Abstract
Erbium (Er3+)-doped ytterbium garnet [(Er x Yb1-x )3Al5O12; x = 0.005, 0.02 and 0.1, YbAG] planar waveguides have been prepared by an aqueous sol–gel method using polyvinylpyrrolidone as a gelling agent. The thermal behavior of gel was studied by thermogravimetry and differential thermal analysis. The phase composition of the films was determined using X-ray diffraction. Surface analysis was carried out by atomic force microscopy. A pure infrared emission of Er3+ ions was observed in all prepared films. Light propagation was studied by m-line spectroscopy using several wavelengths (633, 964, 1311 and 1552 nm). The minimum coating cycles to observe one propagated mode at 1552 nm were determined to be 7. The sol–gel-derived Er:Yb3Al5O12 seems to be a promising material for light amplifiers in the IR region.
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