Laser beam expansion without unchanged spatial coherence

A system (100), comprising: a mirror (200); and first (204) and second (206) spatially separated beam splitters positioned on a same side of and parallel to the mirror to expand light (102) emitted by a laser source into a plurality of beams (220,222,224) having light intensity substantially equal to each other without changing a spatial coherence of the light emitted by the laser, wherein a plane of the first beam splitter is located parallel to and a distance d from a plane extending from a reflecting surface of the mirror, wherein d = a/(2*sin ±), a is a width of the light emitted by the laser source, and ± is an illumination angle of the light with respect to the first beam splitter, wherein a plane of the second beam splitter is located parallel to and a distance 2d apart from the plane of the mirror, wherein an edge of the first beam splitter is laterally shifted a distance b with to respect to a section of the mirror, wherein b = d*tan ±, and wherein an edge of the second beam splitter is laterally shifted a distance 2b with respect to the section of the mirror.