用实际波形实现光电子发射的最优控制
Optimal control of photoelectron emission by realistic waveforms
摘要：
最近的实验技术在飞秒波形合成允许强飞秒激光脉冲的时间整形与应用在原子，分子和纳米结构的量子力学过程的控制。最佳波形的形状的预测可以使用量子最佳控制理论（QOCT）计算地完成。本文研究了一维氢模型阈上光电发射的脉冲控制，通过混合不同的光谱通道，降低对单个通道的强度要求，得到的最佳脉冲可以使截止能量至少提高50%，电子产额提高几个数量级。深入了解优化的光电子发射的电子动力学与半经典两步模型。
英文摘要：
Recent experimental techniques in multicolor waveform synthesis allow the temporal shaping of strong femtosecond laser pulses with applications in the control of quantum mechanical processes in atoms, molecules, and nanostructures. Prediction of the shapes of the optimal waveforms can be done computationally using quantum optimal control theory (QOCT). In this work we demonstrate the control of above-threshold photoemission of one-dimensional hydrogen model with pulses feasible for experimental waveform synthesis.By mixing different spectral channels and thus lowering the intensity requirements for individual channels, the resulting optimal pulses can extend the cutoff energies by at least up to 50\% and bring up the electron yield by several orders of magnitude. Insights into the electron dynamics for optimized photoelectron emission are obtained with a semiclassical two-step model.
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