Few-level models show that below-threshold harmonics from aligned molecules alternate phase by π for lower orders below a transition energy while remaining constant above it, and orthogonal two-level systems produce polarization that follows the driving field at low orders but mirrors it at higher.
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Phase structure of below-threshold harmonics in aligned molecules: a few-level model system
Few-level models show that below-threshold harmonics from aligned molecules alternate phase by π for lower orders below a transition energy while remaining constant above it, and orthogonal two-level systems produce polarization that follows the driving field at low orders but mirrors it at higher.