The optical system of the correction by the network is active for telescopic

摘要

Telescope 30 provided with a system for correcting its dynamic and static defects, comprising a primary mirror 31, a secondary mirror 32 coaxial with the said first primary mirror, and an optical system 35 at the exit of the secondary mirror; a deformable mirror 34, having a controlled deformation, located in the exit beam of the secondary mirror; a sensor 42 in the exit beam of the primary mirror and control means 43 controlled by the said sensor and controlling the deformation of the deformable mirror, characterised in that it furthermore comprises: - a light source 37 mounted on the telescope; - means 40 for superimposing the probe beam emitted by the source onto the exit beam of the telescope, which results in the probe beam emitted by the source propagating in the telescope, in the opposite direction to a beam coming from a point of sight of the telescope; and - a holographic grating 41 deposited on at least one part of the reflective surface of the primary mirror, making it possible to extract a small part of the probe wave, to diffract it and to focus it onto the sensor. IMAGE