The ${\mathrm{Nd}}^{3+}\to {\mathrm{Yb}}^{3+}$ energy transfer spectral characteristics in $(\mathrm{Nd},\mathrm{Yb}):{\mathrm{Y}}_2{\mathrm{O}}_3$ ceramics and the relevant spectral and emission decay data on single-doped (especially temperature effects) and codoped samples are presented. The transfer efficiencies depend strongly on ${\mathrm{Yb}}^{3+}$ content, attaining $\sim 98\mathrm{\%}$ for $\mathrm{Nd}1\mathrm{at.}\mathrm{\%}–\mathrm{Yb}5\mathrm{at.}\mathrm{\%}$ at $300\mathrm{K}$ . The resonant ${\mathrm{Nd}}^{3+}\to {\mathrm{Yb}}^{3+}$ energy transfer $({}^4\mathrm{F}_{3∕2}\left(\mathrm{Nd}\right),{}^2\mathrm{F}_{7∕2}\left(\mathrm{Yb}\right))\to ({}^4\mathrm{I}_{9∕2}\left(\mathrm{Nd}\right),{}^2\mathrm{F}_{5∕2}\left(\mathrm{Yb}\right))$ , involving ${\mathrm{Nd}}^{3+}$ in ${\mathrm{C}}_2$ sites and ${\mathrm{Yb}}^{3+}$ in ${\mathrm{C}}_2$ and ${\mathrm{C}}_{3\mathrm{i}}$ sites, is dominated by a dipole–dipole interaction with a microparameter $C_{\mathrm{DA},\mathrm{Nd}–\mathrm{Yb}}\approx 1\times {10}^{-38}{\mathrm{cm}}^6{\mathrm{s}}^{-1}$ at $300\mathrm{K}$ . The possibility of using this system for Nd-sensitized ${\mathrm{Yb}}^{3+}$ laser emission from room-to-cryogenic temperatures is discussed.

© 2010 Optical Society of America

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