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 LaF<SUB>3</SUB>:Pr<SUP>3+</SUP> for 4777 angstroms (<SUP>3</SUP>P<SUB>o</SUB> - <SUP>3</SUP>H<SUB>4</SUB>) 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.
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