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Source publication
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 intentional...
Context in source publication
Context 1
... type of reconstructor used depends upon the type of DM being used, for example a continuous face sheet DM responds in a small zone around the actuators whereas a piston or tilt only DM respond to modal commands (6) . Figure 3 shows a block diagram indicating where the reconstructor fits into the AO system's control architecture. The definition of the reconstructor, E, is the pseudo-inverse of the influence function matrix, G (7) . ...
Citations
Micro-Electro-Machined Systems (MEMS) have been increasingly used as mirrors in place of conventional continuous face sheet deformable mirrors (DM) in adaptive optics (AO) systems. Here we study the diffraction effects introduced into the optical path when a segmented MEMS DM is used to correct for the wavefront aberrations. Diffraction effects are monitored through the intermediate focus plane prior to the wavefront sensor. Low pass spatial filter is used at the plane in order to investigate how the making of various diffraction orders affects the phase. Measured phase and focal image plane data for various turbulence conditions are presented and analyzed.
The ASALT lab has been investigating the use of a segmented MEMS DM in adaptive optics systems. One of the anticipated benefits of a segmented device is that in monochromatic light the throw is essentially infinite due to the modulo 2Pi nature of the device. Earlier work demonstrated how this modulo 2Pi behavior interacts unexpectedly with a standard proportional integral controller. Here we present experimental data on this effect to include the testbed on which the data was taken and the methodology used to measure the effect.
