Coherent Control of Atomic Excitation in Strong Fields

为了解决强激光场中任意原子的含时薛定谔方程，我们开发了一种更有效的数值方法。由于这是研究项目的第一年，我们不仅专注于开发模拟代码，而且还重写了代码，以便在最新的模拟加速器GPU机器上运行。我们还研究了整形激光脉冲或啁啾脉冲的描述以及利用啁啾脉冲控制原子动力学过程。所有这些进展保证了我们可以顺利进行拟议的研究。通过数值模拟，我们表明，由此产生的束缚态布居是敏感的强度和CEP。实验数据与理论预测一致，结果鼓励使用精确定制的激光场相干控制强场激发过程。我们发现一个显着不同的行为CEP依赖的束缚态人口在低强度和高强度有一个明确的边界，我们归因于从多光子隧穿制度的过渡。这项工作已发表在物理评论快报。这项工作使我们在这一研究领域处于领先地位。我们还与电子通信大学的一个实验小组合作，揭示了导致类铍高电荷离子出乎意料地大极化的物理机制。这项工作也发表在《物理评论快报》上。

We developed a more effective numerical method to solve the time-dependent Schrodinger equation for arbitrary atoms in an intense laser field.Since this was the first year of the research project, we focus on not only developing the simulation code, but also rewriting the code so it runs on the newest simulation accelerator, a GPU machine. We also worked on describing a shaped laser pulse or chirp pulse and using a chirped pulse to control atomic dynamical processes. All those progress guarantees that we can perform the proposed research smoothly. Through numerical simulations, we show that the resulting bound-state population is sensitive to both the intensity and the CEP. The experimental data agree with the theoretical prediction, and the results encourage the use of precisely tailored laser fields to coherently control the strong-field excitation process. We find a markedly different behavior for the CEP-dependent bound-state population at low and high intensities with a clear boundary, which we attribute to the transition from the multiphoton to the tunneling regime. This work has been published in Physical Review Letters. This work puts us in a leading position in this research field.We also collaborated with an experimental group at the University of Electro-Communications to uncover the physical mechanisms which lead to an unexpectedly large polarization of Be-like highly charged ions. This work was also published in Physical Review Letters.