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11 July 2000 Preferential input and output coupling of oval-shaped optical microcavities: fluorescence emission from oval-shaped dye-doped glass fibers
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Abstract
We report an experimental study of the preferential input and output side coupling of oval-shaped optical microcavities. The cavity was in the cross-section of an oval-shaped dye-doped glass fiber, which was optically pumped perpendicular to the fiber axis. Fluorescent emission perpendicular to the fiber axis was imaged with a lens onto a CCD camera. The integrated intensity of the image profile at different angles provided the far-field angular pattern of the fluorescent emission peaked at ~ 45 degree(s) relative to the cavity major axis. The near-field spatial profiles revealed refractive output coupling from an extended high- curvature region. A simple ray-path model was used to calculate the fluorescent near-field spatial profile. Preferential input side coupling was also observed in the direction ~45 degree(s) relative to the cavity major axis. By focusing the pump beam at the high-curvature region in the preferred coupling direction, we observed ~ a factor of 8 enhancement in the integrated intensity at the preferred fluorescence output angle. By imaging the fiber top surface, we demonstrated that the preferentially input coupled light could be guided along the cavity circumference.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrew W. Poon, Steven L. Kan, Paul A. Tick, Daniel A. Nolan, and Richard K. Chang "Preferential input and output coupling of oval-shaped optical microcavities: fluorescence emission from oval-shaped dye-doped glass fibers", Proc. SPIE 4078, Optoelectronic Materials and Devices II, (11 July 2000); https://doi.org/10.1117/12.392149
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