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Journal of the Optical Society of America B

Increase of the time of information storage by the use of stimulated photon echoes in gases in a magnetic field

Igor V. Yevseyev, Valery M. Yermachenko, Решетов Владимир Александрович

Published Jan 1, 1990• 2 citations
Publisher

Abstract

It is shown that the time of information storage by the use of stimulated photon echoes in gases can be significantly increased in comparison with the radiative lifetime of the upper level by the action of a longitudinal magnetic field in the case of echo formation on the 1/2–1/2 (or 3/2–1/2) transition.
DOI
10.1364/josab.7.000125

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The action of the longitudinal magnetic field on the collision-induced stimulated photon echo formed on the transition with the angular momentum change is studied theoretically. It is shown that this action depends essentially on the sign of the difference in the orientation and alignment relaxation rates of the excited level b. If , then the echo intensity in a weak magnetic field increases with the increase in the magnetic field strength, while in the alternative case it decreases up to zero value. The formulae enabling the determination of the magnitude of the difference from the experimental study of the oscillations of the echo intensity with the increase in the magnetic field strength are obtained.
A retrospective review of both theoretical and experimental works on photon echo in gases in the presence of longitudinal magnetic fields is presented from the viewpoint of new possibilities opened by this research for polarization echo spectroscopy of gases. The main attention is given to the physical scenario of the magnetic field’s effect on the properties of the photon echo. New results on the photon echo and stimulated photon echo in ytterbium vapor at the 1 ↔ 0 transition in the presence of the longitudinal magnetic field whose strength ranges from weak to strong are presented. Possible applications of the magnetic field effects for optical data storage and processing are analyzed.
The possibility for echo signal switching-off and the switching of echo polarization between the ±45° positions is demonstrated for the photon echo (PE) and stimulated photon echo (SPE) generated in Yb vapor at the (6s6p)3 P 1 − (6s 2)1 S 0 transition by two pulses of the resonant linearly polarized radiation at appropriate experimental parameters in the weak magnetic field limit. The experimental data are in qualitative agreement with the theoretical analysis and the calculations made for the 1 ↔ 0 transition. The strong magnetic field limit leads to unpolarized PE and SPE signals generated by linearly polarized radiation pulses. The possibility of the generation of a long-lived echo in ytterbium vapor due to the magnetic field induced mixing of the upper working level with the metastable level is discussed. The results can be employed for the optical data storage and processing.
Abstract Collision-induced stimulated photon echoes formed in a gaseous medium on the transition with the angular momentum change J a = 0 → J b = 1 under the action of ‘strong’ longitudinal magnetic field, when the echo pulse becomes unpolarized, are considered with an account of elastic depolarizing collisions. In the case of narrow spectral line the explicit expressions for the echo polarization density matrix and the degree of polarization are obtained. In the case of broad spectral line the results of the numeric calculations reproduce qualitatively the curve obtained in the experiments with ytterbium vapor.
Shape correlation and magnetic field control of stimulated photon echo (SPE) are investigated as basic properties useful for optical data storage and treatment. The SPE polarization was investigated in ytterbium vapour at the intercombination transition (6s6p) 3P1 → (6s2) 1S0 for the first time in a wide range of longitudinal magnetic field strength. SPE was generated by three resonant laser pulses of identical linear polarization and wave vectors directed symmetrically at small angles to the axis of cylindric vapour cell. SPE polarization is close to linear one in zero magnetic field. As magnetic field increases, the SPE polarization acquires ellipticity with the ellipse axis rotated around magnetic field vector. Components of SPE polarization show oscillations versus magnetic field with higher contrast of the oscillations in the weak field.