Abstract

The fluorescence dynamics in Er3+and Yb3+ doped KGd(WO4)2 and KY(WO4)2 has been investigated. Lifetimes have been measured for the Yb  (2F5/2), Er  (4I13/2), and Er  (4S3/2) levels around 1, 1.5, and 0.55μm, respectively. The Yb  (2F5/2) lifetimes show a decreasing trend toward the limiting Er  (4I11/2) lifetime with increasing Er-to-Yb concentration ratio, whereas the Er  (4I13/2) lifetimes are mostly unaffected by the doping concentrations. A rate equation analysis has been performed to explain the observed behavior and gain is calculated for a continuous-wave laser at 1.53μm to find the optimum doping concentrations for high gain.

© 2006 Optical Society of America

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