Curved diffractive optics for high energy spectroscopy: current status and challenges

Casey T. DeRoo; Fabien Grisé; Randall L. McEntaffer; James H. Tutt; Cecilia R. Fasano

doi:10.1117/12.3020294

22 August 2024 Curved diffractive optics for high energy spectroscopy: current status and challenges

Casey T. DeRoo, Fabien Grisé, Randall L. McEntaffer, James H. Tutt, Cecilia R. Fasano

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 1309312 (2024) https://doi.org/10.1117/12.3020294
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

Improved X-ray/UV spectroscopy is needed for studies of exoplanet host systems, the evolution of galaxies, and the physics of extreme astrophysical conditions. Efficient, high-resolution X-ray / UV spectrometers would meet this need, but realizing such instruments, particularly in compact formats like SmallSats, are often gated by the fabrication of a grating that meets the size, shape, diffractive design, and performance requirements of the spectrometer. We report on an effort to make custom, high performance gratings on curved surfaces using electron-beam lithography (EBL). We have made modestly-sized gratings (39 mm X 20 mm) on cylindrical surfaces with sag comparable to that of a grazing-incidence optic (> 1 mm). Our approach uses interferometric measurements of diffracted orders to assess the fidelity of EBL in realizing the desired grating, providing a direct measurement of the technology’s current capabilities and informing development efforts. We also report on the fabrication and testing of a diffractive silicon mirror operating at grazing incidence, as well as an optical design for a test of a novel, two-element spectrometer system.

Conference Presentation

Citation Download Citation

Casey T. DeRoo, Fabien Grisé, Randall L. McEntaffer, James H. Tutt, and Cecilia R. Fasano "Curved diffractive optics for high energy spectroscopy: current status and challenges", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 1309312 (22 August 2024); https://doi.org/10.1117/12.3020294

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