Denoting an optical system which involves both the reflecting and refracting of light, in order to reduce aberration.
- Despite some improvements in narrowing the laser bandwidth, the lack of a glass material in addition to CaF 2 to compensate for chromatic aberrations makes a catadioptric design the only possible choice for the projection optics.
- More recently, it often shows up in fairly complex catadioptric systems as a simple, inexpensive substitute for an aspheric mirror.
- One alternative for 126 nm is to eliminate refractive or catadioptric designs and instead use an all-reflective approach.
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