| 摘要 |
A reflection type magneto-optic sensor includes a light path assembly, a lens, a polarizer, a bismuth-substituted rare earth iron garnet single crystal film (BIG film), a non-magnetic garnet substrate, and a mirror, all being aligned in this order along the optical axis of the lens. The light path assembly has a light-inputting path and a light-outputting path parallel to each other. The lens has a focal point, the optical axis parallel to the light-inputting path and the light-outputting path, and first and second surfaces normal to the optical axis. The light-inputting path and the light outputting path are disposed in proximity to the focal point of the lens so that light exiting the light inputting path enters the lens and is then reflected back by the mirror into the light-outputting path. The BIG film is grown on the non-magnetic garnet substrate by a liquid epitaxial method and the polarizer is bonded on the BIG film, so that the BIG film is held between the polarizer and the non-magnetic garnet substrate in a sandwiched relation. The polarizer and the non-magnetic garnet substrate lapped to taper in opposite directions at an angle in the range from 3 to 20 DEG so that the BIG film is at an angle with the optical axis of the lens when the substrate-BIG-polarizer assembly is placed with the lapped surfaces normal to the optical axis of the lens.
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