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1 引言 90年代末研制成近红外区振荡的极限脉冲宽度～5fs的Ti:蓝宝石激光器,重要的应用是以飞秒分辨率直接记录激光像(时间和强度线性变化)。自相关法要求预先知道脉冲形状,不能单值地判断飞秒
1 INTRODUCTION The Ti: sapphire laser with an ultimate pulse width of ~ 5fs developed in the near-infrared region in the late 1990s is an important application that records laser images directly at femtosecond resolution (time and intensity linearity). Autocorrelation law requires that the shape of the pulse be known beforehand, and it is impossible to judge the femtosecond by itself