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Abstract
We consider a three-level atomic system interacting with two coherent fields in the ladder configuration. Namely, the pumping field couples the ground and first excited state while the driving field interacts with the two excited states. The intensity spectrum of resonant optical fluorescence at the two-photon transition is studied. It is shown that coherent driving in this scheme allows for efficient control of fluorescence distribution between the one-photon (elastic with respect to pumping field) and two-photon (anti-Stoke Raman with respect to the driving field) channels.
Acknowledgements
We are deeply grateful to Yuri Rostovtsev, Edgar Sadykov, Farit Vagizov and Chris O'Brien for stimulating discussions. This research has been supported by NSF and CRDF. Shaoyan Gao appreciates also a support of this work by the National Science Foundation of China under Grant Nos. 10804092 and 10674106.