An adaptive optics (AO) system is most effective when there is a known alignment between the wave front
sensor (WFS) and the deformable mirror (DM). Misregistration is the term for the unknown alignment between
the WFS and DM. Misregistration degrades system performance and can make the system unstable. An AO
system uses a reconstruction matrix to transform WFS measurements into DM commands. A standard AO
system uses a model reconstruction matrix that assumes perfect registration between the WFS and DM. The
object of this research is to mitigate the negative effects of misregistration by using offline WFS measurements
to create the reconstruction matrix. To build the reconstruction matrix, each actuator on the DM is poked to
a fixed amount, and then the resulting measurement on the WFS is recorded. Analytic studies of the model
and measured matrices show that the measured matrix yields a more stable AO system. Additional simulations
indicate that applying the measured matrix improves the overall system performance compared to that of the
model reconstruction matrix.
This paper is the 3rd in a series of papers discussing characterization of a Micro-Electrical-Mechanical-System (MEMS)
deformable mirror in adaptive optics. Here we present a comparison between a conventional adaptive optics system
using a Xinetics continuous face sheet deformable mirror with that of segmented MEMS deformable mirror. We
intentionally designed the optical layout to mimic that of a conventional adaptive optics system. We present this initial
optical layout for the MEMS adaptive optics system and discuss problems incurred with implementing such a layout;
also presented is an enhanced optical layout that partially addresses these problems. Closed loop Strehl highlighting the
two systems will be shown for each case as well. Finally the performances of both conventional adaptive optics and the
MEMS adaptive optics system is presented for a range of adaptive optics parameters pertinent to astronomical adaptive
optics leading to a discussion of the possible implication of introducing a MEMS adaptive optics system into the science
community.
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