激光在厚介质传输中的光电离动力学过程研究

Research of the Dynamical Photoionization Process of Laser Traveling in a Thick Medium

研究了激光在厚介质中的传输特性以及激光与原子相互作用的光电离。推导了三步光电离的场方程组和原子布居的密度矩阵方程组。计算了在不同情况下电离几率与激光参数的变化关系。深入研究了激光在厚介质中传输引起激光参数的变化，以及激光功率、脉冲形状、脉冲宽度、三束激光的时间不同步对电离几率的影响。

This paper reports researches on the property of laser traveling in a thick medium and photoionization of laser atom interaction. The equation of three step photoionization for describing the field and the density matrix as well as the atomic population was derived. The ionization probability evolution with laser parameters is calculated in different cases. It was found that the laser transfer in a long distance causes evolution of laser parameters. Laser power, laser pulse shape, pulse width and time stepout of three laser bunches are the main factors of affecting the photoionization probability.