Abstract
Three-dimensional laser-induced crystallization of glass via localized heating by focused femtosecond laser irradiation promises the ability to create photonic integrated circuits. However, little work thus far has been done to demonstrate the feasibility of this technique to create crystals in rare earth-doped glasses that may serve as active elements of the circuit, such as lasers. To that end, crystals were grown in ErxLa1−xBGeO5 (x = 0.0, 0.01, 0.04) glasses via this technique and characterized using Raman and fluorescence spectroscopy. Erbium was found to be primarily incorporated within the crystal at the lanthanum site and its energy levels were quantified. The influence of different glass compositions and laser irradiation parameters on the strain gradient within the crystal cross-section as well as the erbium fluorescence is discussed.
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