Effect of Doppler broadening on Autler-Townes splitting in the molecular cascade excitation scheme

Journal Article · Thu Nov 15 04:00:00 EST 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.053407· OSTI ID:21028027

Ahmed, E; Lyyra, A M ^[1]

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1. Department of Physics, Temple University, Philadelphia, Pennsylvania 19122 (United States)

Theoretical analysis of the Autler-Townes splitting pattern in a three-level cascade excitation of a Doppler-broadened sample reveals that the observed Autler-Townes splitting is not only a function of the coupling-laser Rabi frequency, as in the homogeneously broadened case, but can also strongly depend on the wavenumber ratio of the coupling and probe lasers. Utilizing a steady-state density matrix formalism, we derive exact expressions for the populations of the intermediate and upper levels for a homogeneously broadened system. In the limit of a weak probe field, analytical expressions for Doppler-broadened excitation spectra from the intermediate and upper levels are derived. Using these expressions, we investigate the critical role of Doppler broadening on the observation of Autler-Townes splitting and its asymptotic behavior as a function of the coupling Rabi frequency for counterpropagating and copropagating configurations for different wavenumber ratios of the lasers.

• OSTI ID: 21028027
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ASYMPTOTIC SOLUTIONS
CONFIGURATION
COUPLING
DENSITY MATRIX
DOPPLER BROADENING
EXCITATION
LASER RADIATION
SPECTRA
STARK EFFECT
STEADY-STATE CONDITIONS