| 摘要 |
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 |
