Subcycle laser control and quantum interferences in attosecond photoabsorption of neon
Subcycle laser control and quantum interferences in attosecond photoabsorption of neon
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DOI：
10.1103/physreva.87.063413
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发表时间：
2013-06
影响因子：
2.9
通讯作者：
Xiaowei Wang;M. Chini;Yan Cheng;Yi Wu;X. Tong;Z. Chang
中科院分区：
文献类型：
--
作者：
Xiaowei Wang;M. Chini;Yan Cheng;Yi Wu;X. Tong;Z. Chang
原子在强红外激光场（10 13 W / cm 2）中的动力学会导致无场电子能级的实质性变化，这可以在短于激光周期的时间尺度上使用孤立的阿秒脉冲进行探测。在这里，我们测量了一个孤立的阿秒脉冲的瞬态吸收激光修饰的束缚态附近的第一电离阈值的氖。所观察到的吸收光谱的子周期变化的结果从激光诱导的交流斯塔克位移和不同的多光子激发途径之间的量子干涉。我们进一步证明了通过消除一个干扰途径来实验性地关闭量子干涉机制的能力。
The dynamics of an atom in a strong infrared laser field (10 13 W / cm 2 ) result in substantial changes to the field-free electronic energy levels, which can be probed on time scales shorter than the laser cycle using isolated attosecond pulses. Here, we measure the transient absorption of an isolated attosecond pulse by laser-dressed bound states of neon near the first ionization threshold. The observed subcycle changes in the absorption spectrum result from both laser-induced ac Stark shifts and from quantum interferences between different multiphoton excitation pathways. We further demonstrate the ability to experimentally turn off the quantum interference mechanism by eliminating one of the interfering pathways.