JPL Technical Report Server

Development of Low-Scatter Optical Edges for Starshades

Show simple item record Steeves, John Lee, Hyeong Jae Hilgemann, Evan Webb, David Shaklan, Stuart Martin, Stefan Lisman, Douglas McKeithen, Dylan Bradley, Christine 2020-05-12T17:18:15Z 2020-05-12T17:18:15Z 2018-06-12
dc.identifier.citation SPIE Astronomical Telescopes + Instrumentation, Austin, Texas, June 12 - 14, 2018 en_US
dc.identifier.clearanceno 18-2922
dc.description.abstract Starshades, combined with future space telescopes, provide the ability to detect Earth-like exoplanets in the habitable zone by producing high contrast ratios at small inner working angles. The primary function of a starshade is to suppress light from a target star such that its orbiting planets are revealed. In order to do so, the optical edges of the starshade must maintain their precise in-plane profile to produce the necessary apodization function. However, an equally important consideration is the interaction of these edges with light emanating from our own Sun as scattered and/or diffracted sunlight can significantly degrade the achievable contrast. This paper describes the technical efforts performed to obtain precision, low-scatter optical edges for future starshades. Trades between edge radius (i.e. sharpness) and surface reflectivity have been made and small-scale coupons have been produced using scalable manufacturing processes. A custom scattered light testbed has been developed to quantify the magnitude of scattered light over all sun angles. Models have also been developed to make predictions on the level of reflected and/or diffracted light for various edge architectures. The results of these studies have established a current baseline approach which implements photochemical etching techniques on thin metal foils. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA: Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2018 en_US
dc.subject starshades en_US
dc.subject optical edges en_US
dc.subject scatter en_US
dc.subject diffraction en_US
dc.subject high contrast imaging en_US
dc.title Development of Low-Scatter Optical Edges for Starshades en_US
dc.type Preprint en_US

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