| 摘要 |
PCT No. PCT/DE92/00624 Sec. 371 Date Jul. 16, 1993 Sec. 102(e) Date Jul. 16, 1993 PCT Filed Jul. 30, 1992 PCT Pub. No. WO93/05427 PCT Pub. Date Mar. 18, 1993.An optical beam-dividing device divides an optical beam into first and second sub-beams. A first prism has an entry face for an optical beam incident thereon. A first exit face is provided at which the first sub-beam exits. A second prism is provided adjoining the first prism at a first optical beam splitter. The second prism has a second exit face at which the second sub-beam exits. A third prism adjoins the second prism at a second optical beam splitter. The third prism has a reflection face opposite the second splitter. The second exit face has a third optical beam splitter thereat. The reflection face has a mirror aligned substantially perpendicular relative to the optical axis and has a circular-to-linear optical beam converter thereat. The various parts of the device are geometrically positioned relative to one another so that the optical beam entering the entry face is split into the first and second sub-beams for exiting from opposite sides of the device and so that each sub-beam undergoes an even number of reflections.
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