Open-loop control algorithms will soon become essential to run the Multi-Object Adaptive Optics (MOAO) systems that are planned for the next generation of giant telescopes. For the open-loop to perform at a very high level of precision, one will need to have an exact knowledge of the mirror behavior. Unlike the actual closed-loop adaptive optics (AO) systems, the non-linear effects will have to be taken into account. A study of these effects is therefore essential. We present the results of the characterization of 2 very different deformable mirrors (DM). The first is a magnetic mirror from ALPAO with 52 actuators positioned on an 8x8 grid. The second is a piezo-stack mirror with 57 actuators positioned on a 9x9 grid and designed by CILAS. The CILAS mirror is a prototype for the Narrow Field Infra-Red AO System (NFIRAOS), a first light AO instrument for the Thirty Meter Telescope (TMT). A simulation of these mirrors will follow soon.
© 2007 Optical Society of AmericaPDF Article
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