J. Phys. IV France 01 (1991) C7-343-C7-345
ORIGIN OF THE INFRARED ABSORPTION IN LaMgAl11O19 : Ti3+ A POTENTIAL LASER MATERIALB. MARTINAT, A.M. LEJUS and D. VIVIEN
Chimie Appliquée de l'Etat Solide, URA 1466 ENSCP, 11 rue Pierre et Marie Curie, F-75231 Paris cedex 05, France
The LaMgAl11O19 matrix (magnetoplumbite structure) activated with Ti3+ could present broadly tunable laser action between 650 and 1000 nm. The optical absorption measurements show, in addition to the 2T22E transition of Ti3+, two unexpected infrared bands. The first one, peaking at 730 nm, is attributed to an intervalence charge transfer transition of Ti3+ - Ti4+ pairs located in (4f) sites. The second one, at 960 nm, is attributed to a Ti2+ - Ti3+ charge transfer transition. These bands which occur in the range of the Ti3+ fluorescence wavelengths have to be suppressed for the lasing application of this material.
© EDP Sciences 1991