Abstract

We present a broad-band distributed Bragg reflector (DBR) recorded directly in Z-cut channel Ti:LiNbO₃ waveguides, those photorefractive sensitivity has been increased by a recently developed technique of proton-assisted copper exchange that provides a doping level much higher than that available with the commonly used indiffusion and bulk doping techniques. Unique mechanism of photorefractive recording, having no equivalent in bulk materials, was used for fabrication of a holographic grating in Z-cut LiNbO₃ waveguides. In a first approach we obtain a reflectivity of 17 % and bandwidth (FWHM) of 1.2 nm for IR light with center wavelength 1534.3 nm.

© 2003 Optical Society of America