Characterizing fabrication quality and UV performance of UV gratings

Jared A. B. Termini; Keri Hoadley; Casey DeRoo; Cecilia Fasano; Paul Scowen; Manuel Quijada; Mateo Batkis; Javier Del Hoyo; Luis Rodriguez-de-Marcos; Erika Hamden; Jessica Li

doi:10.1117/12.3016276

21 August 2024 Characterizing fabrication quality and UV performance of UV gratings

Jared A. B. Termini, Keri Hoadley, Casey DeRoo, Cecilia Fasano, Paul Scowen, Manuel Quijada, Mateo Batkis, Javier Del Hoyo, Luis Rodriguez-de-Marcos, Erika Hamden, Jessica Li

Author Affiliations +

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 1309342 (2024) https://doi.org/10.1117/12.3016276
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Ultraviolet (UV, 900−2000 Å) spectroscopy plays a vital role in studying exoplanets. Future UV spectrographs will require large-format, high-performance gratings (R > 10⁴). Unfortunately, measuring the UV performance of a large-format grating from 900−2000˚ Å is resource-intensive and requires large special vacuum facilities, hampering UV grating development. An efficient characterization process will save time and reduce costs, facilitating the development of blazed UV gratings for next-gen UV space telescopes. This work is part of an effort to determine if we can leverage trends found between measured UV grating performance (on small stamp-size gratings) and the grating’s intrinsic, fabricated characteristics to estimate the expected performance of large-format UV gratings. Here, we present a pilot study using an 855nm period grating. We characterize the grating’s fabrication quality via interferometry and single-point metrology. Finally, we describe measurements of the grating’s diffraction efficiency that will be conducted later this year.

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Jared A. B. Termini, Keri Hoadley, Casey DeRoo, Cecilia Fasano, Paul Scowen, Manuel Quijada, Mateo Batkis, Javier Del Hoyo, Luis Rodriguez-de-Marcos, Erika Hamden, and Jessica Li "Characterizing fabrication quality and UV performance of UV gratings", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 1309342 (21 August 2024); https://doi.org/10.1117/12.3016276

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