Next generation aberration-correcting diffraction gratings

Matthew Beasley; Randall McEntaffer; Nathaniel Cunningham

doi:10.1117/12.2625818

26 August 2022 Next generation aberration-correcting diffraction gratings

Matthew Beasley, Randall McEntaffer, Nathaniel Cunningham

Proceedings Volume 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray; 1218118 (2022) https://doi.org/10.1117/12.2625818
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

We have developed the capability to optimize a diffraction grating with arbitrary groove density and direction as a function of location. The added degrees of freedom allow additional correction of optical aberrations beyond what is available to holographic recordings. Since the groove direction and density can be independent for all points on the grating, the design is not constrained by the limitations of ensuring that the grooves follow a single parametrized function. The grooves are then written with e-beam fabrication techniques onto a silicon substrate. We present the results from our project to fabricate aberration-correcting gratings using direct writing in silicon. Two gratings were produced as part of this work, one is a demonstration a Fresnel plate to verify that the grating was fabricated as intended. The second grating was designed as part of a Raman spectrograph and provides excellent optical performance over the designed passband.

Conference Presentation

Citation Download Citation

Matthew Beasley, Randall McEntaffer, and Nathaniel Cunningham "Next generation aberration-correcting diffraction gratings", Proc. SPIE 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray, 1218118 (26 August 2022); https://doi.org/10.1117/12.2625818

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