Revealing laser-coherent electron features using phase-of-the-phase spectroscopy
Revealing laser-coherent electron features using phase-of-the-phase spectroscopy
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DOI：
10.1088/1361-6455/ab69ab
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发表时间：
2019-11
期刊：
影响因子：
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通讯作者：
V. Tulsky;B. Krebs;J. Tiggesbäumker;Dieter Bauer
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文献类型：
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作者：
V. Tulsky;B. Krebs;J. Tiggesbäumker;Dieter Bauer
同相（PoP）光谱扩展到具有圆形反向旋转偏振的双色激光场。特别是，分析（双色）相位信息的高次谐波，以提取在复杂目标条件下拍摄的光电子光谱的激光相干部分。我们通过原理验证模拟来说明这一点，通过考虑在现实实验条件下（即有限数量的光电子发射事件）氦纳米液滴内的氩原子的强场电子发射。中性氦原子上的多次弹性散射会产生激光非相干背景，但 PoP 信号的高次谐波可以解决光电发射的相干贡献。
Phase-of-the-phase (PoP) spectroscopy is extended to two-color laser fields having a circularly counter-rotating polarization. In particular, the higher harmonics of the (two-color) phase information are analyzed in order to extract the laser-coherent part of the photoelectron spectra taken under complex target conditions. We illustrate this with a proof-of-principle simulation by considering strong-field electron emission from argon atoms within helium nanodroplets under realistic experimental conditions, i.e. a limited number of photoemission events. Multiple elastic scattering on neutral helium atoms creates a laser-incoherent background, but the higher harmonics of the PoP-signal allow to resolve the coherent contribution to the photoemission.