Proceedings PaperGeometrical Theory Of Diffraction And Telescope Stray-Light Analysis
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In today's telescopes, especially the infrared telescopes the importance of controlling diffraction effects impacts directly on the form of the optical design chosen for a given mission. It is of paramount importance that the designer understand the diffraction processes involved. It has been found that the geometrical theory of diffraction, developed over the last 20 years, provides a lucid picture of the diffraction processes and provides a convenient computational tool for evaluating them. The nature of the geometrical theory of diffraction is briefly reviewed. Application of the concepts to typical telescope diffraction problems is discussed. It is shown that the geometrical theory of diffraction provides a useful conceptual picture of the diffraction process especially multiple diffraction processes. The importance and sizes of telescope stops required to minimize diffraction effects in telescopes are discussed.