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Updated: Aug 7, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
Published on: July 18, 2015
Reflectivity and optical surface height requirements in a broadband coronagraph. 1. Contrast floor due to
Stuart B Shaklan1, Joseph J Green
1Jet Propulsion Laboratory, California Institute of Technology, CA 91109, USA. stuart.shaklan@jpl.nasa.gov
Abstract:
We derive the broadband contrast floor in a coronagraphic telescope having nonideal optical surfaces. We consider only fundamental spatial frequencies within the control bandwidth of the coronagraph's deformable mirror. Cross terms arising from the beating of spatial frequencies beyond the deformable mirror control bandwidth will be considered in a second paper. Two wavefront control systems are analyzed:a zero-path difference Michelson interferometer with two deformable mirrors at a pupil image, and a sequential pair of deformable mirrors with one placed at a pupil image. We derive requirements on optical surface figure and reflectivity uniformity for both cases.
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