| 摘要 |
PURPOSE:To increase the isolation of the optical isolator by providing a polarization splitting mirror group as a polarizer on both sides of a Faraday rotation element. CONSTITUTION:Projection light from a laser diode 11 consists of, for example, vertical polarized light and is converted by a lens 12 into a parallel light beam, which is incident on the polarization splitting mirror group 13. Vertical polarized light projected from the polarization splitting mirror group is incident on the Faraday rotation element 14 to have its polarization direction turned by 45 deg., made incident on a polarization splitting mirror group 15, and converged on a point A through a lens 16. Light traveling from a point in the opposite direction passes through the lens 16 and polarization splitting mirror group 15 and projected having the direction rotated by 45 deg. through the Faraday rotation element 14; and the projection light is horizontally polarized light and perpendicular to the propagation direction of the polarization splitting mirror 13 and the light is all reflected in a direction Px. Therefore, there is no light returning to the laser light dd through the lens 12, and the function of the optical isolator is realized. |
