The optical processing device

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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) : €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒRE1F 3-x €ƒ€ƒ€ƒ€ƒ€ƒ(1) €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒLiRE2F 4-x €ƒ€ƒ€ƒ€ƒ€ƒ(2) where 0‰¦x<0.1, and RE1 or RE2 is at least one element selected from the group of rare earth elements.