Diffraction effects from giant segmented-mirror telescopes.
Ultrahigh contrast imaging with giant segmented-mirror telescopes will involve light levels of order 10(-6) times that of the central diffraction spike or less. At these levels it is important to quantify accurately various diffraction effects, including segmentation geometry, intersegment gaps, obscuration by the secondary mirror and its supports, and segment alignment and figure errors. We describe an accurate method for performing such calculations and present preliminary results in the context of the California Extremely Large Telescope.
Troy
Mitchell
M
Jet Propulsion Laboratory, California Institute of Technology, M/S 306-388, 4800 Oak Grove Drive, Pasadena, California 91109, USA. mtroy@jpl.nasa.gov
Chanan
Gary
G