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Light Detection Area The light detection area in P-series imagers is a linear array of contiguous pinned photodiodes on 14 Um centers. These photodiodes are constructed using PerkinElmer's advanced photo- diode design that extends short-wave- length sensitivity into the deep UV below 250 nm, while preserving 100% fill factor and delivering extremely low image lag. This unique design also avoids polysilicon layers in the light detection area that reduces the quantum efficiency of most CCD imagers. The P-series imagers are sup- plied with glass windows for general visible use, and fused silica windows for use in the ultraviolet below 350 nm. See Figure 2 for the sensitivity and window transmission curves.