FARADAY ROTOR, OPTICAL ISOLATOR AND OPTICAL PROCESSING EQUIPMENT

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The object(s) of the invention is to provide a Faraday rotator, an optical isolator, and optical processing equipment, which has a transmittance higher than that of TGG, is capable of upsizing, and has a higher performance index in the visible wavelength region in general, and on wavelengths of up to 400 nm in particular. The Faraday rotator is characterized by containing as a main component a fluoride represented by the following general formula (1) or (2) : [in-line-formulae]RE1F3-x  (1)[/in-line-formulae] [in-line-formulae]LiRE2F4-x  (2)[/in-line-formulae] where 0≦x<0.1, and RE1 or RE2 is at least one element selected from the group of rare earth elements.