Abstract
Abstract This article reviews the current knowledge on the main properties and applications of hydrogen in LiNbO3. The review is divided into three parts. The first is devoted to general properties such as methods of defect production and control, techniques used for their detection and characterization, as well as interactions with other lattice defects. The second part considers the central role played by OH- defects in the fabrication of optical waveguides by the protonexchange method. Conditions for the exchange process, the structure of exchanged layers, optical properties of exchanged waveguides and connection with relevant practical devices are examined. Finally, the third part discusses the production of permanent volume photorefractive gratings by the fixing process, where OH- ions are also considered to be the main responsible defects. In particular, the physics of the fixing process, current mathematical models and two major applications are discussed.
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