Abstract
A prevailing strategy in imaging through random media is separating the unscattered (ballistic) signal from scattered illumination. This has been achieved with a variety of techniques, including time-resolved detection [1], spatial coherence holography [2], and temporal coherence holography [3]. These all require access to the illumination source, either through control of its spatio-temporal behavior or acquisition of a reference pulse. In many applications, e.g., astronomy, space-based imaging, and remote targeting, the illumination source is inaccessible and these methods are therefore inapplicable. In such cases, which often involve turbulent media (e.g., the atmosphere), existing imaging methods such as shift-and-add or speckle interferometry [5] must operate with short exposure times and invoke strong assumptions on the propagation medium, e.g., isoplanacity [4]. We introduce here a novel technique for imaging through random and turbulent media which utilizes ballistic photon detection and does not require source manipulation of any kind.
© 1996 Optical Society of America
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