TY - JOUR
AU1 - Evans, Julia W.
AU2 - Morzinski, Katie
AU3 - Poyneer, Lisa
AU4 - Macintosh, Bruce A.
AU5 - Dillon, Daren
AU6 - Sommargren, Gary
AU7 - Palmer, David
AU8 - Gavel, Don
AU9 - Olivier, Scot
AB - "Extreme" adaptive optics systems are optimized for ultra-high contrast applications, such as ground-based extrasolar planet detection. The Extreme Adaptive Optics Testbed at UC Santa Cruz is being used to investigate and develop technologies for high-contrast imaging, especially wavefront control. We use a simple optical design to minimize wavefront error and maximize the experimentally achievable contrast. A phase shifting diffraction interferometer (PSDI) measures wavefront errors with sub-nm precision and accuracy for metrology and wavefront control. Previously, we have demonstrated RMS wavefront errors of <1.5 nm and a contrast of >10 7 over a substantial region using a shaped pupil without a deformable mirror. Current work includes the installation and characterization of a 1024-actuator Micro-Electro-Mechanical-Systems (MEMS) deformable mirror, manufactured by Boston Micro-Machines for active wavefront control. Using the PSDI as the wavefront sensor we have flattened the deformable mirror to <1 nm within the controllable spatial frequencies and measured a contrast in the far field of >10 6 . Consistent flattening required testing and characterization of the individual actuator response, including the effects of dead and low-response actuators. Stability and repeatability of the MEMS devices was also tested. Ultimately this testbed will be used to test all aspects of the system architecture for an extrasolar planet-finding AO system.
TI - Extreme adaptive optics testbed: high contrast measurements with a MEMS deformable mirror
JF - Proceedings of SPIE
DO - 10.1117/12.619140
DA - 2005-08-18
UR - https://www.deepdyve.com/lp/spie/extreme-adaptive-optics-testbed-high-contrast-measurements-with-a-mems-T1y5rGHZsh
SP - 59050Y
EP - 59050Y-8
VL - 5905
IS - 1
DP - DeepDyve
ER -