Schedule Mar 15, 2013
Raman Transitions by Chirped Optical Frequency Combs: Prevention of Decoherence
Sveta Malinovskaya (Stevens Inst.)

Svetlana Malinovskaya Department of Physics and Engineering Physics Stevens Institute of Technology, Hoboken, NJ 07030

February 27, 2013

We discuss femtosecond Raman type technique to control molecular vibra- tions with the use of optical frequency combs with and without modulation. The technique makes use of multiple two-photon resonances induced by optical frequencies present in the comb. It provides with a useful tool to study the details of molecular dynamics. We take into account decoherence in the form of spontaneous emission and collisional dephasing in order to ascertain an ac- curate model of the dynamics in the three-level system. We analyze the effects of odd and even chirps of the optical frequency comb in the form of sine and cosine functions on the population transfer. We compare the effects of these chirps to the results attained with the standard optical frequency comb to see if they increase the population transfer to the final deeply bound state in the presence of decoherence. We also analyze the inherent phase relation that takes place owing to collisional dephasing between molecules in each of the states. This ability to control the rovibrational states of a molecule with an optical frequency comb enables us to create a deeply bound ultracold polar molecules from the Feshbach state [1].


[1] S.A. Malinovskaya, S.L. Horton, "Impact of Decoherence on Internal State Cooling using Optical Frequency Combs," J. Opt. Soc. Am. B 30, 482-488 (2013).

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