Following the successful astronomical runs of the Come-On adaptive optics prototype on the ESO 3.6 m telescope in La Silla, Chile an upgraded version called Come-On-Plus is currently being constructed and was set up in December 1992. This paper describes the main improvements of this new system. In particular, the 52 actuator deformable mirror with 30 Hz closed loop bandwidth, the modal control, the high detectivity wavefront sensor channel, and the infrared imaging channel are presented. Finally, the laboratory tests of each subsystem are analyzed. This second prototype is dedicated to routine astronomical observing as well as providing design parameters for the adaptive optics for the ESO Very Large Telescope (VLT).
"New adaptive optics prototype system for the ESO 3.6-m telescope: Come-on-Plus", Proc. SPIE 1780, Lens and Optical Systems Design, 178025 (15 April 1993); doi: 10.1117/12.142876; https://doi.org/10.1117/12.142876