**Acknowledgements**

20 Adaptive Optics

pairs.

**5. Conclusion**

**Figure 11.** Vislization of the decentralized spatial structure of the feedback matrix *Kp* for selected co-located actuator/sensor

Control of deformable mirrors becomes relevant when the mirror dynamics are slower or equivalent with the dynamics of optical disturbances that shall be compensated by the deformable mirror. Active shape control of deformable mirrors can thereby increase the mirrors bandwidth and make it suitable for the AO task, again. When designing a model-based shape controller for a deformable mirror in a two-degree-of-freedom control The author would like to acknowledge the support by INAF and the Osservatorio Astrofisico di Arcetri in particular, providing finite element data of the LBT ASM and detailed insight into current deformable mirror control schemes. This work was supported by the DFG under grant SA-847/10-1 and OS-111/29-1 and by the Carl Zeiss AG.
