Nippon Electric Glass Co., Ltd.

Futoshi Suzuki

Osamu Odani

Provided is a magnetic circuit which, with the use in an optical isolator, is less likely to cause the polarizer to be damaged even with higher laser output power. A magnetic circuitincludes first to third magnetstoeach provided with a through hole allowing light to pass through and is composed of the first to third magnetstoarranged coaxially in this order in a front-to-rear direction, wherein one of the first and third magnetsandis magnetized in a direction Y perpendicular to a direction X of an optical axis to have a north pole located toward the through hole, the other of the first and third magnetsandis magnetized in a direction Y perpendicular to the direction X of the optical axis to have a south pole located toward the through hole, the second magnetis magnetized in a direction parallel to the direction X of the optical axis to have a north pole located toward the one of the first and third magnetsandhaving the north pole located toward the through hole, and a length L1 of the first magnetalong the direction X of the optical axis is different from a length L3 of the third magnetalong the direction X of the optical axis.

Magnetic circuit, faraday rotator, and magneto-optic device

A Faraday rotator includes a magnetic circuit including first to third magnetic materials each provided with a through hole through which light passes, and a Faraday element disposed in the through hole. When a direction where light passes through the through hole is defined as a direction of an optical axis, the first magnetic material is magnetized in a direction perpendicular to the direction of the optical axis, the second magnetic material is magnetized in a direction parallel to the direction of the optical axis, and the third magnetic material is magnetized in a direction perpendicular to the direction of the optical axis, and a length of the Faraday element along the direction of the optical axis is shorter than a length of the second magnetic material along the direction of the optical axis.

Faraday rotator and magneto-optical element

Provided is a magneto-optic element that enables easy size reduction of an optical isolator. A magneto-optic element is formed of two or more magnetic members joined together.

Magneto-optic element and method for producing same

Provided is a method for producing a glass material by a containerless levitation technique, which enables production of a large-sized glass material. The method includes the steps of: preparing a forming member and a cover member, the forming member including a gas jetting portionin which a plurality of gas jet holesfor use in levitating a block of glass raw material are formed, the cover memberwhich is capable of covering a peripheral portion of a gas jetting surfaceof the gas jetting portionand in which a controlling surfacecontrolling, near the peripheral portion of the gas jetting surface, a flow of gas jetted through the gas jet holesis formed and an openingcapable of releasing the gas to outside is formed; placing the block of glass raw material on top of the gas jetting surfaceand covering the peripheral portion of the gas jetting surfacewith the cover member; and heating the block of glass raw material to melting while holding the block of glass raw material levitated by jetting the gas through the gas jet holesand then cooling the melted block of glass raw material.

Method for producing glass material and apparatus for producing glass material

Provided is a glass material that can satisfy both a high Faraday effect and a high light transmittance in a short wavelength range. A glass material contains, in % by mole, 30 to 50% PrOand 0.1 to 70% BO+PO.

Glass material and method for manufacturing same

Provided is a glass material that can satisfy both high Faraday effect and high light transmittance at wavelengths used. A glass material containing, in terms of % by mole of oxide, more than 40% TbOand having a percentage of Tbof 55% by mole or more relative to a total content of Tb.

Provided is a glass composition that exhibits greater Faraday effect than ever before. A glass composition contains 48% or more of TbO(exclusive of 48%) in % by mole.

Growing community of inventors

Otsu, Japan

Futoshi Suzuki