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ExoPlanet Optics: conceptual design processes for stealth telescopes

Breckinridge, J. B. and Harvey, J. E. and Irvin, R. and Chipman, R. and Kupinski, M. and Davis, J. and Kim, D. W. and Ewan, D. and Lillie, C. F. and Hull, T. (2019) ExoPlanet Optics: conceptual design processes for stealth telescopes. In: UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts IX. Proceedings of SPIE. No.11115. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 111150H. ISBN 9781510629233.

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In this paper we examine several contrast-degrading static signature sources present in current terrestrial exoplanet Lyot Coronagraph/Telescope optical systems. These are: - Unnecessary optical surfaces, which increase cost, absorption, scatter, wavefront control and alignment issues. A suggested solution is to make every effort to investigate innovative solutions to reduce the number of optical surfaces during the early design phase. Consider free-form optics. - Diffraction from secondary support systems and classical hexagon segmented apertures, which masks the low IWA terrestrial exoplanets. A suggested mitigation is to investigate curved secondary support systems and a pinwheel architecture for the deployable primary aperture. - Polarization Fresnel and form birefringence aberrations, which distort the system PSF, introduce absorption, scatter and wavefront control issues. Mitigation is to reduce all ray-angles of incidence to a minimum, investigate zero-loss polarization compensation wavefront technology, and investigate metal thin film deposition processes required to minimize form birefringence in large-area high-reflectivity coatings. - Small-angle specular or resolved angle scattered light, which places a narrow halo of incoherent light around the base of the PSF. There is no requirement on mirror smooth-surface scatter. Investigate the physical source of the small angle scatter and develop mirror polishing and thin film deposition processes to minimize scatter.

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Breckinridge, J. B.0000-0002-9488-098X
Alternate Title:Stealth telescopes for space and ground astronomy
Additional Information:© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE). This work was funded in part by NASA research grant NNX17AB29G to James Breckinridge, PI, at the James C. Wyant College of Optical Sciences, University of Arizona, Tucson AZ. Additional support provided by: Caltech, and Photon Engineering, Tucson, AZ.
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Subject Keywords:Terrestrial exoplanet imaging, HabEx, LUVOIR, space telescopes, coronagraphs, optical design, polarization, diffraction, mirror surface scatter
Series Name:Proceedings of SPIE
Issue or Number:11115
Record Number:CaltechAUTHORS:20190913-081328146
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Official Citation:J. B. Breckinridge, J. E. Harvey, R. Irvin, R. Chipman, M. Kupinski, J. Davis, D-W. Kim, E. Douglas, C. F. Lillie, and T. Hull "ExoPlanet Optics: conceptual design processes for stealth telescopes", Proc. SPIE 11115, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts IX, 111150H (9 September 2019);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98631
Deposited By: Tony Diaz
Deposited On:13 Sep 2019 16:28
Last Modified:16 Nov 2021 17:40

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