Abstract
In this work, we investigated the thermo-optical properties of highly Nd3+ doped YAG ceramics. The normalized lifetime thermal lens method was used to obtain the fluorescence quantum efficiency (η) versus Nd3+ concentration (Nt) and to study the energy transfer microparameters CDD and CDA. The Nt dependence of η was compared to the results of the previous literature. The CDA found is very similar to those of the previous literature, while the CDD is very different and higher than CDA, although the main dependence of η with Nt is assigned to CDA. The figure of merit (η.Nt versus Nt) indicated a maximum around 3.8 at.% Nd2O3, which in addition to the very low ds/dT value, evidences the YAG ceramic as an excellent material for an ultra-high-power microchip laser system and for devices requiring minimum pump-induced local heating generation.
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