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3 October 2022 An efficient high-etendue spectrometer
James P. McGuire Jr., Erika T. Hamden
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Proceedings Volume 12235, Imaging Spectrometry XXV: Applications, Sensors, and Processing; 122350A (2022) https://doi.org/10.1117/12.2646738
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States
Abstract
Hyperion is a Far-UV (FUV) mission that investigates the birth clouds of stars by probing the nature, extent, and state of H2 at the crucial atomic-to-molecular interstellar medium boundary layer. Hyperion examines the fuel for star formation directly by observing the molecular interface between dense, star-forming clouds, the diffuse interstellar environment, and the stars that arise from these regions. Hyperion observes over the 138.5-161.5 nm spectral range with resolution greater than R==50,000. Mapping faint clouds over large areas of sky requires an efficient, high-etendue spectrometer. Conventional cross-dispersed Echelle spectrometers suffer from low efficiency (due to the need for a cross-disperser) and limited etendue due to the aberration correction. We describe an efficient high-etendue spectrometer approach that uses a single grating and a 64 mega-pixel array. The spectrometer is a compact f/5 Offner derivative with free-form surfaces and a single diffraction grating.
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James P. McGuire Jr. and Erika T. Hamden "An efficient high-etendue spectrometer", Proc. SPIE 12235, Imaging Spectrometry XXV: Applications, Sensors, and Processing, 122350A (3 October 2022); https://doi.org/10.1117/12.2646738
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KEYWORDS
Spectroscopy
Mirrors
Clouds
Diffraction gratings
Stars
Spectral resolution
Spherical lenses
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