Faraday rotation angle varying device

摘要

There is provided a Faraday rotation angle varying device in which external magnetic fields are applied from at lease two directions to a garnet single crystal having a Faraday effect and vary a synthesized magnetic field so that Faraday rotation angle of light which transmits through the garnet single crystal is controlled. The device has a base film of garnet single crystal having a rotation angle varied in accordance with variation of a synthesized magnetic field, and a compensating film of a garnet single crystal having a constant Faraday rotation angle. The base film has a wavelength coefficient sign and the compensating film has a wavelength coefficient sign which is different from that of the base film, so that a wavelength variation component of the Faraday rotation angle of the base film is reduced by the compensating film. For example, a fixed magnetic field parallel to a light direction is applied by permanent magnets 40, 42 and a variable magnetic field is applied by an electromagnet.