Al<sub>2</sub>O<sub>3</sub> slab waveguide films were doped with erbium using ion implantation to a peak concentration of 1.5 at. %. Prism coupling measurements show absorption caused by <sup>4</sup><i>I</i><sub>15/2</sub> →<sup>4</sup><i>I</i><sub>13/2</sub> intra-4<i>f</i> transitions in Er<sup>3+</sup> with a maximum at 1.530 μm of 8 dB/cm. The Er<sup>3+</sup> absorption cross section is determined as a function of wavelength. We used the McCumber theory to derive the emission cross section spectrum from the absorption results, which we then compared with the Er<sup>3+</sup> photoluminescence spectrum. The peak absorption and emission cross sections are found to be 6 × 10<sup>−21</sup> cm<sup>−2</sup>. The results are used to predict the optical gain performance of an Er-doped Al<sub>2</sub>O<sub>3</sub> optical amplifier that operates around 1.5 μm.
© 1997 Optical Society of America
Gerlas N. van den Hoven, Jan A. van der Elsken, Albert Polman, Cor van Dam, Koos W. M. van Uffelen, and Meint K. Smit, "Absorption and emission cross sections of Er3+ in Al2O3 waveguides," Appl. Opt. 36, 3338-3441 (1997)