Designing and characterizing UV gratings for exoplanet habitability studies

Jared A. B. Termini; Keri Hoadley; Casey DeRoo; Cecilia Fasano

doi:10.1117/12.2676387

5 October 2023 Designing and characterizing UV gratings for exoplanet habitability studies

Jared A. B. Termini, Keri Hoadley, Casey DeRoo, Cecilia Fasano

Proceedings Volume 12678, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXIII; 1267818 (2023) https://doi.org/10.1117/12.2676387
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Ultraviolet (UV, 900−2000 Å) astrophysics plays a vital role in studying exoplanets and evaluating their potential habitability. One approach to understanding exoplanetary habitability is through the study of their absorption spectra, which can reveal not only the chemical composition and physical properties (e.g., mass-loss rate) of their atmosphere but also the UV environment around the host star. Using grating simulation software, we explored a grating-parameter space (blaze angle, grating period) to optimize the design parameters of a UV grating designed for observing key spectral features (e.g., H i, O i, C ii, etc.) in exoplanetary atmospheres. We use interferometric measurements to determine the grating’s groove placement accuracy, groove uniformity, and limiting resolution; and other metrology techniques to characterize the surface roughness. We quantify the expected performance of our UV gratings using these measurements. This work is part of an effort to leverage trends found between measured UV grating performance and the grating’s intrinsic, fabricated characteristics to estimate the expected performance of UV gratings as we fabricate larger gratings.

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

Citation Download Citation

Jared A. B. Termini, Keri Hoadley, Casey DeRoo, and Cecilia Fasano "Designing and characterizing UV gratings for exoplanet habitability studies", Proc. SPIE 12678, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXIII, 1267818 (5 October 2023); https://doi.org/10.1117/12.2676387

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KEYWORDS

Blazed gratings

Ultraviolet radiation

Diffraction gratings

Surface roughness

Diffraction

Optical gratings

Spectral resolution

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