著者

Wang Xiaowei Chini Michael Cheng Yan Wu Yi Tong Xiao-Min Chang Zenghu

出版者

The American Physical Society

雑誌

Physical review A (ISSN:10502947)

巻号頁・発行日

vol.87, no.6, pp.063413, 2013-06

被引用文献数

49 7

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The dynamics of an atom in a strong infrared laser field (1013 W/cm2) 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.