Two-Photon Absorption from a Phase Diffusing Laser Field
In this report, I will discuss a recent experiment  in which we measured the influence of field frequency fluctuations on unsaturated two-photon absorption. The statistical properties of the frequency fluctuations in this experiment are carefully controlled, and the laser lineshape is nearly Lorentzian. This experiment provides direct confirmation of theoretical results of MOLLOW  on the linewidth of two- photon absorption by a phase-diffusing field. This report is organized as follows. The first section presents the background of the experiment, including Mollow’s results for two-photon absorption from a phase diffusing field, and a simple extension of his work to include the effect of the finite correlation time of the fluctuations. The next unit describes the manner in which the experiment was conducted, and a discussion of the results appears in the final section.
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