通过在充氪(Kr)气体的空心Kagome光子晶体光纤中输入超短脉冲，产生中红外波段的色散波，并利用单向脉冲传输方程对色散波进行数值模拟和分析。主要探讨了两种输入脉冲：中心波长为1.4 μm的高斯型脉冲和在此基础上加入其双倍频叠加而产生的双色近锯齿波脉冲。两种情况下均产生了多个色散波，并符合相位匹配条件。为优化色散波，将近锯齿波作为抽运光。当充入光纤的Kr气体因抽运光压缩而二次电离时，已产生的色散波发生转换，变为新的更长波长的色散波。这种色散波现象可以通过等离子体修正的相位匹配条件来解释。深入探讨了中红外波段超短脉冲的产生机制以及色散波理论。

Dispersive waves of mid-infrared band generated when the ultrashort pulse is launched into hollow-core Kagome photonic crystal fiber filled with Krypton gas are numerically investigated with the unidirectional pulse propagation equation. Two types of input pulses are studied, including a Gaussian pump centered at 1.4 μm and a near-saw-tooth-shaped two-color pulse centered at 1.4 μm added with its second harmonic. Multiple dispersive waves are observed under the two situations which are in agreement with the phase-matching conditions. In order to optimize dispersive waves, the near-saw-tooth-shaped pulse is used as the pump pulse. The second ionization of Krypton gas filled in fiber is caused by pump pulse compression, so that the earlier-generated dispersive waves are converted to new ones at longer wavelengths. This observation is legitimately explained by the plasma corrected phase-matching condition. The mid-infrared ultrashort pulse generation and the dispersive wave theory are discussed.