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Quantum Electronics

Photon echo in medium subjected simultaneously to extremely short and quasiresonant pulses

V Yu Man'kov, A Yu Parkhomenko, С. В. Сазонов

Published Oct 31, 1997• 1 citation
Publisher

Abstract

An investigation is made of a two-pulse photon echo in a two-level medium with strong inhomogeneous broadening, which is subjected simultaneously to extremely short and quasiresonant pulses. Two variants of the sequence of application of the two pulses are considered and it is shown that the kinetics of an echo signal depends largely on the sequence in which the pulses are applied. Suppression of the photon echo is predicted for both variants when a zero-are extremely short pulse is applied to a medium. A qualitative method for determination of the spatial characteristics of such a combined echo is proposed and used. It is shown that, in the investigated cases, the angular distributions of the echo-signal intensity in an extended medium are not as peaked as in the case of a conventional photon echo.

DOI
10.1070/qe1997v027n10abeh001079

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Dec 29, 1999•0 citations
An investigation is made of a two-pulse photon echo in a two-level medium with strong inhomogeneous broadening, which is subjected simultaneously to extremely short and quasiresonant pulses. Two variants of the sequence of application of the two pulses are considered and it is shown that the kinetics of an echo signal depends largely on the sequence in which the pulses are applied. Suppression of the photon echo is predicted for both variants when a zero-are extremely short pulse is applied to a medium. A qualitative method for determination of the spatial characteristics of such a combined echo is proposed and used. It is shown that, in the investigated cases, the angular distributions of the echo-signal intensity in an extended medium are not as peaked as in the case of a conventional photon echo.
The effect of two-pulse photon echoes at the complicated action on a two-level medium with large inhomogeneous broadening of supremely short and quasiresonant pulses is investigated. Two versions of the action sequence of both pulses are considered. It is shown that the temporal properties of the echo signal are depended largely on the action order of indicated pulses. The effect of suppression of the optical echoes in the both cases at the action on a medium of the supremely short zeroth 'area' pulse is predicted. The qualitative procedure of definition of the complicated echoes spatial properties has been proposed and applied. It is shown that in indicated cases the diagrams of the echo signal intensity direction are not so peaked as in the case of common light echo.
A photon echo in a multilevel quantum medium excited by two extremely short pulses with durations of less than one period of oscillation of the light is investigated theoretically. It is shown thatQ echo signals (Q is the number of allowed transitions) can form at each frequency of the allowed transitions, and the number of echo responses for all the allowed transitions equalsQ 2. Of these,Q(Q−1) signals are separated in both time and space. The otherQ echo signals of all the allowed frequencies all arise at the time 2τ 21 (τ 21 is the time interval between application of the first and second pulses to the medium) and are collinear with one another.
Two-frequency correlation between the profiles of signals of the primary and long-lived (stimulated) photon echos in a three-level medium excited by combined sequences of resonance quasimonochromatic (encoding) signals and femtosecond pulses consisting of a few optical oscillations (down to one) is predicted. It is shown that the profiles of echo responses of both frequencies correlate with each other and with the profiles of encoding pulses, copy them, and induce mirror rotations, as well as scaling transformations in time in dependence on the methods of forming exciting sequences.