Abstract
Based on the four-level system, a theoretical model of diode-laser end-pumped fundamental continuous-wave Nd3+:YAG ceramic microchip lasers is proposed. The fluorescence concentration quenching effect and the absorption efficiency of the host have been taken into account in the model. The theoretical results of the numerical calculations are in good agreement with those of experiments. The effects of the concentration of the Nd3+:YAG ceramic, the thickness of the Nd3+:YAG ceramic, and the transmission of the output coupler on the laser performance (threshold and output power) are addressed. The optimization of the concentration and the thickness for the Nd3+:YAG ceramic microchip laser is presented. This modeling is not only applicable to the Nd3+:YAG ceramic microchip laser but also to other four-level microchip lasers.
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