Abstract

We have produced single-crystal spheres and spherical disks of photorefractive barium titanate $\left({\mathrm{BaTiO}}_3\right)$. The spheres and disks allow direct fiber-to-fiber two-beam coupling without additional optical elements. We also investigate the spontaneous oscillation of triangles and other whispering-gallery modes in these spherical structures.

© 2001 Optical Society of America

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