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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.

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First Claim