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Multiphoton dynamics and resonance lineshapes in three-level systems: many-mode Floquet treatment

Kwanghsi Wang, Tak-San Ho and Shih-I Chu

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The authors present an exact treatment of two- and multiquantum transitions in three-level systems driven by two intense linearly polarised monochromatic fields based on the semiclassical many-mode Floquet theory developed recently. Further they extend the almost degenerate perturbation theory of Salwen (1955-6) to the two-mode Floquet Hamiltonian and obtain approximate analytical formulae for multiphoton transition probabilities, resonance bichromatic shifts and widths, and absorption lineshapes beyond the conventional rotating-wave approximation (RWA). Detailed comparison of the analytical, the RWA, and the exact results is given. Several novel features of multiphoton lineshape characteristics are pointed out.


PACS

32.80.Wr Other multiphoton processes

32.70.Cs Oscillator strengths, lifetimes, transition moments

31.15.xg Semiclassical methods

32.70.Jz Line shapes, widths, and shifts

31.15.xp Perturbation theory

Subjects

Atomic and molecular physics

Computational physics

Dates

Issue 23 (14 December 1985)



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