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Future Extremely Large Telescopes will adopt segmented primary mirrors withseveral hundreds of segments. Cophasing of the segments together is essentialto reach high wavefront quality. The phasing sensor must be able to maintainvery high phasing accuracy during the observations, while being able to phasesegments dephased by several micrometers. The Zernike phase contrast sensor hasbeen demonstrated on-sky at the Very Large Telescope. We present themulti-wavelength scheme that has been implemented to extend the capture rangefrom \pmlambda/2 on the wavefront to many micrometers, demonstrating that it issuccessful at phasing mirrors with piston errors up to \pm4.0 micron on thewavefront. We discuss the results at different levels and conclude with aphasing strategy for a future Extremely Large Telescope.

On-sky multi-wavelength phasing of segmented telescopes with the Zernike phase contrast sensor