We are developing an objective system for a catadioptric setup used in semiconductor defect inspection at 193nm in deep UV band. This system comprises seven lenses and two mirrors with a numerical aperture of 0.8 and a total length of 95mm. Upon analyzing the optical performance of the system, we identified two lenses as the most sensitive components. These lenses will serve as compensators during the assembly and alignment process using an interferometer. In this paper, we present the testing plan for the catadioptric system and discuss the assembly process.
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