Abstract

We demonstrate transient saturation spectroscopy for Er3+167 ions doped in a silicate glass fiber cooled at 2.530K to measure the population relaxation time t1 of the hyperfine sublevels. The observed t1 value is 3.1ms at 4K and we observe anomalous temperature dependence whereby t1 becomes rather longer with heating from 4 to 30K. We can regard the population relaxation as a result of the Raman scattering of the Boson peak mode (BPM) peculiar to a silicate glass by the 4f-electrons of the Er3+167 ions. We can attribute the anomalous temperature dependence to the suppression of the Raman scattering by thermal hopping of the localized BPM.

© 2011 Optical Society of America

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