Kabushiki Kaisha Toshiba

Shin-etsu Chemical Co., Ltd.

Fujitsu Corporation

Other

Toyo Seikan Kaisha, Ltd.

Mitsubishi Kasei Corporation

Mitsubishi Chemical Industries Limited

Tokai Aluminum Foil Co., Ltd.

Mitsubishi Chemical Corporation

Ajinomoto Co., Ltd.

Panasonic Communications Co., Ltd.

Oji Yuki Goseishi Co., Ltd.

Tokai Aluminum Fiol Co., Ltd.

Kowa Company Limited

Toshiaki Watanabe

Yoshihiro Kikuchi

Takeshi Chujoh

Kenshi Dachiku

Takeshi Nagai

Takashi Ida

Noboru Yamaguchi

Takaaki Kuratate

Toshihiko Ryuo

Yoko Sambonsugi

Yasuhiro Morinaka

Masayuki Tanno

Tetsuo Soejima

Hiroyoshi Nishi

Shinji Makikawa

Kazuo Iguchi

Satoshi Yuki

Hiroko Sakurai

Toshimitsu Kaneko

Osamu Hori

Hisao Fujiwara

Yoshio Hayashi

Kazunori Yamada

Akio Yamanaka

Nobuko Fukushima

Haruhiko Okumura

Goh Itoh

Hideyuki Ueno

Hitoshi Kobayashi

Shigeo Amemiya

Yoshiyuki Shiono

Kazuo Murano

Fumio Sugiyama

Chiaki Kanai

Satoru Fukuda

Katsuhiko Iseki

Akira Yahagi

Rieko Furukawa

Yukio Kohama

Hirotaka Naruse

Shinichi Sato

Hiroki Yoshikawa

Toru Miura

Seiichi Sato

Katsuhiro Imazu

Tadaaki Ohgiya

Hiroaki Komine

Hiroshi Matsubayashi

Ikuo Komatsu

Jun Horikoshi

Tomohiro Shinomiya

Hisashi Hotta

Toshiji Kanayama

Shinya Otsuka

Junya Tagashira

Yoshikuni Matsumura

Kazuo Ohzeki

Takashi Toyoda

Shinji Ohta

Hajime Yamada

Mitsuru Ohba

Ryohei Sekimoto

Rie Ishida

Hitomi Aoki

Yasuji Hosono

Takashi Funato

Kazuo Ozeki

Masatsune Shibue

Takashi Miyaji

Masayuki Kawahara

Shuhel Kubota

Shizuo Sugawara

Tomohiro Koyama

Hisaya Oda

Takuya Takahashi

Shin Sugiyama

Makikawa Shinji

A bismuth-substituted rare earth iron garnet single crystal suitable for Faraday rotators and optical isolators with reduced insertion loss due to suppressed valence fluctuation of Fe ions is provided. The bismuth-substituted rare earth iron garnet single crystal of the present invention is characterized by the composition formula (TbLnBiMg)(FeGaTiPt)O. In the composition formula above, 0.02≤f≤0.05, 0.02≤{3−(a+b+c)}≤0.08, and −0.01≤{3−(a+b+c)}−{f+5−(d+e+f)}≤0.01. Ln is a rare earth element and may be selected from Eu, Gd, Ho, Tm, Yb, Lu, and Y.

Bismuth-substituted rare earth iron garnet single crystal, faraday rotator, optical isolator, and method for producing bismuth-substituted rare earth iron garnet single crystal

A Faraday rotator and an optical isolator having a high transmittance and a high Verdet constant are provided. The optical isolator includes at least a Faraday rotator that rotates a polarization plane of incident light in a non-reciprocal manner, a polarizer disposed on a light incident side of the Faraday rotator, and an analyzer disposed on a light exit side of the Faraday rotator. The Faraday rotator is made of an oxide containing ytterbium oxide (YbO), and is manufactured by a ceramic manufacturing process, wherein the oxide is allowed to contain an oxide of a metal other than ytterbium, and the proportion of ytterbium in all metal atoms in the oxide is 80% or more.

Optical isolator and Faraday rotator

An optical isolator includes: an optical isolator chip in which a first polarizer, a Faraday rotator made of a ferromagnet, and a second polarizer are bonded and fixed in this order; and a magnet for applying a magnetic field to the optical isolator chip. A light-entering end surface or a light-exiting end surface of the optical isolator chip is bonded and fixed to a component. On an optical axis of the optical isolator, a center of a magnetic flux formed by the magnet is positioned closer to the end surface side bonded and fixed to the component than a central position of the Faraday rotator on the optical axis. The optical isolator has high bonding reliability to the component.

Optical isolator

A light guide body for optical path and optical axis adjustment, the light guide body includes a silicon single crystal having an extinction ratio of 30 dB or more. The light guide body is a light guide body having one side surface alone joined and fixed to a base. An optical module including the light guide body installed at an installation angle adjusted for optical path and optical axis adjustment between components. An optical path and optical axis adjustment method including adjusting an installation angle of the light guide body to perform the optical path and optical axis adjustment between components. It is possible to provide the light guide body which does not adversely affect polarization characteristics and can easily perform the optical path and optical axis adjustment. It is possible to provide optical module and the optical path and optical axis adjustment method using such a light guide body.

Light guide body, optical module, and optical path and optical axis adjustment method

The present invention provides an optical isolator module, including: a plurality of optical devices, each comprising a Faraday rotator and being configured to have an optical isolator function upon application of a magnetic field, a magnet to apply the magnetic field to the Faraday rotator in each of the plurality of optical devices, wherein at least two optical devices of the plurality of optical devices are configured to have the optical isolator functions in different directions from each other, and each magnetic field applied with the magnet is in the same direction. This provides an optical isolator module that can be prevented from degradation of the performance such as increase of insertion loss and degradation of isolation due to magnetic field interference even when a plurality of optical isolators are close to each other.

Optical isolator module

The present invention is a polarization independent optical isolator including two polarizing separation members each configured to separate polarization components of a transmitted light, an absorptive polarizer arranged on optical paths of separated transmitted lights and corresponding to a plane of polarization of each separated transmitted light, and a Faraday rotator, wherein the Faraday rotator is arranged downstream of the absorptive polarizer in a forward direction. As a result, there can be provided a polarization independent optical isolator that requires no stray light processing of separated optical feedback and shows high isolation.

Polarization independent optical isolator

A small, low-cost 1.5-stage optical isolator has, in a forward direction, incoming light and outgoing light polarization directions that are parallel. The isolator includes a first Faraday rotator, a first polarizer, a second Faraday rotator and a second polarizer arranged in order on a light transmission path, and a magnet arranged so as to apply a same-direction magnetic field to the first Faraday rotator and the second Faraday rotator. Faraday rotation in the first Faraday rotator and Faraday rotation in the second Faraday rotator occur in opposite directions.

Optical isolator and semiconductor laser module

To provide a faraday rotator using a TGG ceramic sintered compact and a light isolator using the faraday rotator such that the influence of scattered light can be relatively reduced and overall characteristics degradation for the entire light isolator is minimized so that a high extinction ratio of at least 38 dB or greater is achieved. [Solution] The faraday rotator according to the present invention uses a TGG ceramic sintered compact having an average particle diameter of 0.2 to 5.0 &#x3bc;m, and has a transmission beam diameter of 0.3 mm or more, the TGG ceramic sintered compact being preferably annealed.

Faraday rotator and optical isolator based on this faraday rotator

A translucent sintered body having the following basic composition:CaYbF, where 0.4&#x2266;&#x2266;1.0,or preferablyCaYbRF, 0.4&#x2266;&#x2266;1.0, 0&#x2266;&#x2266;0.5

Translucent sintered body, a Faraday rotator made of this sintered body, and an optical isolator

A light-transmitting bismuth-substituted rare-earth iron garnet-type calcined body expressed by RBiYeOand having an average crystal particle diameter of 0.3-10 micrometers, and a magneto-optical device using said calcined body; wherein R is at least one kind of elements selected from a group consisting of Y and lanthanoids, and x is a number from 0.5 to 2.5.

Light-transmitting bismuth-substituted rare-earth iron garnet-type calcined material, and magneto-optical device

It is an object of the present invention to provide a magneto-optical material containing as a main component an oxide that includes a terbium oxide and having a large Verdet constant at a wavelength in the 1.06 &#x3bc;m region (0.9 to 1.1 &#x3bc;m) and high transparency, and to provide a small-sized optical isolator suitably used in a fiber laser for a processing machine. The magneto-optical material of the present invention contains an oxide represented by Formula (I), TbR)O, where x satisfies 0.4&#x2266;&#xd7;&#x2266;1.0 and R includes at least one element selected from the group consisting of scandium, yttrium, and lanthanoid elements other than terbium, at a content of at least 99 wt %.

Magneto-optical material, Faraday rotator, and optical isolator

An optical isolator for use with a wavelength band of 600-800 nm is improved in that it has a Faraday rotator made of an oxide material in which said oxide material contains (TbR)Osuch that 0.5&#x2266;x&#x2266;1.0, and R is scandium, yttrium or any lanthanoid but Tb.

Optical isolator for a wavelength band of 600-800 nm

An optical module is provided that includes a Faraday rotator having a Verdet constant at a wavelength of 1.06 &#x3bc;m of at least 0.27 min/(Oe&#xb7;cm), a first hollow magnet disposed on the outer periphery of the Faraday rotator, and second and third hollow magnet units disposed so as to sandwich the first hollow magnet on the optical axis. The second and third hollow magnet units include 2 or more magnets equally divided in a direction of 90 degrees relative to the optical axis. A magnetic flux density B (Oe) applied to the Faraday rotator is in the range of 0.5&#xd7;10&#x2266;B&#x2266;1.5&#xd7;10. The Faraday rotator is disposed on a sample length L (cm) in the range of 0.70&#x2266;L&#x2266;1.10, and has an external diameter D (cm) in the range of 0.20&#x2266;D&#x2266;0.60.

Optical module

An oxide is provided that contains the oxide represented by Formula (I) as the main component thereof, that has a Verdet constant at a wavelength of 1.06 &#x3bc;m of at least 0.18 min/(Oe&#xb7;cm), and that has a transmittance at a wavelength of 1.06 &#x3bc;m and for an optical length of 3 mm of at least 70%,(TbR)O&#x2003;&#x2003;(I)wherein x is 0.4&#x2266;x&#x2266;1.0; R includes at least one element selected from the group consisting of scandium, yttrium, lanthanum, europium, gadolinium, ytterbium, holmium and lutetium.

Oxide and magneto-optical device

An optical isolator including a Faraday rotator that has a high Faraday effect and a high transmission factor in a wavelength used is provided. An optical isolator comprises at least: a Faraday rotator; a polarizer arranged on a light incidence side of the Faraday rotator; and an analyzer arranged on a light exit side of the Faraday rotator, wherein the Faraday rotator consists of an oxide that contains an ytterbium oxide (YbO) with a mass ratio of 30% or more.

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Yokohama, Japan

Toshiaki Watanabe