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Low Temperature Physics

New channels of photon echo relaxation in Y2SiO5:Pr3+ and LaF3:Pr3+ crystals

Yu. V. Malyukin

Published Sep 1, 1997• 1 citation
Publisher

Abstract

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.

DOI
10.1063/1.593465

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Apr 20, 2004•0 citations
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.
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+.
In a Y2SiO5:Pr3+ crystal characterized by two non-equivalent Pr3+ optical centers, the interaction mechanisms between Pr3+ ions as well as between Pr3+ ions and a crystal lattice have been studied. It has been shown that along with the electron-phonon interaction, the interaction between Pr3+ ions and two-level systems made an additional contribution to the homogeneous linewidth of the 3H4↔3P0 optical transition. Two different mechanisms of the Pr3+ interionic coupling have been found. The first mechanism is associated with a dipole-dipole interaction between non-equivalent Pr3+ optical centers, while the other one is governed by a cooperative cross relaxation of the excitation energy among the same type Pr3+ optical centers.