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We report on the characterization of sol-gel derived lithium niobate viatrivalent chromium probe ions, a study that is motivated by recent reports onthe synthesis of high quality sol-gel lithium niobate (LiNbO$_3$). In order toassess the quality of sol-gel derived LiNbO$_3$, we incorporate Cr$^{3+}$during the hydrolysis stage of the sol-gel process. A comparison of theCr$^{3+}$ emission and photo-excitation data on both sol-gel and melt-grownLiNbO$_3$ shows that the sol-gel derived material is highly stoichiometric

Optical spectroscopy of trivalent chromium in sol-gel lithium niobate