Mirror surface contamination specification derived from coronagraphy scatter error budget allocation

H. Philip Stahl; David D. Smith; Bijan Nemati

doi:10.1117/12.3028546

1 October 2024 Mirror surface contamination specification derived from coronagraphy scatter error budget allocation

H. Philip Stahl, David D. Smith, Bijan Nemati

Author Affiliations +

Proceedings Volume 13129, Optical Modeling and Performance Predictions XIV; 1312906 (2024) https://doi.org/10.1117/12.3028546
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

Near-Angle Scatter (NAS) of the host star’s light may limit the ability of a potential Habitable Worlds Observatory (HWO) to detect and characterize an Earth-like planet around a Sun-like star via coronagraphy. NAS from each optical surface before the coronagraph’s focal plane mask produces an E-field across the dark hole that is coherent. These E-fields sum and could be as large or larger than the coronagraph mask leakage E-field. This paper assumes an error budget allocation for scatter of 20 ppt. NAS E-fields contribute to the dark hole noise floor via both shot noise and heterodyne amplification of the wavefront instability. While previous papers have developed specifications for scatter from surface scatter, this paper develops specifications for scatter from surface contamination and micrometeoroid impacts. The development process utilizes an expression that predicts scatter throughput into the dark hole based on surface BRDF. Analysis does not include scatter from coating columnar structure, edges, contamination, micrometeoroid impacts, or polarization.

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Citation Download Citation

H. Philip Stahl, David D. Smith, and Bijan Nemati "Mirror surface contamination specification derived from coronagraphy scatter error budget allocation", Proc. SPIE 13129, Optical Modeling and Performance Predictions XIV, 1312906 (1 October 2024); https://doi.org/10.1117/12.3028546

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