Abstract
We present experimental measurements of the statistics of intensity scintillations in light scattered by a random phase screen. The phase screen was produced in the laboratory by turbulent mixing of hot and cold air; the parameters of this screen were such that geometrical focussing effects could be studied near the screen and speckle effects were clearly visible in the far field. Results are given for the propagation of both laser light and white light through the turbulent region. We compare experimental results with the theory for a phase screen with a gaussian phase correlation function. New theoretical work which allows comparison for mean-square phase fluctuation φ 2 å 1 is also outlined.
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