Dynamics of superradiant medium in resonator

Phase memory in conditions of optical instability development

“…In the present paper, it has been proved that the conditions of experiments [10][11][12][13][14][15][16] are sufficient for retaining the phase memory in spite of instability development in the form of a superradiance pulse at the 3 P 0 -3 H 6 transition. It is shown how the retained phase memory may manifest itself in the experiment.…”

“…This emission prevents the echo signal formation. A detailed experimental study of this emission was performed in two groups [11][12][13][14][15][16]. They associated the emission observed with the superradiation phenomenon.…”

“…They associated the emission observed with the superradiation phenomenon. That it was impossible to observe the two-pulse echo under the conditions of experiments [10][11][12][13][14][15][16] illustrates the foregoing proposition on the destruction of coherence in the atomic system subjected to instability development. In any case, at the frequency of the exciting pulse, by the time when the second exciting pulse become effective, the phase memory of the first exciting pulse effect had disappeared, otherwise the two-pulse echo would have been observed.…”

“…In experiments [10][11][12][13][14][15][16], the instability developed relative to one of the two possible channels: adjacent transitions 3 H 4 -3 P 0 and 3 P 0 -3 H 6 in the praseodymium ion, which introduces the interference processes into the picture of instability development. As a consequence, it turns out that the above proposition on the destruction of any atomic coherence is not applicable in the given situation.…”

“…The emission of a superradiance pulse results not only in optical coherence destruction in the adjacent transitions 3 H 4 -3 P 0 and 3 P 0 -3 H 6 but also in the coherence transfer to the transition 3 H 4 -3 H 6 remained in the three-level configuration considered. Under the conditions of experiments [10][11][12][13][14][15][16], the selection rules in free atom are not valid for the transitions. However, if the admitted views on optically allowed (electrodipole) and optically forbidden (two-quantum) transitions are used, the picture of phase memory retention and transformation appears as follows.…”