| 摘要 |
A polarization-dependent optical component is arranged in the beam path of a projection lens, for splitting the projection beam into two orthogonally polarized sub-beams (66,68) whose wavefronts (166,168) spread over an angle delta which is approximately equal to zero. A polarizing prism (60) is arranged behind the component for combining the two sub-beams into an output light beam (70) with parallel wavefronts (170,170').
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