Coherent interaction of light pulses with a three-level medium

Leonid A Bol'shov, Anatoly P. Napartovich

A. Raczyński, J. Zaremba, S. Zielińska-Kaniasty

Rostislav M. Arkhipov, A. V. Pakhomov, M. V. Arkhipov +1 more

Based on the numerical solution of Maxwell-Bloch equations, we study the dynamics of coherent propagation of unipolar, half-cycle, attosecond light pulse in a three-level resonantly absorbing medium. A comparison with the propagation of such pulse in a two-level medium is performed. It is shown that the pulse, which behaves like a 4π-pulse in a two-level medium, in a three-level medium behaves like a 6π-pulse and splits into three sub-pulses propagating at different velocities in the medium. The investigated phenomenon allows for a more detailed understanding of the still insufficiently studied dynamics of coherent propagation of half-cycle pulses in a resonant medium.

G. G. Grigoryan, V. O. Chaltykyan, E. A. Gazazyan +2 more

We consider adiabatic interaction of five-level atomic systems and their media with four short laser pulses under the condition of all two-photon detunings being zero. We derive analytical expressions for eigenvalues of the system's Hamiltonian and determine conditions of adiabaticity for both the atom and the medium. We analyze, in detail, the system's behavior when the eigenvalue with nonvanishing energy is realized. As distinct from the usual dark state of a five-level system (corresponding to zero eigenvalue), which is a superposition of three states, in our case the superposition of four states does work. We demonstrate that this seemingly unfavorable case nevertheless completely imitates a three-level system not only for a single atom but also in the medium, since the propagation equations are also split into those for three- and two-level media separately. We show that, under certain conditions, all the coherent effects observed in three-level media, such as population transfer, light slowing, light storage, and so on, may efficiently be realized in five-level media. This has an important advantage that the light storage can be performed twice in the same medium; i.e., the second pulse can be stored without retrieving the first one, and then the two pulses can be retrieved in any desired sequence.

Leonid A Bol'shov, Vladimir V. Likhanskii, M. I. Persiantsev

A. A. Zobolotskii