Excitation effects in non-radiative multiphonon decays of rare earth doped laser materials. Auzel, F. & Pellé, F. Optical Materials, 8(1-2):15--20, July, 1997. ![Excitation effects in non-radiative multiphonon decays of rare earth doped laser materials [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex The non-radiative decay process of rare earth ions in solids, which are known to constitute a whole class of laser materials, has been considered up to now to be independent of excitation intensity. We shall show here that the multiphonon non-radiative decay probabilities of rare earth ions in glasses are reduced at high excitation state densities for the larger energy gaps. The classical exponential energy gap law is shown to [`]rotate' at higher excitation around the 3.2-phonon point. The observed effect is described in term of a spatial saturation of the accepting mode term with effective diffusion lengths ranging between 54 and 20 Å for excited state density from 1017 to 1019 cm-3. This effect which is predicted to be general for multiphonon processes at large gives hints for the obtention of laser effects from otherwise non-radiative transitions provided the excitation density is sufficient to allow the coupling between ions through a common phonon diffusion volume.
@article{auzel_excitation_1997,
title = {Excitation effects in non-radiative multiphonon decays of rare earth doped laser materials},
volume = {8},
issn = {0925-3467},
url = {http://www.sciencedirect.com/science/article/B6TXP-3W83TVP-3/2/148a0d97de129610c192d0b2580b225f},
doi = {10.1016/S0925-3467(97)00031-1},
abstract = {The non-radiative decay process of rare earth ions in solids, which are known to constitute a whole class of laser materials, has been considered up to now to be independent of excitation intensity. We shall show here that the multiphonon non-radiative decay probabilities of rare earth ions in glasses are reduced at high excitation state densities for the larger energy gaps. The classical exponential energy gap law is shown to [`]rotate' at higher excitation around the 3.2-phonon point. The observed effect is described in term of a spatial saturation of the accepting mode term with effective diffusion lengths ranging between 54 and 20 Å for excited state density from 1017 to 1019 cm-3. This effect which is predicted to be general for multiphonon processes at large gives hints for the obtention of laser effects from otherwise non-radiative transitions provided the excitation density is sufficient to allow the coupling between ions through a common phonon diffusion volume.},
number = {1-2},
urldate = {2009-11-07TZ},
journal = {Optical Materials},
author = {Auzel, F. and Pellé, F.},
month = jul,
year = {1997},
pages = {15--20}
}
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