Abstract

The efficiency of a sensitized solid state laser material depends critically on energy transfer between the sensitizer (donor) and activator (acceptor) ions. Knowledge of the dependence of transfer efficiency on the host material and dopant concentrations is crucial for the design of an optimized solid state laser medium. The simple phenomenological model presented here has been used to predict Cr—Tm transfer efficiencies in yttrium aluminum garnet (YAG) and yttrium scandium gadolinium garnet (YSGG) laser crystals of several compositions, using material parameters obtained from fitting fluorescence decay kinetics in samples having low dopant concentrations. Agreement between predicted and experimentally determined efficiencies was within 2% in all cases. This model also provided significant insights into the roles of the various basic mechanisms and material properties which determine the efficiency.

© 1990 Optical Society of America

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