Ground-based interferometry with the European Very Large Telescope (VLT)

Physics – Optics

Scientific paper

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Interferometry, Linear Arrays, Space Observations (From Earth), Telescopes, Adaptive Optics, Phased Arrays, Synthetic Apertures

Scientific paper

The linear array concept of the European Southern Observatory Very Large Telescope (VLT) is described. Four independent telescopes of the 8 m class are coupled together. This offers the possibility to operate the telescopes as a long baseline interferometer in the IR and visible wavelengths with a 104-m baseline. First target for the interferometric operation is the IR range and later a gradual expansion towards shorter wavelengths. Two smaller movable telescopes are added to the linear array for spatial frequency filling reasons. Adaptive optics will be applied for a real-time partial of full phase compensation of atmospheric distortions. Additional to phasing of the individual pupils of independently mounted telescopes, the whole array has to be phased, including pupil position corrections due to pupil foreshortening and shift effects. Technical requirements for phasing the synthetic aperture of the VLT interferometer are analogous to space based systems.

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