Erbium-doped Y20 3 planar optical waveguides have been fabricated by spray-pyrolysis deposition. The attenuation spectrum of the waveguide shows peaks that are due to absorption of the erbium ions. The as-deposited layers also show photoluminescence sharply peaking at 1540 nm with additional Stark splitting. The thin layers of Er 3:Y 203 obtained are promising for the realization of integrated-optic amplifiers and lasers.
Hoekstra, T. H., Hilderink, L. T. H., Lambeck, P. V., & Popma, T. J. A. (1992). Photoluminescence and attenuation of spray-pyrolysis deposited erbium-doped Y2O3 planar optical waveguides. Optics letters, 17(21), 1506-1508. https://doi.org/10.1364/OL.17.001506