The dispersion leverage coronagraph (DLC): an achromatic nulling coronagraph for use on primary objective grating telescopes

Leaf A. Swordy; Becket Hill; Heidi Jo Newberg

doi:10.1117/12.2678560

5 October 2023 The dispersion leverage coronagraph (DLC): an achromatic nulling coronagraph for use on primary objective grating telescopes

Leaf A. Swordy, Becket Hill, Heidi Jo Newberg

Author Affiliations +

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 126802L (2023) https://doi.org/10.1117/12.2678560
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Conference Poster

Abstract

We report on the Dispersion Leverage Coronagraph (DLC), a variation of the Achromatic Interfero Coronagraph (AIC) that is designed for optical systems featuring dispersive primary objectives that provide enhanced one-dimensional angular resolution. It was specifically designed for the Diffractive Interfero Coronagraph Exoplanet Resolver (DICER), a notional 20m class infrared space telescope utilizing the enhanced one-dimensional angular resolution of large diffraction gratings in order to discover and characterize near-Earth exoplanets. Here we develop the theoretical foundation for DLC, the interferometric system utilized by the DICER instrument for reduction of the exoplanet/host-star flux ratio. While the core method of operation of DLC remains very similar to AIC, the introduction of dispersive primaries alters the optical system in many nontrivial aspects. Here we derive important properties of the DLC system including focal plane transmission maps, stellar leakage, residual optical path difference tolerance, and pointing error/jitter considerations. Ultimately, we found that DLC effectively nulls a target spectrum across the entire focal plane, allows for 2D/λ diffraction limited imaging, and requires asymmetrical fine-guidance tolerances on pointing error/jitter.

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

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Leaf A. Swordy, Becket Hill, and Heidi Jo Newberg "The dispersion leverage coronagraph (DLC): an achromatic nulling coronagraph for use on primary objective grating telescopes", Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 126802L (5 October 2023); https://doi.org/10.1117/12.2678560

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