LiLa9(SiO4)(6)O-2 (LLS) crystals activated with Nd3+ have been grown from a lithium molybdate flux. Their absorption and emission spectra and fluorescence decay profiles have been measured at different temperatures. The spectra are affected by a significant inhomogeneous broadening as a consequence of the partial disorder of the crystal structure. The room temperature absorption spectra have been analyzed using the Judd-Ofelt approach. The Omega(2), Omega(4) and Omega(6) intensity parameters have been evaluated and used to calculate the spontaneous emission probabilities, the branching ratios and the radiative lifetime for the F-4(3/2) emitting level. These values have been compared with the experimental decay time in order to estimate the effect of the non-radiative processes in this material. (
Optical spectroscopy of Nd3+ in LiLa9(SiO4)6O2 crystals
BETTINELLI, Marco Giovanni;SPEGHINI, Adolfo
2009-01-01
Abstract
LiLa9(SiO4)(6)O-2 (LLS) crystals activated with Nd3+ have been grown from a lithium molybdate flux. Their absorption and emission spectra and fluorescence decay profiles have been measured at different temperatures. The spectra are affected by a significant inhomogeneous broadening as a consequence of the partial disorder of the crystal structure. The room temperature absorption spectra have been analyzed using the Judd-Ofelt approach. The Omega(2), Omega(4) and Omega(6) intensity parameters have been evaluated and used to calculate the spontaneous emission probabilities, the branching ratios and the radiative lifetime for the F-4(3/2) emitting level. These values have been compared with the experimental decay time in order to estimate the effect of the non-radiative processes in this material. (
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