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.:
Date of Patent:
Dec. 02, 2025
Filed:
Mar. 28, 2022
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
Akira Yahagi, Takasaki, JP;
Shinji Makikawa, Takasaki, JP;
SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;
Abstract
An optical isolator for a wavelength band of 400 to 470 nm includes: a Faraday rotator having a Verdet constant equal to or greater than 750 Rad/T·m at a wavelength of 400 nm to 470 nm; and a hollow magnet provided on an outer periphery of the Faraday rotator, wherein a magnetic flux density B(T) applied to the Faraday rotator is within the range of the following formula (1), and an optical path length L(cm) over which the Faraday rotator is provided is within the range of the following formula (2): B≤0.40 (1); 0.26≤L≤0.50 (2). Thus, a miniaturized optical isolator which is transparent at violet and blue wavelengths of 400 to 470 nm is provided.