Title: The Johns Hopkinø Adaptive Optics Coronagraph
Abstract: The 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.
Publication Year: 1990
Publication Date: 1990-09-01
Language: en
Type: article
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