Extreme adaptive optics testbed: results and future work

Julia Wilhelmsen Evans, Gary Sommargren, Lisa Poyneer, Bruce A. Macintosh, Scott Severson, Daren Dillon, Andrew I. Sheinis, Dave Palmer, N. Jeremy Kasdin, Scot Olivier
2004 Advancements in Adaptive Optics  
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. A simple optical design allows us to minimize wavefront error and maximize the experimentally achievable contrast before progressing to a more complex set-up. A phase shifting diffraction
more » ... action interferometer is used to measure wavefront errors with sub-nm precision and accuracy. We have demonstrated RMS wavefront errors of <1.3 nm and a contrast of >10 -7 over a substantial region using a shaped pupil. Current work includes the installation and characterization of a 1024-actuator Micro-Electro-Mechanical-Systems (MEMS) deformable mirror, manufactured by Boston Micro-Machines, which will be used for wavefront control. In our initial experiments we can flatten the deformable mirror to 1.8-nm RMS wavefront error within a control radius of 5-13 cycles per aperture. Ultimately this testbed will be used to test all aspects of the system architecture for an extrasolar planet-finding AO system.
doi:10.1117/12.551762 fatcat:w4tbnnximjekzenxlzflanmuom