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AssigneeNippon Telegraph and Telephone Corporation
InventorsTakeshi Umeki, Takushi Kazama, Takahiro Kashiwazaki, Koji Embutsu, Osamu Tadanaga, Asuka Inoue, Ryoichi Kasahara
Estimating the term…
A highly-efficient ridge waveguide includes a base substrate of a single-crystal and a core substrate made of a nonlinear optical medium, the base substrate and the core substrate being directly bonded, and includes a thin film layer formed on a surface of the core substrate on the upper side of a periodically polarization-reversed structure, and becomes a wavelength conversion element. A direct bonding method through thermal diffusion is applied to bonding. The core substrate has a ridge structure formed in a light propagating direction and a reversed structure formed by processing this. A surface of the core substrate is ground and a thin film layer is formed on the ground surface. A core formed by digging a core layer of the core substrate in an unbonded state is provided on an upper surface of an undercladding layer of the base substrate in a bonded state. Two side surfaces of the core are in contact with an air layer.
An optical element comprising:
A method of manufacturing an optical element including a first substrate of a single-crystal and a second substrate made of a nonlinear optical medium or an electro-optic medium, the first substrate and the second substrate being bonded, the method comprising:
An optical element comprising:
Dependencies are inferred from the claim text.