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US 9,429,778 B2Granted
Optical isolator for a wavelength band of 600-800 nm
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsAkira Yahagi, Toshiaki Watanabe, Shinji Makikawa
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Abstract
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 (TbxR1-x)2O3 such that 0.5≦x≦1.0, and R is scandium, yttrium or any lanthanoid but Tb.
Claims6
A optical isolator for use with a wavelength band of 600-800 nm, comprising:
- a Faraday rotator made of an oxide material containing an oxide represented by formula (I) in an amount of 99% or higher and having a Verdet constant of 0.90 min/Oe·cm or greater at a wavelength band of 633 nm, and
- a hollow magnet arranged to surround the Faraday rotator,
- wherein a sample length L (cm) through which the Faraday rotator is arranged is in a range represented by an inequality (1) and that magnetic flux density B (Oe) impressed on the Faraday rotator is in a range represented by inequality (2),
- wherein the formula (I), the inequality (1), and the inequality (2) are
- (TbxR1-x)2O3 (I)
- wherein 0.5≦x≦1.0, and R is at least one element selected from scandium, yttrium and any lanthanoid but Tb,
- 0.6≦L≦1.1 (1), and
- B≦0.5×104 (2).
5 more elements
Dependencies are inferred from the claim text.