OPTICAL PROPERTIES OF Cr3 ION IN LaMgAl11O19 and La1-x Ndx MgAl11O19Reportar como inadecuado




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Abstract : Lanthanum-magnesium hexaaluminate LaMgAl11O19 with magnetoplumbite-like structure is a remarkable good laser host for Nd3+ ions LNA. In this study Cr3+ ions are introduced as an activator LaMgAl11-xCrxO19 or as a sensitizer La1-xNdxMgAl11O19 in this matrix. ESR and optical spectra of LaMgAl11-xCrxO19 crystals reveal 3 kinds of sites for Cr3+ : 4f, 2a and 12k. The presence of 4T2 - 4A2 broad band fluorescence makes this material a possible candidate for a red or IR emitting vibronic laser. Optical properties of La1-xNdxMgAl11O19 reveal that both radiative and non-radiative Cr3+ - Nd3+ energy transfers occur in this material. This allows to increase the laser emission ratio compared with single doped LNA.





Autor: B. Viana V. Poncon C. Garapon A. Lejus D. Vivien G. Boulon

Fuente: https://hal.archives-ouvertes.fr/



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