等谱宽脉冲高斯光束的载波相位漂移

采用复 q 参量法对啁啾脉冲高斯光束在自由空间中的传输进行了分析.在啁啾脉冲光束谱宽相等的条件下,采用数值方法,分别研究了其载波相位在传播方向与径向上的漂移情况.研究表明:在光轴上远场,载波相位漂移量趋近于-π/2;在原点附近,存在一个近线性分布区间,其变化率与瑞利长度成反比;介于两者之间,正啁啾使载波相位有更大的漂移,而负啁啾的作用与之相反.在径向方向上,啁啾系数越大,载波相位漂移量越大,变化越快,且其经历0点的位置也更靠近光轴.

Carrier Envelope Phase Sliping of Pulsed Gaussian Beams with Constant Spectrum Width

The complex q parameter method is used to analyse the propagation of the chirped pulsed Gaussian beam in the free space. The shiftings of the carrier envelope phase on the axis and on the radial direction are studied by adopting the simulation methods. The results show that the carrier envelope phase on the axis is trend to - π/2 in the far field. There exists an inverse relation between the CEP and the propagation distance near the original point. And from the near field to the far field, the CEP varies significantly with the increase of the positive coefficient. Along the radial direction, the bigger the chirped coefficient is, the bigger the CEP is.