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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Tm +3 decay in chromium-thulium-holmium-doped yttrium aluminum garnet at liquid helium temperatures

Stanley R. Rotman, Avishay Eyal, Yehoshua Y. Kalisky, A. Brenier, Christian Pedrini, G. Boulon, Francis X. Hartmann

Published Aug 13, 1993• 0 citations
Publisher

Abstract

The standard expression for the excited state acceptor concentration in codoped solid-state materials is modified to include the possibility of non-radiative acceptor de-excitation. The chromium and thulium time-dependent emission in yttrium aluminum garnet (YAG) is then studied; evidence is given for the identification of the tendency for localized correlated chromium-thulium pairs in the crystalline material.

DOI
10.1117/12.151083

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The standard expression for the excited state acceptor concentration in codoped solid-state materials is modified to include the possibility of non-radiative acceptor de-excitation. The chromium and thulium time-dependent emission in yttrium aluminum garnet (YAG) is then studied; evidence is given for the identification of the tendency for localized correlated chromium-thulium pairs in the crystalline material.
The spectra of luminescence and magnetic circular polarization of luminescence in the 1 D 2 → 3 F 4 emission band in thulium:yttrium-aluminum garnet Tm3+:YAG (Tm3+:Y3Al5O12) have been investigated at temperatures T = 78 and 293 K, respectively. Based on the analysis of the magnetooptical and optical spectra, the optical transitions between the Stark sublevels of the 3 F 4 and 1 D 2 multiplets in Tm3+:YAG were identified. It is shown that the symmetry and energies of the Stark sublevels of the 3 F 4, 1 D 2, and 3 H 6 multiplets, found experimentally from magnetic and magnetooptical studies, confirm the results of theoretical calculations of the energy spectrum of the rare earth Tm3+ ion in YAG.
Yttrium aluminum garnet (YAG): Pr3+ is synthesized by codeposition me thod. Vacuum ultraviolet (VUV) excitation and emission spectra of YAG: Pr3+ at different temperatures are measured using synchrotron radiation as an excitation source. We analyze the transition process after excitation to 4f5d en ergy band and estimate the Huang-Rhys factor S and phonon energy ηω of YAG: Pr 3+ by multi-phonon relaxation. Emission of self-trapped exciton (STE) and 3P0→3H4,5,6 emission transferr ed from the STE energy appear when YAG: Pr3+is excited by 170nm, whic h is a different transition process from those excited by 240nm and 289nm.