Photorefractive BaTiO(3) spheres and spherical disks.

@article{Damiao2001PhotorefractiveBS,
  title={Photorefractive BaTiO(3) spheres and spherical disks.},
  author={Valeria B. Damiao and Edeline Fotheringham and Vladimir Nikolaevich Shkunov and Leslie Czaia and Dana Z. Anderson},
  journal={Optics letters},
  year={2001},
  volume={26 9},
  pages={
          611-3
        }
}
We have produced single-crystal spheres and spherical disks of photorefractive barium titanate (BaTiO(3)) . 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. 
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