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Segmented primary mirrors are indispensable to master the steady increase inspatial resolution. Phasing optics systems must reduce segment misalignments toguarantee the high optical quality required for astronomical science programs.Modern telescopes routinely use adaptive optics systems to compensate for theatmosphere and use laser-guide-stars to create artificial stars as brightreferences in the field of observation. Because multiple laser-guide-staradaptive optics are being implemented in all major observatories, we propose touse man-made stars not only for adaptive optics, but for phasing optics. Wepropose a method called the doublet-wavelength coherence technique (DWCT),exploiting the D lines of sodium in the mesosphere using laser guide-stars. Thesignal coherence properties are then used. The DWCT capture range exceedscurrent abilities by a factor of 100. It represents a change in paradigm byimproving the phasing optics capture range from micrometric to millimetric. Itthereby potentially eliminates the need of a man-made mechanical pre-phasingstep. Extremely large telescopes require hundreds of segments, several of whichneed to be substituted on a daily basis to be recoated. The DWCT relaxesmechanical integration requirements and speeds up integration andre-integration process.

Laser-guide-stars used for cophasing broad capture ranges