Laser-field-induced quantum beats in correlations in cascade emission

Nadeem A. Ansari, Khalid Zaheer

Anil K. Patnaik, G. S. Agarwal

A cascade system involving two closely lying intermediate states can exhibit quantum beats in two-photon correlations provided that the dipole matrix elements satisfy certain conditions which, however, are rarely satisfied by atomic systems. However, if two intermediate states are produced by using ac Stark splitting, then quantum beats will always occur. Detailed analysis of such beats and their physical interpretation is given.

Alain Aspect, Jean Dalibard, Philippe Grangier +1 more

Lampros A. A. Nikolopoulos

G. S. Agarwal, János A. Bergou, Claus Benkert +1 more

An intense single-mode correlated-spontaneous-emission laser or maser can be realized by driving the active atoms coherently with an injected external field. The scheme involves single-photon transitions unlike the two-photon or quantum-beat correlated-emission lasers that utilize correlations between successive photon-cascade emissions or between simultaneous emissions into modes of the field. Quenching of both the amplitude and phase noise and, in certain cases, squeezing of the amplitude fluctuations are found.

P. Tzallas