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.

公开(公告)号：US20240329436A1

公开(公告)日：2024-10-03

申请号：US18391264

申请日：2023-12-20

Applicant: SUMITOMO OSAKA CEMENT CO., LTD.

Inventor： Katsutoshi KONDO ,  Junichiro ICHIKAWA

IPC: G02F1/035

CPC classification number: G02F1/035

Abstract: An optical waveguide device includes a first substrate including a first optical waveguide and a low refractive index layer covering the first optical waveguide and being formed of a material having a lower refractive index than a refractive index of the first optical waveguide, and a second substrate joined to the first substrate and including a rib type optical waveguide which is a second optical waveguide and is formed of a material having an electro-optic effect, in which the first optical waveguide and the second optical waveguide have parts optically coupled to each other, and in plan view of the optical waveguide device, a protruding portion is formed in the second substrate in a boundary portion where the first optical waveguide overlaps with the second substrate, and a thickness of the second substrate in the protruding portion is set to be thinner than a thickness of the second substrate in the second optical waveguide.

公开(公告)号：US20210199996A1

公开(公告)日：2021-07-01

申请号：US17129576

申请日：2020-12-21

Applicant: Sumitomo Osaka Cement Co., Ltd.

Inventor： Yuki KUGIMOTO ,  Yumi MURATA ,  Katsutoshi KONDO

IPC: G02F1/035 ,  G02F1/225

Abstract: An optical waveguide device including an optical waveguide substrate that has an electro-optic effect, is a crystal having anisotropy in thermal expansion rate, has a thickness set to 10 μm or lower, and includes an optical waveguide and a holding substrate that holds the optical waveguide substrate, the optical waveguide substrate and the holding substrate being joined to each other, in which the holding substrate is formed of a crystal having a lower dielectric constant than the optical waveguide substrate and having anisotropy in thermal expansion rate, and the optical waveguide substrate and the holding substrate are joined to each other such that differences in thermal expansion rate between the optical waveguide substrate and the holding substrate become small in different axial directions on a joint surface.