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Influence of Partially Coherent Illumination on the Performance of Non-Airy Pupil Functions in Microscopic Systems

S. C. Som

Abstract

The influence of partially coherent illumination on the performance of a few non-Airy pupil functions (Sonine, phase-step, annular, Straubel, and Lansraux-Boivin pupil functions) is studied in the context of microscopic imagery. The imaging properties of these pupil functions are investigated in terms of the two-point image contrast and resolution. It is seen that by adjusting the state of coherence of illumination of the object structure and a suitable choice of the pupil function, a resolution higher than that due to the Airy pupil function may be obtained. It is also possible, in a similar way, to increase the image contrast without unduly reducing the image resolution.

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Key concepts: Pupil function, Pupil, Optics, Exit pupil, Context (archaeology), Point spread function, Coherence (philosophical gambling strategy), Contrast (vision)