Complex spatial coherence function - Its measurement by means of a phase-modulated shearing interferometer

Physics – Optics

Scientific paper

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Imaging Techniques, Interferometers, Phase Modulation, Spatial Resolution, Stellar Atmospheres, Atmospheric Turbulence, Coherent Light, Diffraction Patterns, Fourier Transformation

Scientific paper

A stellar interferometer is proposed that has the following characteristics: parallel shear, phase modulation and detection, white light fringes, simplicity, and high mechanical stability. The interferometer developed is able to measure the complex coherence function of a star and distinguish it from most telescopic and atmospheric aberrations. This is achieved by detection of the fringes in the exit pupil, which is divided into small areas each less than a projected atmospheric isoplanatic patch. Then the phase-modulated fringes are detected independently in each area and summed incoherently. A description of a laboratory simulation is given.

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