几周期余弦-高斯激光脉冲的时间重心

Center of Time Gravity of Few-Cycle Cosine-Gauss Pulse

研究了几周期超短余弦-高斯脉冲的时间重心与绝对相位以及与余弦函数参量之间的关系.给出了几周期超短余弦-高斯脉冲时间重心的解析表达式和模拟图形.结果表明,余弦-高斯脉冲的时间重心随着绝对相位的变化而发生漂移,并且脉冲宽度对余弦-高斯脉冲时间重心的漂移量也有一定的影响.余弦函数的参量在一定取值范围内对余弦-高斯脉冲也有较大的影响,它可能导致几周期余弦-高斯脉冲的时间重心有较大的漂移.

The relations between the center of time gravity of the ultrashort cosine-Gauss pulse and the absolute phase, the parameter of the cosine function are studied. The analytical expression of the center of time gravity of the ultrashort cosine-Gauss pulse and some numerical simulation figures are given. The results show that the center of time gravity of the cosine-Gauss pulse varies with different absolute phases, and different pulse width also affects the center of time gravity. The parameter of the cosine function affects the center of time gravity of the cosine-Gauss pulse in a certain range, even for the cosine-Gauss pulse whose pulse width is longer than one optical oscillation period.