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

New channel of photon echo signal relaxation in LaF 3 :Pr 3+ crystal

N. I. Znamenskii, Genady S. Katrich, Yu. V. Malyukin, Eduard A. Manykin, D. V. Marchenko, Evgenii A Petrenko, N. L. Pogrebnyak

Published Sep 26, 1997• 0 citations
Publisher

Abstract

An experimental investigation was made of the optical absorption spectra corresponding to transitions in the Pr3+ ion in crystalline LaF3 matrices. The investigation was carried out in the temperature range 5 divided by 80 K. An anomalous redistribution of the intensity was observed in the absorption spectrum of a Pr3+:LaF3 crystal. This redistribution did not agree with the hypothesis of the Boltzman population of the states in discrete multilevel systems.

DOI
10.1117/12.287699

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Japanese Journal of Applied Physics•Sep 1, 1983•19 citations
An experimental investigation was made of the optical absorption spectra corresponding to transitions in the Pr3+ ion in crystalline LaF3 matrices. The investigation was carried out in the temperature range 5 divided by 80 K. An anomalous redistribution of the intensity was observed in the absorption spectrum of a Pr3+:LaF3 crystal. This redistribution did not agree with the hypothesis of the Boltzman population of the states in discrete multilevel systems.
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.
The photon echo technique was used to investigate the 3P0‐3H6 (5985Å) and the two 3P0‐3H5 (5333.0 Å 5333.5 Å) transitions in Pr3+:LaF3 at 4.6 K. On the 3P0‐3H6 transition, the data displayed modulation and spanned a dynamic range of nine decades in intensity. Echo relaxation rates were anomalously fast in view of previous experiments in this sample. We also report observation of ‘Satellite Echoes’ on the satellite lines of the 3P0‐3H4(4778 Å) transition and present photon echo data obtained on one of the satellite lines. Lasing was observed at 4.6 K and at 77 K during pulse excitation of the 3P0‐3H4 and 3P1(2I6)‐3H4(4633 Å) transitions.
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+.