概要（Overview）

YieldStar 385H offers the latest in-resist post lithography overlay and focus metrology, with enhanced throughput and accuracy. Overlay, how well one layer is aligned to its previous layer, is becoming more important as structures get smaller and error tolerance reduces. Compared to previous systems, key enhancements include a faster stage and faster wavelength changing. This enables highly accurate overlay measurements and tool matching using multiple wavelengths without impacting throughput.