Absorption and emission involving exchange-coupled nearest-neighbor ${\mathrm{Cr}}^{3+}$ and ${\mathrm{Eu}}^{3+}$ ions have been observed in ${\mathrm{Cr}}^{3+}$ -doped EuAl ${\mathrm{O}}_{3}$ at the sum of the chromium $^{2}E_{g}$ and europium $^{7}F_{1}$ energies. Weak absorption at the difference energy has also been observed. The latter is the inverse of the previously studied europium terminated chromium emission. The intensities of the ${\mathrm{Eu}}^{3+}$ sideband transitions vary with the strength of the exchange-induced electric dipole moment.Absorption and emission involving exchange-coupled nearest-neighbor ${\mathrm{Cr}}^{3+}$ and ${\mathrm{Eu}}^{3+}$ ions have been observed in ${\mathrm{Cr}}^{3+}$-doped EuAl${\mathrm{O}}_{3}$ at the sum of the chromium $^{2}E_{g}$ and europium $^{7}F_{1}$ energies. Weak absorption at the difference energy has also been observed. The latter is the inverse of the previously studied europium terminated chromium emission. The intensities of the ${\mathrm{Eu}}^{3+}$ sideband transitions vary with the strength of the exchange-induced electric dipole moment.

Physical review. B, Solid stateSep 1, 197313 citations

Stimulated Optical Emission from Exchange-Coupled Ions of Cr+++ in Al2 O3

Irwin Wieder, Lynn R. Sarles

Physical Review LettersFeb 1, 196167 citations

Absorption and emission involving exchange-coupled nearest-neighbor

{\mathrm{Cr}}^{3+}

and

{\mathrm{Eu}}^{3+}

ions have been observed in

{\mathrm{Cr}}^{3+}

-doped EuAl

{\mathrm{O}}_{3}

at the sum of the chromium

^{2}E_{g}

and europium

^{7}F_{1}

energies. Weak absorption at the difference energy has also been observed. The latter is the inverse of the previously studied europium terminated chromium emission. The intensities of the

{\mathrm{Eu}}^{3+}

sideband transitions vary with the strength of the exchange-induced electric dipole moment.