Bloch-Siegert shifts and widths for multiphoton resonances: In-plane field configuration

Bloch-Siegert shifts and widths of resonances in two-level systems are evaluated within an adiabatic approximation applicable in the multiphoton regime. The level splitting is controlled by a static field. Most attention is paid to the case of a circular driving field with the static field in the pl...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2004-09, Vol.70 (3), Article 033413
Main Authors: Ostrovsky, V. N., Horsdal-Pedersen, E.
Format: Article
Language:English
Subjects:
ADIABATIC APPROXIMATION
ATOMIC AND MOLECULAR PHYSICS
ATOMS
CONFIGURATION
LEVEL WIDTHS
MULTI-PHOTON PROCESSES
PHOTONS
RESONANCE
ROTATION
RYDBERG STATES
SPECTRAL SHIFT
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Summary:Bloch-Siegert shifts and widths of resonances in two-level systems are evaluated within an adiabatic approximation applicable in the multiphoton regime. The level splitting is controlled by a static field. Most attention is paid to the case of a circular driving field with the static field in the plane of rotation. This nonconventional setup was used in a recent experiment on intrashell resonances in Rydberg atoms where shifts and widths for N-photon resonance with N as large as 23 were observed [D. Fregenal et al., Phys. Rev. A 69, 031401(R) (2004)]. For this in-plane configuration the resonance widths are drastically enhanced compared to their values in the conventional configuration (linearly polarized driving field perpendicular to static field), whereas the shifts are only weakly affected.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.70.033413