Abstract
We demonstrate transient saturation spectroscopy for 167Er3+ ions doped in a silicate glass fiber cooled at 2.5–30 K to measure the population relaxation time t1 of the hyperfine sublevels. The observed t1 value is 3.1 ms at 4 K and we observe anomalous temperature dependence whereby t1 becomes rather longer with heating from 4 to 30 K. 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 167Er3+ ions. We can attribute the anomalous temperature dependence to the suppression of the Raman scattering by thermal hopping of the localized BPM.
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