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The near-infrared adaptive optics system

GRAVITY's wavefront sensor and adaptive optics system

The wavefront sensor of GRAVITY will be of Shack-Hartmann-type using a lenslet mask with 9x9 micro-lenses. A recent description of the wavefront sensor and the complete adaptive optics system can be found here.

The wavefront sensor will be sensitive in the spectral range between 1.4 and 2.4 microns. The reasons for this choice are described here.

The AO system of GRAVITY uses the existing MACAO deformable mirrors installed at the VLTI.

The real-time computers will be based on the SPART-light platform designed by ESO.

Dedicated interferometric algorithms will be used to avoid unwanted disturbances. This includes deformable mirror saturation management, anti-windup, and piston control. Vibration tracking will be imlemented as well.

GRAVITY Consortium