| 摘要 |
PCT No. PCT/DE92/00623 Sec. 371 Date Apr. 28, 1993 Sec. 102(e) Date Apr. 28, 1993 PCT Filed Jul. 30, 1992 PCT Pub. No. WO93/05426 PCT Pub. Date Mar. 18, 1993.A device is provided for division of a light beam into two sub-beams. A polarization beam splitter is provided having a polarizing layer which, dependent upon polarization direction, resolves an incident polarized light beam into a beam component reflected by the polarizing layer as a first sub-beam, and into a beam component transmitted in a direction of an axis of the light beam. The polarization beam splitter is followed along the beam axis by a phase transformer and by a mirror. The phase transformer undertakes a transformation of a linear polarization into circular polarization upon passage of the transmitted beam component therethrough. The resulting circularly polarized beam component is then reflected at the mirror. The phase transformer then produces phase rotation of the polarization by 90 DEG upon passage of the beam component reflected by the mirror. The beam component, which is again incident onto the polarization beam splitter is totally reflected at the polarizing layer to become a second sub-beam.
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