when pumped at 1550 nm. The output spectrum is mainly dominanted by soliton self frequency shift when the soliton order of the pump pulse is small. The effects of the length of fluoride fiber, peak power of pump pulse and initial chirp on soliton self frequency shift are discussed. By adjusting the peak power of the pump pulse at 1550 nm, the central wavelength of maximum red shifted Raman soliton can be tuned to above 2. 6/μm. Combined with some special rare earth doped fiber amplifiers, a widely tunable fluoride infrared fiber laser can be realized through the method of cascaded Raman soliton self frequency based on soliton self frequency shift effect in fluoride fibers.