Abstract

Monocrystalline lattice matched Er(0.6at.%):(Gd,Lu)2O3 films with nearly atomically flat surfaces and thicknesses up to 3μm have been grown on Y2O3 substrates using pulsed laser deposition. The emission cross sections were comparable with the ones of Er:Y2O3 bulk crystals, showing only a marginal spectral broadening. Rib channel waveguiding could be demonstrated after structuring the films with reactive ion etching. Gain measurements have been performed and the results compared with a theoretical gain spectrum. A gain of 5.9dBcm could be measured at 1535.5nm through in-band pumping at 1480nm. The scattering losses in such a 7mm long rib waveguide have been determined to be below 4.4dB at 632.8nm. An extrapolation to the gain wavelength with the λ4-Rayleigh law of scattering resulted in losses of 0.2dBcm at 1.5μm.

© 2008 Optical Society of America

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