  A fraction of a laser beam array, whose unknown phase relationships must be
set to prescribed values, is launched into a scattering media with random
transmission. The resulting output speckle pattern is sampled by an array of
photodiodes measuring the local light intensity. The data feed an innovative
optimization process which controls a phase modulator array. Few iterations of
the opto-numeric loop lead to efficient and fast phase locking on any desired
wavefront.
