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Journal of Experimental and Theoretical Physics Letters

Amplification of the Photon Echo by Magnetic Pulses in the Er3+-Doped LuLiF4 and YLiF4 Samples

Шегеда Анатолий Михайлович, M. S. Eremin, Кораблева Стелла Леонидовна

Published Dec 1, 2025• 0 citations
Publisher

Abstract

The effect of nanosecond magnetic pulses on a photon echo signal in the Er3+-doped YLiF4 and LuLiF4 samples has been considered. A strong dependence of the photon echo intensity on the parameters of the magnetic pulse and the direction of variation of the external magnetic field H has been found. The application of magnetic pulses can increase the echo intensity by a factor of 5–6. The irreversibility (nonreciprocity) effect is explained by the occurrence of the spatial dispersion of the permittivity.

DOI
10.1134/s0021364025609753

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The effect of nanosecond magnetic pulses on a photon echo signal in the Er3+-doped YLiF4 and LuLiF4 samples has been considered. A strong dependence of the photon echo intensity on the parameters of the magnetic pulse and the direction of variation of the external magnetic field H has been found. The application of magnetic pulses can increase the echo intensity by a factor of 5–6. The irreversibility (nonreciprocity) effect is explained by the occurrence of the spatial dispersion of the permittivity.
The memory effect in the form of hysteresis has been detected in the measured dependence of the intensity of the photon echo in YLiF4 and LuLiF4 samples with Er3+ impurity ions on the orientation, strength, and variation direction of the magnetic field. The prehistory of the location of a sample in the magnetic field with a certain direction and strength is written and stored for no less than 6 h at a temperature of 2 K. The effect crucially depends on the orientation of the optical axis of the sample with respect to the external magnetic field.
The memory effect in the form of hysteresis has been detected in the measured dependence of the intensity of the photon echo in YLiF4 and LuLiF4 samples with Er3+ impurity ions on the orientation, strength, and variation direction of the magnetic field. The prehistory of the location of a sample in the magnetic field with a certain direction and strength is written and stored for no less than 6 h at a temperature of 2 K. The effect crucially depends on the orientation of the optical axis of the sample with respect to the external magnetic field.
It is reported about the first observation and studying of the photon echo in LuLiF4:Er3+. The energy transition is 4I15/2→4F9/2 (λ=6536 Å). The density of ErF3 is 0.025 wt%. The operation temperature is 1.9 K. Measurements were spent at low (up to 1200 Oe) and even zero external magnetic fields. It was studied a behavior of the photon echo intensity versus the magnetic field magnitude and direction about the crystal axis C and versus the laser pulse separation t 12. It was observed an exponential growth and then, after some plateau, an exponential decreasing of the photon echo intensity as a function of magnetic field with increasing of the magnetic field from zero value. The parameters describing the exponential growth and decreasing are not depended on direction of magnetic field. Value of a magnetic field at which the echo intensity accepts the maximum, and quantity of this maximum decrease with increased the pulse separation t 12 and the angle θ between the magnetic field and crystal axis. The echo intensity exponentially decreases with increased θ. The parameter describing the exponential decreasing is not depended on the magnitude of the field. The echo intensity as a function of pulse separation shows exponential decay. The phase relaxation time is depended on the magnitude and direction of the magnetic field. T 2 is equal to 202±16 ns at zero magnetic field. Phenomenological formula is suggested, which qualitatively presents the mentioned dependencies. Polarization properties of the backward photon echo in this crystal are studied also.