利用稳态相位点的方法研究了线性啁啾时空高斯脉冲传输过程中的相位特性,并在二阶近似的情况下讨论了其传输过程中的时空特性,两种方法从不同的侧面得出了相同的结论,即:时空高斯脉冲在传输的过程中,在无穷远处将退化为球面波,或者在旁轴近似的情况下退化为平面波。

The phase characteristics of the linear chirped laser pulse with Gaussian temporal and Gaussian spatial structure is studied by using the stable phase point method while propagating in vacuum. And under the second order approximation, its spatial and temporal characteristics are discussed. The conclustion from the two methods is that the Gaussian laser pulse will degenerate into a spherical wave or into a planar wave under the paraxial approximation in the very far distant while traveling in vacuum.