The fluctuations of the source frequency are shown to be responsible of an extra damping of the optical precession and of the photon echoes observed in the experiments involving many shots and an averaging of the detected signals. Assuming a phase diffusing model and various profiles for the frequency power spectrum, the r.m.s. accumulated phase error is calculated and two asymptotic behaviours are pointed out according to the relative values of the sequence duration and of the frequency correlation time. The calculation is well supported by a photon echo experiment at a 3-mm wavelength.
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Rohart, F., Macke, B. Influence of the source bandwidth on the observation of microwave photon echoes. Appl. Phys. B 26, 23–30 (1981). https://doi.org/10.1007/BF00702682
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