title: Synthesized light transients.
abstract: 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.
authors: Max-Planck-Institut für Quantenoptik (MPQ), Garching, Germany.
authors: A
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authors: Wirth
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authors: Hassan
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authors: Grguras
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authors: Gagnon
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authors: Moulet
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authors: Luu
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authors: Pabst
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authors: Santra
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authors: Azzeer
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authors: VS
authors: Yakovlev
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authors: Pervak
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authors: Krausz
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authors: Goulielmakis