Nonperturbative treatments of level shifts of excited states and high-order harmonic generation in strong fields
Issue Date
1990-01-01Author
Chu, Shih-I
Wang, Kwanghsi
Layton, Eric
Publisher
Optical Society of America
Type
Article
Article Version
Scholarly/refereed, publisher version
Metadata
Show full item recordAbstract
In this paper we accomplish three goals. First, we present new nonperturbative results of complex quasi-energies (shifts and widths) for several low-lying excited states of atomic H in strong fields, using the L2 non-Hermitian Floquet matrix technique. Second, we present a new nonperturbative L2 technique for the treatment of ac Stark shifts of arbitrary excited states. We found that all the Rydberg states in weak fields are upshifted and closely follow the quadratic field dependence described by the ponderomotive potential e2F2/4mω2. Large deviation from the ponderomotive shift and intricate level-shift behaviors, however, occur in strong fields. Finally, we present a classical nonperturbative treatment of the electronic motion in intense laser fields. We show that the spectral analysis of classical trajectories can provide detailed insights regarding the mechanisms responsible for the multiple-harmonic generation recently observed in high-intensity experiments.
Description
This is the published version, also available here: http://dx.doi.org/10.1364/JOSAB.7.000425.
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Citation
Shih-I Chu, Kwanghsi Wang, and Eric Layton, "Nonperturbative treatments of level shifts of excited states and high-order harmonic generation in strong fields," J. Opt. Soc. Am. B 7, 425-432 (1990) http://dx.doi.org/10.1364/JOSAB.7.000425.
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