| 摘要 |
PURPOSE:To prevent incident light and emission light from deviating in axis and simplify optical system constitution by arranging the 1st and the 2nd prisms at both sides of a Faraday rotating element, and making the shape of its cross section trapezoid. CONSTITUTION:The 2nd prisms 3 are arranged upside down at both sides of the Faraday rotating element 1. When the vertical angle and refractive index of the prism are selected properly, light emitted by a light source 6, i.e. incident light 4 is made incident on the 1st prism 2 in the forward direction and deflected, and reflected rotally by a flank of the Faraday rotating element 1, so that the emission light 5 and incident light 4 do not deviate in axis in parallel and the emission light is in the same direction with the incident light 4. The incident light 4 made incident in the opposite direction, i.e. from the side of the 2nd prism 2 is zero-deflected by the 1st prism 2 when (e)-polarized to generate projected light 8 or (e)-polarized by the 1st prism 2 when zero-polarized to generate emission light 9. Namely, return light in the opposite direction is separated with high performance and never fed back to the light source 6. |
