Coherent image synthesis from wave-front sensor measurements of a nonimaged laser speckle field: a laboratory demonstrations.

We report what are to our knowledge the first coherent images recovered in the laboratory from measurements made with a Shack-Hartmann wave-front sensor of the phase and amplitude of a laser speckle wave front. We discuss the design of our wave-front sensor, which can obtain the phase and amplitude of an optical field with a single intensity measurement, and we point out a particular type of phase jump that cannot be detected by the Shack-Hartmann sensor. We also discuss implementations of this technique that may permit near-diffraction-limited imaging through turbulent media.

First astronomical application of postdetection turbulence compensation: images of alpha Aurigae, nu Ursae Majoris, and alpha Geminorum using self-referenced speckle holography.

We describe a postdetection turbulence compensation technique for obtaining high resolution imagery through the atmosphere. We present preliminary results fromfield experiments.