Study of Coherent Population Trapping State with a Four-Level System

M. L. Ladrón de Guevara

Fuli Li, Shi-Yao Zhu

Laurentius Windholz

Coherent population trapping (CPT) is treated in multi–level systems, excited by two– or four–frequency laser light. The dynamics of filling non–absorbing (dark) states is investigated. In cases where all transitions involved are excited (closed systems), the effect becomes dependent on the relative phase of the light waves. Further electromagnetically induced transparency (EIT) is described in three– and four–level systems and used for effective side band generation.

Yandong Peng, Xiangming Hu, Gong Cheng

We present the phase control of photon correlations in a driven four-level system in the double lambda configuration. The strong correlation and the anticorrelation are obtained when the collective phase of four applied laser fields is varied. The coherent control is based on the phase-dependent coherent population trapping (CPT). The strong correlation occurs when the system operates near CPT, while the anticorrelation occurs when the system is far away from CPT.

E. Arimondo

Wolfgang Maichen, Rainer Gaggl, Eugeny Korsunsky +1 more