| 摘要 |
<p>An optical isolator for use with a wavelength band of 970 - 990 nm is improved in that it has a Faraday rotator made of an oxide material, which contains by 99 % or more an oxide (Tb x R 1-x ) 2 O 3 where 0.5 ‰¦ x ‰¦ 1.0, and R is scandium, yttrium or any lanthanoid but Tb; the resulting Faraday rotator exhibits a Verdet constant of 0.30 min/Oe.cm or greater in the case of the wavelength band of 970 - 990 nm; and a hollow magnet is set to sheathe this Faraday rotator; and the sample length L is from 0.6 cm through 1.0 cm.</p> |
