| 摘要 |
PURPOSE:To efficiently obtain linearly polarized light by disposing a prism reflecting surface in such a manner that the arranging direction of the reflecting surfaces attains 45 deg. angle with the plane of polarization of incident light. CONSTITUTION:This device has the 1st prism 2 which branches the light from a light source 5 in two direction, a polarization beam splitter 3 which reflects one of the (p) polarization component light and (s) polarization component light and allows the transmission of the other of each of the two branched light beams, the prism reflecting surfaces 4 which are made incident with the reflected light from this splitter and yields the reflected light component rotated in plane of polarization by 90 deg., and the 2nd prism 1 for unifying the progressing directions of the light reflected by this reflecting surfaces 4 and transmitted through the splitter 3 and the light transmitted directly through the splitter 3 of the branched light beams from the 1st prism 2. The reflecting surfaces 4 have the many reflecting mirror surfaces 12a, 12b, the adjacent surfaces of which intersect orthogonally with each other. The many reflecting surfaces are arranged in the direction orthogonal with the ridge lines formed by the adjacent reflecting mirror surfaces 12a, 12b. The reflecting surfaces 4 are disposed in the positions where the arranging direction of the reflecting mirror surfaces 12a, 12b has 45 deg. angle with the plane of polarization of the incident light. |
