OPTICAL CALIBRATION AND TEST OF THE VLT DEFORMABLE SECONDARY MIRROR

modules of the new Adaptive Optics Facility (AOF) of ESO. The Deformable Secondary Mirror (DSM) for the VLT (ESO) represents the state-of-art of the large-format deformable mirror technology. The paper reports the results of the optical characterization of the mirror unit with the ASSIST facility located at ESO-Garching and executed in a collaborative effort by ESO, INAF-Osservatorio Astrofisico di Arcetri and the DSM manufacturing companies (Microgate s.r.l. and A.D.S. International s.r.l.).