Abstract

Two measurements were performed of the fast initial fluorescence decay of the ${ }^4{F}_{3/2}$ state of ${\mathrm{Nd}}^{3+},$ following pulsed excitation of the ion in two garnet crystals, (i) Nd(1%), Er(15%), Cr(1%):YAG and (ii) Nd(1.5%), Er(20%):YSGG. The nature of the interaction between ${\mathrm{Nd}}^{3+}$ and ${\mathrm{Er}}^{3+}$ ions is analyzed with a Monte Carlo model for the nonradiative energy transfer from Nd to Er. Our measurements and the Monte Carlo analysis corroborate the presence of a submicrosecond fluorescence decay transient and the reported nature of the interaction that drives the energy transfer, i.e., a mixture of electrostatic interactions (dipole–dipole, dipole–quadrupole, and quadrupole–quadrupole) and an exchange interaction.

© 1997 Optical Society of America

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