Abstract
Scattering of coherent light from a disordered material produces a complex distribution of intensity known as a speckle pattern. Speckle patterns are not as random as they appear at first glance. Their statistical properties exhibit universal features, as already recognized in the first paper on laser speckle. The existence of short-range and long-range spatial correlations in speckles has been shown to be fundamental in wave physics. It has also led to the emergence of novel approaches for imaging through scattering media.
Highlights
A HISTORICAL PAPER ON LASER SPECKLE In 1963, shortly after the laser was invented, Robert Langmuir reported on a curious phenomenon in a Letter entitled Scattering of Laser Light [1]
Using an analogy with radar wave propagation, he borrows a known result in this domain to deduce that the probability distribution of the intensity I in the speckle pattern must be of the form exp(-I/I0)
Intuitively introduced by Langmuir in his paper, this result reveals the existence of fundamental statistical properties in speckle patterns
Summary
A HISTORICAL PAPER ON LASER SPECKLE In 1963, shortly after the laser was invented, Robert Langmuir reported on a curious phenomenon in a Letter entitled Scattering of Laser Light [1]. Using an analogy with radar wave propagation, he borrows a known result in this domain to deduce that the probability distribution of the intensity I in the speckle pattern must be of the form exp(-I/I0). In a speckle pattern, formed by shining monochromatic light on a scattering medium, the complex field amplitude E(r) is the superposition of partial waves emerging from all possible scattering paths inside the medium.
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