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Japanese Journal of Applied Physics

Phonon-Induced Transverse Relaxation in LaF3:Pr3+ Measured by Photon Echoes

T. Kohmoto, Hiroki Nakatsuka, Masahiro Matsuoka

Published Sep 1, 1983• 19 citations
Publisher

Abstract

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+.

DOI
10.1143/jjap.22.l571

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Sep 26, 1997•0 citations
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+.
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.
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.
We have observed spatial-image storage and phase conjugation, using a backward-stimulated echo in a solid sample. The image storage and the delayed phase conjugation were observed to last for at least 15 sec, which is 3 × 105 times longer than the radiative lifetime of the excited state. The backward-stimulated echo produced on the 3H4–3P0 transition of Pr3+:LaF3 is found to be a phase-conjugated spatial reproduction of the first excitation pulse. The image storage time depends strongly on the sample temperature.