Two measurements were performed of the fast initial fluorescence decay of the <sup>4</sup><i>F</i><sub>3/2</sub> state of Nd<sup>3+</sup>, 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 Nd<sup>3+</sup> and Er<sup>3+</sup> 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
Oracio Barbosa-García, Ross A. McFarlane, Milton Birnbaum, and Luis Armando Díaz-Torres, "Neodymium-to-erbium nonradiative energy transfer and fast initial fluorescence decay of the 4F3/2 state of neodymium in garnet crystals," J. Opt. Soc. Am. B 14, 2731-2734 (1997)