Theoretical analysis of the phase shift measurement of lifetimes using monochromatic light

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Abstract
It is shown that, if one uses an essentially monochromatic but weakly modulated light source to excite atoms or molecules in a resonant way, the phase shift of the scattered light is strongly dependent on the strength of the excitation. However, for low values of the excitation strength, this dependence disappears but a result which differs by a factor of two from the result obtained for broad-band light excitation is found. In addition, the strength of the modulated component of the scattered light displays a resonant behaviour in the modulation frequency, this response being directly related to the well-known Autler-Townes effect.
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