Abstract
We demonstrate transient saturation spectroscopy for ions doped in a silicate glass fiber cooled at to measure the population relaxation time of the hyperfine sublevels. The observed value is at and we observe anomalous temperature dependence whereby becomes rather longer with heating from 4 to . 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 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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