公开(公告)号：US20210026165A1

公开(公告)日：2021-01-28

申请号：US17042839

申请日：2019-02-27

Applicant: SUMITOMO OSAKA CEMENT CO.,LTD.

Inventor： Katsutoshi KONDO ,  Kiyotaka NAKANO ,  Eiji MURAKAMI ,  Junichiro ICHIKAWA

IPC: G02F1/035

Abstract: To provide an optical element in which an electrode is directly formed on an LN substrate, and a drift phenomenon is suppressed. In an optical element including: a substrate made of lithium niobate crystals; and an electrode disposed on the substrate, the substrate and the electrode are in direct contact with each other, and as a contact metal disposed on a surface of the electrode where the electrode is in contact with the substrate, a metal material whose standard enthalpy of formation per coordinate bond upon oxidation is greater than a standard enthalpy of formation per coordinate bond of niobium pentoxide is used.