An optical electronic component, in which strip waveguides of limited depth and lateral width are formed in undoped dielectric substrate, e.g. an undoped crystal, by implantation of rare-earch ions or ions of transition metals, preferably laser-active ions with energies of 50 keV to 10 MeV....http://www.google.de/patents/US5174876?utm_source=gb-gplus-sharePatent US5174876 - Method of making an optical component by ion implantation
