Abstract
We report on the concentration effects on active ion emissions in planar waveguides of YAG:RE3+ (RE=Nd, Yb, and Pr) obtained by liquid phase epitaxy on YAG substrates. Liquid phase epitaxy method, which in contrast to the standard Czochralski crystal growth technique, allowed high concentrations of activator, up to 10 at. %, to be obtained. We have investigated emission spectra, the dynamics of the emitting states and the transition linewidths in a wide concentration range. The cross‐relaxation and up‐conversion transfer rates dependence on concentration was determined.
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