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利用数值模拟的方法对飞秒激光脉冲中光波振荡一个周期内不同时刻的光场进行了计算、比较,获得了输出端平面内各空间点处光场的最大值及达到最大值时对应的时间,得到了探针近场的振幅和相位分布.在研究振幅分布的过程中发现,在探针输出端的有些区域振幅始终为零,即在光波振荡的一个周期内这些区域始终为相位奇异点;通过分析相位分布得到了相位奇异随时间的演化及相位奇异的特点.
The numerical simulation is used to calculate the light field in different periods of the light wave oscillation in the femtosecond laser pulse. By comparison, the maximum value of the light field at each space point in the output plane and the corresponding time , The amplitude and phase distribution of the near field of the probe were obtained.It was found that the amplitudes of some regions at the output of the probe were always zero during the study of the amplitude distribution and that these regions were always phase singular points during one period of light oscillation. By analyzing the phase distribution, the singularity of the phase singularity with time is obtained.