Issue
J. Phys. Colloques
Volume 48, Number C7, Décembre 1987
1st International Laser M2P Conference
Page(s) C7-505 - C7-507
DOI https://doi.org/10.1051/jphyscol:19877120
1st International Laser M2P Conference

J. Phys. Colloques 48 (1987) C7-505-C7-507

DOI: 10.1051/jphyscol:19877120

OPTICAL PROPERTIES OF Cr3+ ION IN LaMgAl11O19 and La1-x Ndx MgAl11O19

B. VIANA1, V. PONCON2, C. GARAPON2, A.M. LEJUS1, D. VIVIEN1 and G. BOULON2

1  Chimie Appliquée de l'Etat Solide, ENSCP, 11, Rue Pierre et Marie Curie, UA 302, F-75231 Paris Cedex 05, France
2  Physico-Chimie des Matériaux Luminescents, Université Claude Bernard, Lyon I, UA-442, 43, Bd du 11 novembre 1918, F-69622 Villeurbanne Cedex, France


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.