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• W1992831271 abstract "Exact and asymptotic line shape expressions are derived from the semiclassical density matrix representation describing a set of closed three-level $ensuremath{Lambda}$ atomic or molecular states including decoherences, relaxation rates, and light shifts. An accurate analysis of the exact steady-state dark-resonance profile describing the Autler-Townes doublet, the electromagnetically induced transparency or coherent population trapping resonance, and the Fano-Feshbach line shape leads to the linewidth expression of the two-photon Raman transition and frequency shifts associated to the clock transition. From an adiabatic analysis of the dynamical optical Bloch equations in the weak field limit, a pumping time required to efficiently trap a large number of atoms into a coherent superposition of long-lived states is established. For a highly asymmetrical configuration with different decay channels, a strong two-photon resonance based on a lower states population inversion is established when the driving continuous-wave laser fields are greatly unbalanced. When time separated resonant two-photon pulses are applied in the adiabatic pulsed regime for atomic or molecular clock engineering, where the first pulse is long enough to reach a coherent steady-state preparation and the second pulse is very short to avoid repumping into a new dark state, dark-resonance fringes mixing continuous-wave line shape properties and coherent Ramsey oscillations are created. Those fringes allow interrogation schemes bypassing the power broadening effect. Frequency shifts affecting the central clock fringe computed from asymptotic profiles and related to the Raman decoherence process exhibit nonlinear shapes with the three-level observable used for quantum measurement. We point out that different observables experience different shifts on the lower-state clock transition." @default.
• W1992831271 created "2016-06-24" @default.
• W1992831271 creator A5034864898 @default.
• W1992831271 creator A5041982063 @default.
• W1992831271 creator A5080294326 @default.
• W1992831271 date "2011-12-02" @default.
• W1992831271 modified "2023-10-18" @default.
• W1992831271 title "Ultrahigh-resolution spectroscopy with atomic or molecular dark resonances: Exact steady-state line shapes and asymptotic profiles in the adiabatic pulsed regime" @default.
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• W1992831271 doi "https://doi.org/10.1103/physreva.84.062502" @default.
• W1992831271 hasPublicationYear "2011" @default.
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