Defect-induced one-phonon absorption of far-infrared radiation is utilized to generate a nonequilibrium phonon population in ${\mathrm{PrF}}_3$. We observe that the nonequilibrium phonon population stimulates energy transfer between the ${\mathit{A}}_3$ and the stoichiometric sites of the ${\mathrm{Pr}}^{3+}$ ion. We investigate both the spectral and temporal dynamics associated with this process and compare the data to a simple rate-equation model. An upper limit of (1.9±0.2)×${10}^6$ ${\mathrm{s}}^{\mathrm{-}1}$ for the ${\mathit{A}}_3$ main-site transfer rate is determined.

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