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Nd:YAG quantum efficiency and related radiative properties

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3 Author(s)
Devor, D.P. ; Hughes Res. Lab., Malibu, CA, USA ; DeShazer, L.G. ; Pastor, R.C.

Measured quantum efficiencies of ten different Nd:YAG crystals show a variation from 0.47 to 0.87. In phototropic crystals, the quantum efficiency can be degraded by color center formation or improved by bleaching. Color center bleaching occurs by oxidation, using a high-temperature reactive atmosphere process to control crystal defects related to hydroxyl impurities. Ion-ion and ion-lattice interaction effects are examined for further evidence of Nd3+ fluorescence quenching centers. Fluorescence rates, nonequivalent crystal field (NCF) effects, line broadening, Nd+3 lattice-defect interactions, and their temperature dependences are studied. Nd3+ site perturbations occur in all crystal samples. Five NCF Nd3+ sites show 6 cm-1 site-to-site Stark level shifts at liquid helium temperatures. Smaller scale shifts are characteristic of particular samples. While the crystals examined show individual differences, only hydroxyl-related coloration provides specific evidence of quenching centers

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Quantum Electronics, IEEE Journal of  (Volume:25 ,  Issue: 8 )