Phase-dependent decoherence of optical transitions in Pr3+:LaF3 in the presence of a driving field
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The decoherence times of orthogonally phased components of the optical transition dipole moment in a two-level system have been observed to differ by an order of magnitude. This phase anisotropy is observed in coherent transient experiments where an optical driving field is present during extended periods of decoherence. The decoherence time of the component of the dipole moment in phase with the driving field is extended compared to T_2, obtained from two-pulse photon echoes, in analogy with the spin locking technique of NMR.
5 pages, 2 figures; replaced with published version
5 pages, 2 figures; replaced with published version