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本文使用重复频率为250 MHz、脉冲宽度为135 fs、最大功率为2.2 W的锁模掺镱光纤激光作为种子源,利用光子晶体光纤和自制的拉锥式单模光纤两种高非线性光纤研究了超连续光谱的产生特性,通过对比两种光纤的结构、色散等特性,分析了拉曼孤子、色散波及其他非线性效应对产生的超连续谱形状的影响,并均得到了大于一个倍频程的超连续光谱,特别是拉锥式单模光纤产生的超连续光谱,耦合效率达到60%,这为众多研究领域,尤其是光学频率梳的建立提供了实用的超连续光源.
In this paper, a mode-locked ytterbium-doped fiber laser with a repetition frequency of 250 MHz, a pulse width of 135 fs and a maximum power of 2.2 W was used as the seed source. Two kinds of highly nonlinear optical fibers, photonic crystal fiber and self-made tapered single mode fiber, By comparing the structure and dispersion of two kinds of optical fibers, the effects of Raman soliton, dispersion wave and other nonlinear effects on the shape of supercontinuum are analyzed. The supercontinuum spectrum, especially the supercontinuum generated by a single-mode fiber with a tapered cone, achieves a coupling efficiency of 60%. This provides a practical supercontinuum light source for many research fields, especially for the optical frequency comb.