Superpolished OAPs for WFIRST CGI

Mélanie Roulet; Emmanuel Hugot; Carolyn Atkins; Sabri Lemared; Simona Lombardo; Marc Ferrari

doi:10.1117/12.2312633

30 July 2018 Superpolished OAPs for WFIRST CGI

Mélanie Roulet, Emmanuel Hugot, Carolyn Atkins, Sabri Lemared, Simona Lombardo, Marc Ferrari

Proceedings Volume 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave; 106982Q (2018) https://doi.org/10.1117/12.2312633
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

Citation Download Citation

Mélanie Roulet, Emmanuel Hugot, Carolyn Atkins, Sabri Lemared, Simona Lombardo, and Marc Ferrari "Superpolished OAPs for WFIRST CGI", Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106982Q (30 July 2018); https://doi.org/10.1117/12.2312633

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