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

Optical phase shift by noncoherent heat phonons

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

Published Sep 26, 1997• 0 citations
Publisher

Abstract

The effect of heat ballistic phonon pulses of the nanosecond duration on the inverted photon echoes in ruby with the concentration of Cr3+ ions of 0.2 wt.% and 0.03 wt.% and in LaF3:Pr3+ for 4777 A (3P0 - 3H4) transition with the concentration of Pr3+ ions of 1 wt.% at temperature 2 K is studied. The basic result of given work: observation of coherent interaction of noncoherent heat phonons with impurity (interaction without coherence loss).

DOI
10.1117/12.287659

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Low Temperature Physics•Sep 1, 1997•1 citation
The effect of heat ballistic phonon pulses of the nanosecond duration on the inverted photon echoes in ruby with the concentration of Cr3+ ions of 0.2 wt.% and 0.03 wt.% and in LaF3:Pr3+ for 4777 A (3P0 - 3H4) transition with the concentration of Pr3+ ions of 1 wt.% at temperature 2 K is studied. The basic result of given work: observation of coherent interaction of noncoherent heat phonons with impurity (interaction without coherence loss).
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.
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 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.
Experimental results on the investigation of low-temperature optical absorption spectra and temperature dependence of the photon echo (PE) amplitude signal in Y2SiO5:Pr3+ and LaF3:Pr3+ crystals at the transition H43(0)−3P0 of the Pr3+ ion are presented. It is shown that additional relaxation channels exist for PE in addition to the known phonon mechanisms. This is associated in a LaF3:Pr3+ crystal with the temperature variation of dipole moment at the Pr3+ ion transition. In a Y2SiO5:Pr3+ crystal, this is due to the thermally activated transitions for the Pr3+ ion between nonequivalent positions in the crystal lattice.