论文标题
合奏平均原子动力学在波动激光场中的扰动理论
Perturbative theory of ensemble-averaged atomic dynamics in fluctuating laser fields
论文作者
论文摘要
我们已经开发了一种扰动方法，以在波动的激光场中对原子系统的谐振电离进行建模。扰动方法是基于多时间累积物的扩展，即矩（场相干函数）的合适组合，用于表示场地的统计属性。二阶截断扩展是根据辐射的功率谱和强度自相关函数表示的。我们根据田地的相干时间长度和峰强度研究了模型的有效性范围，并将结果与常规的蒙特卡罗计算进行了比较。在使用Sase Fel脉冲具有正方形依赖性一阶相干函数的SASE FEL脉冲的氦2S2P自动化状态的近乎谐振的电离时，我们应用了该理论。电离线形配置文件获得了Voight配置文件；高斯或洛伦兹特征的程度至关重要地依赖于田间的连贯性时间。
We have developed a perturbative method to model the resonant ionization of atomic systems in fluctuating laser fields. The perturbative method is based on an expansion in terms of the multitime cumulants, a suitable combination of moments (field's coherence functions), used to represent the field's statistical properties. The second-order truncated expansion is expressed in terms of the radiation's power spectrum and the intensity autocorrelation function. We investigate the range of validity of the model in terms of the field's coherence temporal length and peak intensity and have compared the results with conventional Monte-Carlo calculations. We apply the theory in the case of a near-resonant ionization of the Helium 2s2p autoionizing state with a SASE FEL pulse with square-exponentially dependent 1st-order coherence function. The ionization lineshape profile acquires a Voight profile; the degree of the Gaussian or Lorentzian character of which to depend crucially on the field's coherence time.
