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- W1528882450 abstract "We present a detailed characterization of energy transfer processes in ${mathrm{Er}}^{3+}$-doped and ${mathrm{Er}}^{3+}{,mathrm{P}mathrm{r}}^{3+}$-codoped ZBLAN bulk glasses. For several ${mathrm{Er}}^{3+}$ (0.25--8.75 mol%) and ${mathrm{Pr}}^{3+}$ (0.25--1.55 mol%) concentrations, we investigate energy transfer upconversion (ETU) and cross relaxation in ${mathrm{Er}}^{3+}$ as well as energy transfer (ET) from ${mathrm{Er}}^{3+}$ to the ${mathrm{Pr}}^{3+}$ codopant. The measured parameters of ETU from the ${mathrm{Er}}^{3+}{}^{4}{I}_{13/2}$ and ${}^{4}{I}_{11/2}$ levels are comparable to those of ${mathrm{LiYF}}_{4}{:mathrm{E}mathrm{r}}^{3+}.$ ETU from ${}^{4}{I}_{13/2},$ in particular, possesses a factor of 3 larger probability than ETU from ${}^{4}{I}_{11/2}.$ The parameters of ET from the ${mathrm{Er}}^{3+}{}^{4}{I}_{13/2}$ and ${}^{4}{I}_{11/2}$ levels to the ${mathrm{Pr}}^{3+}$ codopant are larger than the corresponding ETU parameters. ET effectively quenches the ${}^{4}{I}_{13/2}$ intrinsic lifetime of 9 ms down to 20 ensuremath{mu}s for the highest ${mathrm{Er}}^{3+}$ and ${mathrm{Pr}}^{3+}$ concentrations investigated, and is more efficient than ET from ${}^{4}{I}_{11/2},$ because the corresponding absorption transition in ${mathrm{Pr}}^{3+}$ has a large oscillator strength and back transfer is inhibited by fast multiphonon relaxation from the corresponding ${mathrm{Pr}}^{3+}$ level. In both cases, the ET parameters depend on ${mathrm{Er}}^{3+}$ concentration in a similar way as the ETU parameters but depend only weakly on ${mathrm{Pr}}^{3+}$ concentration. This shows that energy migration within the ${mathrm{Er}}^{3+}{}^{4}{I}_{13/2}$ and ${}^{4}{I}_{11/2}$ levels is fast. The presented results are important for the choice of the appropriate operational regime of the erbium 3-ensuremath{mu}m fiber laser." @default.
- W1528882450 created "2016-06-24" @default.
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- W1528882450 date "2000-07-01" @default.
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- W1528882450 title "Energy transfer processes in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Er</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-doped and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Er</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></…" @default.
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- W1528882450 doi "https://doi.org/10.1103/physrevb.62.856" @default.
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