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On the peculiarities in the behaviour of a three-level quantum system in presence of a strong resonant light field

Konstantin N. Drabovich, Ludmila S. Kancheva

Published Jan 1, 1975• 0 citations
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Physica Scripta•Feb 8, 2007•40 citations
Three-photon excitation of a dipole-allowed atomic transition in rare gases is cancelled at an elevated gas pressure due to the well-known destructive interference of the three- and one-photon transition amplitudes in resonant atomic excitation. This cancellation effect is independent of laser light intensity, but is strongly modified in the presence of counterpropagating light. It has been shown that under three-photon resonant pumping at 1010 W cm−2 the multiphoton ionization through the cancelled 6s[3/2] J = 1 resonance of xenon can be initiated by counterpropagating light with an intensity as low as 103 W cm−2, which is by many orders of magnitude less than normally required for the onset of multiphoton excitation and ionization processes in rare gases. Some peculiarities of such triggered multiphoton ionization are discussed.
We have studied nonlinear quantum optical effects in a doubly driven four-level atomic system in a homogeneously broadened regime. On application of two strong fields the system can be made to display double electromagnetically induced transparency (EIT) because of constructive quantum interference giving rise to nonlinear absorption at three-photon resonance condition. This fact may be used to obtain other phenomena like the effect of photon switching in a pulsed regime and large cross phase modulation (XPM) effect. We also show that the behaviour of spatial modulation of transparency of the weak probe beam in a three-level system interacted with a strong standing wave pump field can be dramatically changed in our four-level ladder type system. Here, strong coupling field acting on the uppermost transition is represented by a standing wave whereas strong pump and weak probe fields acting successively on the lower transitions are represented by travelling waves. The effect of double EIT on nonlinear light generation based on the four-wave-mixing (FWM) technique is also investigated. We have examined that the four wave mixing efficiency can be effectively controlled by varying the strength of the pump field.