Synthesized Light Transients
Synthesized Light Transients
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DOI：
10.1126/science.1210268
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发表时间：
2011-10-14
期刊：
影响因子：
56.9
通讯作者：
Goulielmakis, E.
中科院分区：
文献类型：
--
作者：
Wirth, A.;Hassan, M. Th.;Goulielmakis, E.
操纵电子动力学要求电磁力可以被限制在亚飞秒时间间隔内并在其上进行控制。定制的光场瞬变可以提供这些力量。我们报道了用1.5倍频程三通道光场合成器产生跨越红外、可见光和紫外光频段的亚周场瞬变及其阿秒采样。为了证明其适用性，我们在单个波峰内场电离了氪原子，并发射了一个具有明确初始相的价壳电子波包。半周期场激发和阿秒探测揭示了原子尺度电子运动的精细细节，如瞬时隧穿速率、价壳波包的初始电荷分布、能级的阿秒动态位移(瞬时交流斯塔克位移)以及它的几飞秒相干振荡。
Manipulation of electron dynamics calls for electromagnetic forces that can be confined to and controlled over sub-femtosecond time intervals. Tailored transients of light fields can provide these forces. We report on the generation of subcycle field transients spanning the infrared, visible, and ultraviolet frequency regimes with a 1.5-octave three-channel optical field synthesizer and their attosecond sampling. To demonstrate applicability, we field-ionized krypton atoms within a single wave crest and launched a valence-shell electron wavepacket with a well-defined initial phase. Half-cycle field excitation and attosecond probing revealed fine details of atomic-scale electron motion, such as the instantaneous rate of tunneling, the initial charge distribution of a valence-shell wavepacket, the attosecond dynamic shift (instantaneous ac Stark shift) of its energy levels, and its few-femtosecond coherent oscillations.