Abstract
Raman spectra of a LiNbO3:Cu ([Cu] = 0.015 mass%) crystal grown from the melt of congruent composition and a crystal of stoichiometric composition (LiNbO3stoich) that was grown from the melt with 58.6 mol% Li2O were studied upon excitation in the UV, visible, and near-IR regions. It was found that the intensities of forbidden lines for LiNbO3stoich crystal were linear functions of the exciting radiation wavelength whereas a clearly resolved maximum in the visible region was observed for LiNbO3:Cu crystal ([Cu] = 0.015 mass%). This was possibly due to the fact that the photorefractive effect for the LiNbO3stoich crystal was determined by intrinsic defects; for the LiNbO3:Cu crystal ([Cu] = 0.015 mass%), by both intrinsic defects and photorefractive copper cations.
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