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16 July 2008 Deformable mirror controller for open-loop adaptive optics
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A Deformable Mirror Controller (DMC) has been devised to overcome the open-loop nature of Multi Object Adaptive Optics (MOAO), in particular for AO systems with update rates of 1 ms or less. The system is based on a figure sensor, which uses a monochromatic illumination source and a Shack-Hartmann (SH) wavefront sensor (WFS) to obtain a fine sampling of DM's 3D surface. The sensor's beam is optically separated from the science path in order to not interfere with science observations. The DMC incorporates a real-time controller in charge of driving the DM. This controller runs in a dedicated Field-Programmable-Gate-Array (FPGA) based processor to keep up with stringent speed requirements. The DMC is being tested in the laboratory and is part of CANARY, an MOAO on-sky demonstrator to be installed at the William Hershel Telescope.
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Dani Guzmán, Andrés Guesalaga, Richard Myers, Ray Sharples, Tim Morris, Alastair Basden, Christopher Saunter, Nigel Dipper, Laura Young, Luis Rodríguez, Marcos Reyes, and Yolanda Martin "Deformable mirror controller for open-loop adaptive optics", Proc. SPIE 7015, Adaptive Optics Systems, 70153X (16 July 2008);

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