Observation of dynamic Stark resonances in strong-field excitation

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Chetty, D
Glover, RD
deHarak, BA
Tong, XM
Xu, H
Pauly, T
Smith, N
Hamilton, KR
Bartschat, K
Ziegel, JP
Douguet, N
Luiten, AN
Light, PS
Litvinyuk, I
Sang, RT
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2020
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Abstract

We investigate AC Stark-shifted resonances in argon with ultrashort near-infrared pulses. Using 30 fs pulses, we observe periodic enhancements of the excitation yield in the intensity regions corresponding to the absorption of 13 and 14 photons. By reducing the pulse duration to 6 fs with only a few optical cycles, we also demonstrate that the enhancements are significantly reduced beyond what is measurable in the experiment. Comparing these to numerical predictions, which are in quantitative agreement with experimental results, we find that even though the quantum state distribution can be broad, the enhancements are largely due to the efficient population of a select few AC Stark-shifted resonant states rather than the closing of an ionization channel. Because these resonances are dependent on the frequency and intensity of the laser field, the broad bandwidth of the 6 fs pulses means that the resonance condition is fulfilled across a large range of intensities. This is further exaggerated by volume-averaging effects, resulting in excitation of the

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Physical Review A
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LE160100027
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© 2020 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
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Atomic, molecular and optical physics
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Physical Sciences
Optics
Physics, Atomic, Molecular & Chemical
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Chetty, D; Glover, RD; deHarak, BA; Tong, XM; Xu, H; Pauly, T; Smith, N; Hamilton, KR; Bartschat, K; Ziegel, JP; Douguet, N; Luiten, AN; Light, PS; Litvinyuk, I; Sang, RT, Observation of dynamic Stark resonances in strong-field excitation, Physical Review A, 2020, 101 (5)
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