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Image degradation due to atmospheric turbulence is extremely severe in the visible. For instance, it reduces the angular resolution of a 4m telescope by a factor of the order of 30. The reconstruction of a diffraction-limited image is a difficult task. It is usually attempted from records of turbulence degraded images. The most successful methods are based on speckle interferometry (Labeyrie 1970) and related algorithms.
© 1983 Optical Society of America
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