| 摘要 |
The invention concerns a projection objective for a projection exposure apparatus, said projection exposure apparatus having a primary light source for emitting electromagnetic radiation with a wavelength <= 193 nm. The projection objective comprises an object plane (2), a first mirror (51), a second mirror (52), a third mirror (53), a fourth mirror (54), and an image plane (4). The object plane, the first mirror, the second mirror, the third mirror, the fourth mirror, and the image plane are arranged in a centred arrangement around a common optical axis (PA). The first, second, third and fourth mirror are situated between the object plane and the image plane. A chief ray of said electromagnetic radiation incident on an object situated in the object plane is inclined away from the optical axis in a direction from the primary light source toward the image in the image plane.
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