ELECTRO-OPTIC ELEMENT

摘要

An electrooptical device characterized by comprising a ferroelectric substra te which is made of a single crystal having an electrooptical effect, and has a n optical waveguide in which titanium is thermally diffused on a major surface and an axis along which the electrooptical effect is induced is parallel to the major surface, a heat-treated buffer layer provided on the major surface , an electrode provided on a part of the buffer layer, and a protective layer provided at least in an area where the electrode is not formed on the buffer layer in order to prevent the buffer layer from being contaminated.