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

Interaction of optically coherent excited impurity system with heat-pulse ballistic phonons

V. N. Lisin, Шегеда Анатолий Михайлович, B. M. Khabibullin, В. А. Зуйков, Самарцев Виталий Владимирович

Published Mar 15, 1999• 0 citations
Publisher

Abstract

It is studied the effect of the ballistic phonons of heat pulses of the nanosecond duration on the inverted photon echoes in ruby and in LaF3:Pr3+ for 4777 angstroms (3Po - 3H4) transition at temperature 2 K. The phonon pulses are generated by fast joule heating of thin Cu-film. The photon echo is used as the phonon detector. The decrease in the echo intensity is observed experimentally when ballistic longitudinal phonon pulse was propagated in optically excited volume during photon echo formation. The echo intensity is restored up to initial values by the second ballistic longitudinal phonon pulse in our experiment. In this case the each impurity ion is interacted with two alike phonon pulses after the recording and, accordingly, reading laser pulses. This indicates, that the main effect of the heat ballistic phonon on impurity consists in a shift of the impurity optical frequencies, instead of in relaxation transitions. The energy level shifts are not depended on duration of a pulse in experiment. The effect of the two pulses of the heat ballistic phonons is not additive.

DOI
10.1117/12.342338

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It is studied the effect of the ballistic phonons of heat pulses of the nanosecond duration on the inverted photon echoes in ruby and in LaF3:Pr3+ for 4777 angstroms (3Po - 3H4) transition at temperature 2 K. The phonon pulses are generated by fast joule heating of thin Cu-film. The photon echo is used as the phonon detector. The decrease in the echo intensity is observed experimentally when ballistic longitudinal phonon pulse was propagated in optically excited volume during photon echo formation. The echo intensity is restored up to initial values by the second ballistic longitudinal phonon pulse in our experiment. In this case the each impurity ion is interacted with two alike phonon pulses after the recording and, accordingly, reading laser pulses. This indicates, that the main effect of the heat ballistic phonon on impurity consists in a shift of the impurity optical frequencies, instead of in relaxation transitions. The energy level shifts are not depended on duration of a pulse in experiment. The effect of the two pulses of the heat ballistic phonons is not additive.
A strong decreasing of the intensity of the inverse 2-pulse, 3-pulse and long lived 3-pulse photon echo was observed when a current pulse passed through the strip evaporated onto the surface of the sample (current pulse was applied before or after the laser pulses). The strip is heated by the current pulse and there is the voltage difference at the ends of the strip. The voltage difference creates instantly the nonuniform electric field in the region of optical excitation so the echo intensity is decreased by the short-lived nonuniform line width rise. The line width rise is differentiated for the distinct type ion sites in the LaF3 unit cell. The strip current-heating gives rise to a phonon pulse. When phonon pulse reaches the optically excited volume it causes the shift of energy levels of Pr3+ ions, effecting a phase accumulation and the echo intensity change as a consequence.
Temperature dependences of backward photon echo intensity have been measured from 5°K to 13°K on the 3P0–3H4 (4778 Å) and 1D2–3H4 (5925 Å) transitions of LaF3:Pr3+. Over six orders of magnitude (on the 3P0–3H4 transition) and three orders of magnitude (on the 1D2–3H4 transition) of the photon echo intensity, the experimental results are explained by the one-phonon process (the direct process) taking into account the energy differences between the echo levels and their adjacent levels. Preliminary measurements have also been made on the 4G7/2–4I9/2 (5221 Å) and 4G5/2–4I9/2 (5775 Å) transitions of LaF3:Nd3+.
A theoretical study was made of the conditions for observing the photon echo effect in a germanium crystal doped with shallow donors. A numerical calculation of the medium polarization excited by a sequence of two optical pulses at a frequency close to the impurity transition frequency has been made. The effect of excitation pulse parameters, such as the pulse duration, the inhomogeneous broadening of impurity transitions and the relaxation rate of population and coherence in the system on the echo is considered. The key aspect in the experimental implementation of the effect is the control of the crystal temperature under photoexcitation, since the rate of coherence relaxation in the system strongly depends on the temperature of the crystal lattice.
A theoretical study was made of the conditions for observing the photon echo effect in a germanium crystal doped with shallow donors. A numerical calculation of the medium polarization excited by a sequence of two optical pulses at a frequency close to the impurity transition frequency has been made. The effect of excitation pulse parameters, such as the pulse duration, the inhomogeneous broadening of impurity transitions and the relaxation rate of population and coherence in the system on the echo is considered. The key aspect in the experimental implementation of the effect is the control of the crystal temperature under photoexcitation, since the rate of coherence relaxation in the system strongly depends on the temperature of the crystal lattice. Keywords: germanium, shallow donors, coherent effects, photon echo.