相干强共振laser脉冲导致在发射粒子光谱中可观察到的时域干扰
Coherent intense resonant laser pulses lead to interference in the time domain observable in the spectrum of the emitted particles
摘要：
本文讨论了由相干强短高频激光脉冲共振耦合的原子能级的动力学，并主张通过测量发射粒子的光谱来灵敏地探测这种动力学。它表明，该激光脉冲的时间包络引起的两个波发射的时间延迟相对于彼此在上升和下降侧的脉冲，在时域中的干扰。通过数值计算和解析分析一个共振激光脉冲作用下原子双光子连续电离的例子，我们认为这种动态干涉是强激光场光谱学中的普遍现象。发射的粒子不一定是光电子。我们的结果也可以解释已经研究过的共振俄歇效应的原子强烈的自由电子激光脉冲，也设想的实验中，光子发射。
英文摘要：
The dynamics of atomic levels resonantly coupled by a coherent and intense short high-frequency laser pulse is discussed and it is advocated that this dynamics is sensitively probed by measuring the spectra of the particles emitted. It is demonstrated that the time-envelope of this laser pulse gives rise to two waves emitted with a time delay with respect to each other at the rising and falling sides of the pulse, which interfere in the time domain. By computing numerically and analyzing explicitly analytically a show-case example of sequential two-photon ionization of an atom by resonant laser pulses, we argue that this dynamic interference should be a general phenomenon in the spectroscopy of strong laser fields. The emitted particles do not have to be photoelectrons. Our results allow also to interpret the already studied resonant Auger effect of an atom by intense free electron laser pulses, and also to envisage experiments in which photons are emitted.
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