FARADAY ROTATOR, AND MANUFACTURING METHOD OF THE SAME

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PROBLEM TO BE SOLVED : To provide a Faraday rotator and a manufacturing method of the Faraday rotator that suppress the increase of the insertion loss even when it is incorporated in an optical isolator for a high-output laser of a wavelength of 1.1 μm or less and an output of 5 W or more, and also suppress the peeling of an RIG film and a sapphire substrate for heat radiation. SOLUTION : In the Faraday rotator, a sapphire substrate for heat radiation is disposed on each of both surface sides of a bismuth-substituted type rare-earth iron garnet film (RIG film) produced by a liquid phase epitaxial method. Bonded surfaces of the sapphire substrates 2 and 2 for heat radiation to the RIG film 1 are mirror-polished. The RIG film is directly bonded to the sapphire substrates for heat radiation by a surface-activation room-temperature bonding method without using an adhesive agent. An antireflection film is not disposed on the bonded surfaces of the sapphire substrates for heat radiation to the RIG film. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2016, JPO&INPIT