Assessment of near-angle scatter on exo-Earth coronagraphy

H. Philip Stahl

doi:10.1117/12.2676543

4 October 2023 Assessment of near-angle scatter on exo-Earth coronagraphy

H. Philip Stahl

Proceedings Volume 12676, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts XI; 1267608 (2023) https://doi.org/10.1117/12.2676543
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

A first order single surface analysis indicates that, to enable coronagraphic detection and characterization of exo-Earth planets, near angle scatter must be considered when specifying optical surfaces for a potential Habitable World Observatory. Based on arbitrary error budget allocations and using Rayleigh-Rice Vector Scatter Theory, Generalized Harvey-Shack Scalar Scatter Theory, and Greynolds Approximation, ‘placeholder’ specifications for the primary mirror are derived: Static Surface Roughness < 1 nm rms, and Dynamic Surface Roughness < 1 pm PV. These specifications will change once error budget allocations are defined. Analysis does not include scatter from more than just the primary mirror, coating structure, edges, contamination, micrometeoroid impacts, etc.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

H. Philip Stahl "Assessment of near-angle scatter on exo-Earth coronagraphy", Proc. SPIE 12676, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts XI, 1267608 (4 October 2023); https://doi.org/10.1117/12.2676543

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