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Journal of Optical Technology

Frequency–time correlation of the inhomogeneous broadening of a resonance line and data-locking efficiency in various setups for exciting a stimulated photon echo

E. N. Ahmedshina, Guzel I. Garnaeva, Leonid A. Nefediev, А. Р. Сахбиева

Published Sep 30, 2014• 0 citations
Publisher

Abstract

This paper discusses the data-locking efficiency when data is recorded by means of stimulated-photon echo and the dependence of the frequency–time correlation coefficient of inhomogeneous broadening in various regions of the excitation of an inhomogeneously broadened line. It is shown that the rate of change of the correlation coefficient depends on the region of excitation of the inhomogeneously broadened line, as well as on the gradients of the external spatially inhomogeneous electromagnetic fields.

DOI
10.1364/jot.81.000560

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This paper discusses the data-locking efficiency when data is recorded by means of stimulated-photon echo and the dependence of the frequency–time correlation coefficient of inhomogeneous broadening in various regions of the excitation of an inhomogeneously broadened line. It is shown that the rate of change of the correlation coefficient depends on the region of excitation of the inhomogeneously broadened line, as well as on the gradients of the external spatially inhomogeneous electromagnetic fields.
The formation of responses of stimulated photon echo and the efficiency of data locking under the action of a spatially inhomogeneous electric field on a resonance medium are analyzed. It is shown that the action of a spatially inhomogeneous electric field on a resonance medium between the first and second excitation laser pulses leads to the reversible destruction of the phase memory of the medium, which manifests itself in a change in the time-frequency correlation of inhomogeneous broadening. The possibility of controlling the efficiency of data locking by varying the gradient of an external nonuniform electric field is considered.
The frequency–time correlation of inhomogeneous broadening on different transitions in a threelevel resonant medium in the presence of external spatially nonuniform electric fields is considered. It is shown that, under a certain relationship between the magnitudes of gradients of external nonuniform electric fields acting at different moments of time, it is possible to control the magnitude of the frequency–time correlation on different frequency transitions. An increase in the frequency–time correlation coefficient with certain strengths of external spatially nonuniform electric fields leads to the recovery of the phase memory of the system and an increase in the stimulated photon echo intensity.
This paper discusses the correlation of inhomogeneous broadening at various frequency transitions in three-level systems and how it affects the intensity of the stimulated-photon-echo response. It is shown that the correlation coefficient of inhomogeneous broadening at two different energy transitions and the response intensity of the stimulated photon echo depends on the random interaction parameter m of an optical electron with the local field, which in turn depends on the unequal-spacing parameter of the spectrum of the system.
The effect of locking of a long-lived photon echo is investigated in the case where nonresonant laser radiation (a standing or traveling wave with an artificially created spatial inhomogeneity) serves as an inhomogeneous external perturbation, which results in random shifts or splitting of the initial monochromatic components of the inhomogeneously broadened line. The use of the mutual spatial orientation of the gradients of electric fields as an associative key of access to recorded information allows one to produce a large number of independent channels of data recording. It is demonstrated that the proposed scheme for recording and associative sampling of information has the advantage that, in each channel, information is recorded simultaneously at all optical centers (the whole inhomogeneously broadened resonance line), which does not decrease the intensity of the response from each channel. Moreover, the echo holographic information coded in the wavefronts of the exciting pulses can also be recorded in each channel, which does not affect the independence of individual channels of data recording.