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Frequency upconversion of Er3+ in alkali lanthanum gallate glasses (Na2O-La2O3-Ga2O3 or NLG) was investigated. Visible emissions at 532, 546, and 660 nm corresponding to the 2H11/2→4I15/2, 4S3/2→4I15/2, and 4F9/2→4I15/2 transitions were observed under con