Patent ID: 6516127
Filing Date: 2003-02-04
Classification: G02B

Abstract:
An apparatus comprising a waveguide, the waveguide manufactured from a non-linear optical crystal having a first surface, with a barrier layer in the crystal, the refractive index of which is lower than the refractive index of the crystal and which limits the waveguide in a direction vertical to the first surface, the material of the crystal being chemically unchanged in the barrier layer, but physically changed, inasmuch as the barrier layer contains ions and manifests deliberate radiation damage caused by the presence of the ions, as a result of which its refractive index is lower than that of the crystal, the waveguide further designed as a rib waveguide with a rib on the first surface, the walls of the rib limiting rib waveguide in a direction parallel to the first surface and the height of the rib above the first surface amounts to at least 0.5 micrometer.