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Precision optical edges for a starshade external occulter

Show simple item record Steeves, John Martin, Stefan Webb, David Lisman, Douglas Shaklan, Stuart 2019-05-23T20:31:46Z 2019-05-23T20:31:46Z 2016-06-26
dc.identifier.citation SPIE Astronomical Telescopes + Instrumentation 2016, Edinburgh, Scotland, June 26 - July 1, 2016 en_US
dc.identifier.clearanceno 16-3177
dc.description.abstract The use of a starshade is one technique to perform high contrast imaging with space-based telescopes. The primary function of a starshade is to suppress light from a target star in order to image its orbiting planets. In order to provide the proper apodization function the edges of the starshade must follow a precise in-plane profile. However of equal importance is the issue of light from our own sun scattering off of the edges and entering the telescope. A method to alleviate this problem is to make the edges extremely sharp (< 1 µm terminal radius) such that the area available for scattering is minimized. The combination of these two requirements, along with the need to integrate the edges into a 30-40 m dia. deployable structure, present a number of significant engineering challenges. Substrate etching techniques are used to obtain both the intended profile as well as the edge sharpness. Current efforts implement an isotropic etching process on thin metal substrates. This paper discusses the progress towards producing a sharp optical edge at the coupon level. Samples have been characterized using scanning electron microscopy as well as a custom testbed to assess their scattered-light performance. 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, 2016 en_US
dc.subject starshade en_US
dc.subject occulter en_US
dc.subject high contrast imaging en_US
dc.title Precision optical edges for a starshade external occulter en_US
dc.type Preprint en_US

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