Pr:RbPb2Cl5: temperature dependent spectra, dynamics and three-for-one excitation
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Updated: Aug 19, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Abstract:
The temperature dependence of the absorption, fluorescence, and fluorescence lifetimes of states relevant to short-wave-infrared and mid-infrared laser operation have been measured in Pr:RbPb2Cl5. The 3600-5500-nm fluorescence grows strongly with temperature, and at room temperature represents the large majority of the observed photon flux. Intra-ionic decay processes cannot explain this dominance, but a combination of two cross-relaxation processes provides good agreement with the data. These results indicate a three-for-one process: the excitation of nearly three ions to the 3H5 manifold of Pr3+ by each one initially excited to 3F3, with the potential for exceptionally high efficiency excitation of mid-infrared laser materials.
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