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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Efficient selective excitation in optically thick extensive media by adiabatic population transfer

Vasily G. Arkhipkin, Д. В. Манушкин, V. P. Timofeev, Ivan V. Timofeev

Published Jan 11, 2000• 0 citations
Publisher

Abstract

In this work, the feature of spatio-temporal evolution of tow partially overlapped short pulses of counterintuitive sequence in a medium of three-level absorbing atoms in conditions of adiabatic transfer of population are investigated. The analytic solution is constructed. It is shown, that selective excitation of two-photon resonant state with a near-unity probability is conserved on the length of medium, which is considerably greater than the absorption length of a weak probe pulse in the absence of a coupling pulse at the adjacent transition.

DOI
10.1117/12.375171

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In this work, the feature of spatio-temporal evolution of tow partially overlapped short pulses of counterintuitive sequence in a medium of three-level absorbing atoms in conditions of adiabatic transfer of population are investigated. The analytic solution is constructed. It is shown, that selective excitation of two-photon resonant state with a near-unity probability is conserved on the length of medium, which is considerably greater than the absorption length of a weak probe pulse in the absence of a coupling pulse at the adjacent transition.
Features of the adiabatic population transfer are studied with the spatial evolution of interacting pulses propagating in an optically dense medium of three-level Λ-atoms taken into account. A self-consistent analytical solution describing the spatial-temporal dynamics of interacting short pulses under the conditions of adiabatic population transfer is constructed in the adiabatic approximation with consideration for the first nonadiabatic correction. Practically complete inversion on a forbidden transition determined by coherent (adiabatic) population transfer is shown to take place over a length of the medium, which may exceed the absorption length of a weak probing pulse in the absence of control radiation on the adjacent transition by several orders of magnitude.
The features of spatial propagation of two partially overlapping short resonant pulses (counterintuitive pulse sequencing) in an absorbing medium of three-level atoms under conditions of adiabatic population transfer are investigated. We find that pulses can propagate with practically constant amplitudes in a medium with length much higher than the absorption length. It is shown that adiabatic population transfer creates full population inversion on a dipole-forbidden (Raman) transition over the way of pulses' propagation. We suggest use of this technique for conversion of picosecond laser pulses into tunable coherent anti-Stokes radiation.
Spatio-temporal dynamics of two short laser pulses propagating in an absorbing medium, which consists of one- and two-photon resonant (Lambda) -atoms, is investigated in the adiabatic approximation. We give an analytical solution and compare it with numerical simulations. It is shown that pulses may propagate in a medium, whose thickness is considerably greater than the length of the linear absorption of a single weak probe wave. Finally, full transfer of the probe pulse energy into the coupling pulse takes place. A vector model of the adiabatic interaction of two pulses with three-level atom is proposed.
The features of spatial and temporal evolution of two short laser pulses propagating in three-level medium under conditions of coherent population trapping and adiabatic population transfer is investigated in adiabatic approximation. It is shown that in both cases pulses can penetrate into a medium at a distance considerably exceeding the length of linear absorption of a single weak probe pulse in absence of a coupling pulse at adjacent transition. The difference of spatial and temporal evolution of level populations in processes of coherent population trapping and adiabatic population transfer is demonstrated. Also we show that the concept of dressed-field pulses is consequence of Manley-Raw relation.
The spatial and temporal dynamics of two short pulses propagating in an optically dense medium of resonant three-level Λ-atoms is investigated numerically and analytically. The maximum coherence for the Raman transition due to coherent population trapping. It is shown that, at the initial stage of propagation, the waveforms of such pulses only slightly change along the length of the medium, which may considerably exceed the length of linear absorption for a single weak pulse. As the length of the absorbing medium increases, the energy of the probe (first) pulse is completely transferred into the second (control) pulse.