Obtaining information through the atmosphere at the diffraction limit of a large aperture

Physics – Optics

Scientific paper

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Atmospheric Attenuation, Atmospheric Optics, Diffraction Propagation, Interferometry, Optical Data Processing, Apertures, Atmospheric Turbulence, Coherent Light, Photoelectric Effect, Pupils, Real Time Operation, Signal Detectors, Wave Diffraction

Scientific paper

An analysis is made which shows that if the pupil plane of a large telescope is relayed into a special achromatic prism interferometer of 180 deg rotational shear and with point symmetry, the second statistical moment of the pupil irradiance fluctuations reveals information about the source two-dimensional mutual coherence function (MCF) at spatial frequencies that, under ordinary conditions, are severely attenuated by propagation through the atmosphere. To obtain a measure of the MCF at points across the telescope pupil simultaneously, it is necessary to use a two-dimensional photo-electronic array detector, with real-time processing.

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