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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9052415 B1

PDFFull Text
Date of Patent:
Jun. 09, 2015

Filed:

Mar. 15, 2012

Magneto-optical ceramic material and method for selecting same

Applicant:

Tadakatsu Shimada, Annaka, JP;

Inventor:

Tadakatsu Shimada, Annaka, JP;

Assignee:

SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;

Attorney:

Westerman, Hattori, Daniels & Adrian, LLP

Primary Examiner:

Bijan Ahvazi

Int. Cl.
CPC ...
C09K 9/00 (2006.01); G02F 1/00 (2006.01); G02B 1/00 (2006.01); C04B 35/50 (2006.01); C04B 35/505 (2006.01); C04B 35/645 (2006.01); C01F 17/00 (2006.01); G02B 27/28 (2006.01); G02B 9/00 (2006.01);
U.S. Cl.
CPC ...
G02B 1/00 (2013.01); C04B 35/50 (2013.01); C04B 35/505 (2013.01); C04B 35/6455 (2013.01); C04B 2235/3224 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3227 (2013.01); C04B 2235/3232 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/604 (2013.01); C04B 2235/85 (2013.01); C04B 2235/9653 (2013.01); C01F 17/0043 (2013.01); C01P 2002/50 (2013.01); C01P 2006/60 (2013.01);
Abstract

The present invention relates to a magneto-optical ceramic material which is characterized by being configured of an oxide ceramic that is mainly composed of an oxide that is represented by formula (1): (TbRe)O(wherein Re represents at least one element that is selected from among scandium, yttrium, lanthanum, europium, gadolinium, ytterbium, holmium and lutetium, and 0.4≦x≦1.0). The magneto-optical ceramic material is also characterized in that the difference between the refractive index at the grain boundary and the refractive index of the main phase of the oxide ceramic crystal at 25° C. is 0.004 or less. The present invention is capable of reliably providing a magneto-optical ceramic material for Faraday rotators of optical isolators and the like, said magneto-optical ceramic material having good polarization state and large extinction ratio, and enables size reduction of an optical isolator that is used for fiber laser for processing machines.

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