Abstract
Monocrystalline lattice matched films with nearly atomically flat surfaces and thicknesses up to have been grown on substrates using pulsed laser deposition. The emission cross sections were comparable with the ones of 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 could be measured at through in-band pumping at . The scattering losses in such a long rib waveguide have been determined to be below at . An extrapolation to the gain wavelength with the -Rayleigh law of scattering resulted in losses of at .
© 2008 Optical Society of America
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