Johns Hopkins adaptive optics coronagraph

摘要

Abstract: This Johns Hopkins University is developing a stellar coronagraph which will use adaptive optics to achieve nearly diffraction-limited imaging at optical wavelengths with 1 - 2 meter class telescopes. The first phase of development, the incorporation of an image motion compensation system into the coronagraph, is complete. Performance tests have resulted in a factor of 2 gain in image resolution, corresponding to the maximum gain predicted by theory. The next phase of development involves the construction of an electrostatically deformable membrane mirror and a wavefront curvature sensor for the removal of higher order aberrations. A membrane mirror with 91 actuators has been built for laboratory testing. Integration of the adaptive mirrors, high speed wavefront sensor, and control processor is forthcoming.!