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Abstract

Provided is a magneto-optical material which does not absorb fiber laser light in a wavelength range of 0.9-1.1 μm and does not cause a thermal lens, while having a larger Verdet constant than TGG crystals, and which is suitable for constituting a magneto-optical device such as an optical isolator. This magneto-optical material is formed of a single crystal of a rare earth oxysulfide that is represented by formula (1) or a transparent ceramic which contains, as a main component, a rare earth oxysulfide that is represented by formula (1), and this magneto-optical material has a Verdet constant of 0.14 min/(Oe·cm) or more at the wavelength of 1,064 nm.

description='In-line Formulae' end='lead'(Tb_xR_1-x)₂O₂S  (1)description='In-line Formulae' end='tail'

(In the formula, x is 0.3 or more but less than 1; and R represents at least one rare earth element that is selected from the group consisting of yttrium, lutetium, gadolinium, holmium, scandium, ytterbium, europium and dysprosium.)

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First Claim