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      Superpolished OAPs for WFIRST CGI

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          Abstract

          Exoplanet imaging requires super polished off-axis parabolas (OAP) with the utmost surface quality. In this paper we describe an innovative manufacturing process combining 3D printing and stress polishing, to create a warping harness capable of producing any off axis parabola profile with a single actuator. The warping harness is manufactured by 3D printing. This method will be applied to the production of the WFIRST coronagraph's off axis parabolas. The evolution of the warping harness design is presented, starting from a ring warping harness generating astigmatism, to an innovative thickness distribution harness optimised to generate an off axis parabola shape. Several design options are available for the prototyping phase, with their advantages and disadvantages which will be discussed.

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          Journal
          02 November 2020
          Article
          10.1117/12.2312633
          2011.00893

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          Custom metadata
          Proceedings Volume 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave; 106982Q (2018)
          astro-ph.IM

          Instrumentation & Methods for astrophysics

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