Laser source with coherent beam recombination

An optronic beam scanning system, comprising

• a laser source with coherent recombination of N spatial monomode laser beams, comprising N phase shifters controlled by a phase-lock device (3), characterized in that said phase-lock device comprising:
• an optical device (30) comprising means for taking at least a portion of each of said N beams, said optical device comprising an optical element (32) for applying a phase deformation, and at least one matrix (M1) of detectors for detecting a first image (im) of a wave surface corresponding to said N beams, and a second image (imd) deformed by said optical element (32);
• and
• processing means (31) for processing said first and second images, said processing means comprising means for measuring the phase pistons between the sub-pupils (spj) corresponding to said N beams and for applying phase corrections c(φ) to each of the N beams, by means of said N phase shifters so as to minimize said phase pistons, in order to deliver an optimized recombined laser beam as output;
• wherein said processing means are capable of impressing on the output beam a wave surface profile approximated by phase pistons juxtaposed with said phase corrections, wherein said profile is a phase ramp.

A free-space telecommunication system, comprising a laser source with coherent recombination of N spatial monomode laser beams, comprising N phase shifters controlled by a phase-lock device, said phase-lock device comprising:

• an optical device comprising means for taking at least a portion of each of said N beams, said optical device comprising an optical element for applying a phase deformation, and at least one matrix of detectors for detecting a first image of a wave surface corresponding to said N beams, and a second image deformed by said optical element;
• and
• processing means for processing said first and second images, said processing means comprising means for measuring the phase pistons between the sub-pupils corresponding to said N beams and for applying phase corrections to each of the N beams, by means of said N phase shifters so as to minimize said phase pistons, in order to deliver an optimized recombined laser beam as output;
• wherein said processing means are capable of impressing on the output beam (fR) a wave surface profile approximated by phase pistons juxtaposed with said phase corrections;
• wherein said profile is a phase function for precorrecting the known perturbations of the recombined beam.