Stimulated Radiation from Atoms During Interaction of Cascade Transitions

N. A. Enaki, Tudor Roşca

The two-photon processes between the two- and single-photon transitions of three-level inverted radiators stimulated by a thermal field are revised. This approach opens new possibilities in the manipulation of the decay process and the generation of entangled photon pairs. The influence of the thermal bath on the correlation between the cascade three-level subsystems and the two-quantum transitions of the dipole-forbidden radiators is studied. This effect corresponds to the situation where the total energy of emitted photons by three-level dipole-active radiators in the cascade configuration enters into two-photon resonance with dipole-forbidden transitions of the second atom.

Helen K. Holt

Helen K. Holt

Song-Gen Sun, Daning Shi

In a cascade three-level atomic system, a parametric study of sub-Poisson or super-Poisson distribution of a stimulated field was performed. By numerical calculation and figures, we investigated the time evolution of the sub-Poisson distribution of a radiation field. We found that different atomic initial states and different ratios of photon numbers of two radiation fields as well as different ratios of two transitions have a remarkable influence on this distribution. It is interesting to note that under certain conditions, in this cascade structure, there is a high degree of super-Poisson distribution that has not been reported in other structures. We try to explore this anomaly in detail.

A. D. Gazazyan

Victor P. Kochanov

The theory of stimulated Raman and hyper-Raman scattering involving resonance transitions to the ground states of atoms is presented, where the atoms are modeled by the three-level cascade quantum system. The possibility of efficient inversionless generation of radiation is shown for all three transitions participating in the stimulated Raman scattering and for the two electric-dipole allowed transitions in the hyper-Raman scattering. The existence conditions for such generation are determined depending on intensities of the three waves participating in closed-loop wave mixing, their total phase, and pump frequency detuning from the frequency of the dipole-forbidden transition. A new method of remote sensing of atomic components of the atmosphere based on inversionless generation is proposed, which may have significantly higher detection sensitivity as compared to traditional fluorescence technique.