Matsushita Electric Industrial Co., Ltd.

Nippon Sheet Glass Company, Limited

Sumitomo Chemical Company, Limited

The Kansai Electric Power Co., Inc.

Satoshi Ishizuka

Hisashi Minemoto

Nobuki Itoh

Daisuke Ishiko

Yukiko Yoshikawa

Koichi Maeda

Toshifumi Tsujino

Hiroaki Yamamoto

Shigeo Hozumi

Shinichiro Kitayama

Naoto Hirayama

Makoto Sasaki

Motoaki Yoshida

Katsuyuki Fujito

Toshihiro Fujita

Hisanao Sato

Akihiro Miura

Hisayuki Kayanoki

Shoji Mase

Noboru Otani

Osamu Kamada

Kazurou Toda

Kazuro Toda

An optical signal transmission system equipped with a magneto-optical modulator is provided. The magneto-optical modulator works to modulate an optical beam emitted from a light source and consists of a polarizer, a magneto-optical element, an analyzer, a dc field generator, a high-frequency field generator, and an impedance adjuster. The dc field generator works to apply a dc bias field to the magneto-optical element. The high-frequency generator is responsive to the high-frequency signal from said high-frequency signal generator to apply a high-frequency field to the magneto-optical element. The impedance adjuster works to adjust impedance of the high-frequency field generator for establishing effective transmission of the high-frequency signal to the high-frequency field generator, thereby increasing a modulation range up to frequencies higher than an upper limit of typical magneto-optical modulators. The application of the dc bias field and use of the impedance adjuster realizes the magneto-optical modulator which is useful up to a ferromagnetic resonance frequency.

Optical signal transmission system and magneto-optical modulator designed to establish modulation over wide range for use in the same

An optical magnetic field sensor probe for detecting a magnetic field to be measured as an output light intensity, by disposing a polarizer, a magneto-optical device, and an analyzer mutually different in the transmission and polarization direction with respect to said polarizer, along the running direction of light, has an input optical fiber for feeding into to said polarizer through a first lens, and an output optical fiber for emitting an output light from said analyzer through a second lens, wherein said input optical fiber, said first lens, said magneto-optical device, said second lens and said output optical fiber are composed in a confocal optical system, and said first lens and said second lens are drum lenses.

Optical magnetic field sensor probe

Magneto-optical element

A second-order nonlinear optical material comprises a glass body poled from a first direction and a second direction, which differ from each other, so that the glass body exhibits little birefringence relative to a beam being propagated in a third direction substantially vertical to said first direction and said second direction, respectively, wherein said glass body comprises a major proportion of SiO,and a minor proportion of germanium. A method for making the material, and optical modulator devices comprising the material are also described.

Method for making a second-order nonlinear optical material, the material obtained by the method, and an optical modulation device comprising the material

Optical magnetic field sensor probe having drum lenses

An optical fiber modulator comprises an optical fiber, a substrate having a groove pattern in which the optical fiber is fixed, and a modulation unit including a polarizer, an electrooptic element, and an analyzer aligned in a light path of the optical fiber in this order, wherein the electrooptic element is made of a poled portion of the optical fiber, and when the electrooptic element is in an electric field-free condition, an absolute value, .delta., of a phase difference of a beam passed through the electrooptic element is within the following range

Optical fiber modulator having an optical fiber having a poled portion

A magneto-optical element comprises a film of a Bi-substituted rare earth iron garnet selected from garnets of the following chemical formulas

Magneto-optical element and optical magnetic field sensor using the same

An optical magnetic-field sensor has: a GRIN rod lens; optical fiber for incident light and optical fiber for outgoing light, which are arranged on one end of the GRIN rod lens; first and second reflection mirrors both being on the other end of the GRIN rod lens; and a magneto-optical crystal between the first and the second reflection mirrors, wherein light leaving the optical fiber for incident light is converted into convergent light by the GRIN rod lens , the convergent light is reflected by the first reflection mirror so that an optical axis of the convergent light is substantially vertical to the central axis of the GRIN rod lens , and that the convergent light is focused on the central axis of the GRIN rod lens , the reflected light passes through the central axis and is converted into divergent light, the divergent light is then reflected by the second reflection mirror which is placed at a position being symmetrical with the first reflection mirror, relative to the central axis, the reflected divergent light is converted into convergent light by the GRIN rod lens again to be fed into the optical fiber for outgoing light.

Optical fiber magnetic-field sensor

An optical fiber sensor which comprises a substrate having a groove pattern, an optical fiber which includes a shaped, bare optical fiber portion of an inverted U form and capable of being received or accommodated in the groove pattern of the substrate, and jacketed optical fiber portions extending from the shaped optical fiber rod portion at opposite ends thereof, and an optical modulation unit which is fixedly provided in a light path of the bare optical fiber portion and placed in at least one groove formed in the substrate. A method for fabricating the sensor is also described. The sensors include magnetic filed/current, electric field/voltage and temperature sensors.

Optical fiber sensors and method for making the same

A plastic lens formed by laminating, in the order as described below, (A) a plastic lens substrate having a refractive index in the range of 1.50 to 1.70, (B) a primer layer containing a metal compound of at least one metal selected from the group consisting of Al, Ti, Zr, Sn and Sb and a polyurethane, or (B') a primer layer formed from a polyurethane containing at least one element selected from the group consisting of Cl, Br, I and S, (C) a hard coating layer, and (D) a single-layered or multi-layered anti-reflection layer formed by vapor-depositing an inorganic substance.

Plastic lens

A process for producing a light control plate which selectively scatters incident light of a specific angle, which comprises:

Process for producing light control plate

A process for producing a light control plate, which comprises

Growing community of inventors

Hirakata, Japan

Satoshi Ishizuka