Abstract
The interferometric mode of the ESO Very Large Telescope (VLT) permits coherent combination of stellar light beams collected by four Unit Telescopes (UTs) with 8m diameter and by several Auxiliary Telescopes (ATs) of the 2m class. While the position of the UTs is fixed, ATs can be moved on rails and can operate from 30 stations distributed on the top of the observatory site for efficient UV coverage. Coherent beam combination can be achieved with the UTs alone, with the ATs alone, or with any combination of up to eight telescopes. A distinct feature of the interferometric mode is the high sensitivity due to the 8m pupil of the UTs with the potential for adaptive optics compensation in the near-infrared spectral regime.
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