2-PHOTON EMISSION-SPECTRUM OF A 2-LEVEL ATOM IN AN IDEAL CAVITY

The time-dependent two-photon emission spectra of a two-level atom int eracting with a single-mode radiation field in an ideal cavity have be en studied. The expressions of the system operators as a function of t ime have been derived based on the two-photon Jaynes-Cummings model an d Heisenberg equation. As a result, the theoretical curves of the time -dependent two-photon emission spectra have been given. The features o f two-photon emission spectra depend not only on the photon statistica l distribution of the initial field, such as the thermal field, the sq ueezed vacuum field, and the coherent field, but also on the passband width of the filter detector GAMMA. The two-photon emission spectra ex hibit multi-peaked structures when GAMMA < lambda (two-photon coupling constant).