Amplied spontaneous emission from optically pumped thin-lm waveguides of poly(9,9-dioctyluorene) (F8) has been mea-sured to study the inuence of interface roughness on transmission loss within F8 waveguides. It is found that the transmission losscoeci...
Amplied spontaneous emission from optically pumped thin-lm waveguides of poly(9,9-dioctyluorene) (F8) has been mea-sured to study the inuence of interface roughness on transmission loss within F8 waveguides. It is found that the transmission losscoecient at the emission wavelength is reduced with increasing thickness of the waveguides. A theoretical model is employed toexplain the relationship between the transmission loss of F8 waveguides and their thickness. The model explains the relationshipfound experimentally. A major source of loss is shown to be due to nanometer-size interface roughness of F8 waveguides. Suchinformation is valuable for the design of organic solid-state lasers.