A transmission hologram for slitless spectrophotometry on a convergent telescope beam. 1. Focus and resolution
| Autor: | S. Bongard, L. Le Guillou, M Moniez, Y. Copin, Michael W. Coughlin, Y Gentet, S Dagoret-Campagne, J Neveu |
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| Přispěvatelé: | Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP) |
| Rok vydání: | 2021 |
| Předmět: |
Holographic optical element
Holography FOS: Physical sciences Physics::Optics Grating 01 natural sciences law.invention 010309 optics Telescope Optics law Observatory 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] Instrumentation and Methods for Astrophysics (astro-ph.IM) 010303 astronomy & astrophysics Spectrograph Astrophysics::Galaxy Astrophysics Physics business.industry Resolution (electron density) Astrophysics::Instrumentation and Methods for Astrophysics Astronomy and Astrophysics Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics Astrophysics - Instrumentation and Methods for Astrophysics Focus (optics) business |
| Zdroj: | Mon.Not.Roy.Astron.Soc. Mon.Not.Roy.Astron.Soc., 2021, 506 (4), pp.5589-5605. ⟨10.1093/mnras/stab2109⟩ |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stab2109 |
| Popis: | We report in this paper the test of a plane holographic optical element to be used as an aberration-corrected grating for a slitless spectrograph, inserted in a convergent telescope beam. Our long term objective is the optimisation of a specific hologram to switch the auxiliary telescope imager of the Vera Rubin Observatory into an accurate slitless spectrograph, dedicated to the atmospheric transmission measurement. We present and discuss here the promising results of tests performed with prototype holograms at the CTIO $0.9\,$m telescope during a run of 17 nights in May-June 2017. After their on-sky geometrical characterisation, the performances of the holograms as aberration-balanced dispersive optical elements have been established by analysing spectra obtained from spectrophotometric standard stars and narrow-band emitter planetary nebulae. Thanks to their additional optical function, our holographic disperser prototypes allow to produce significantly better focused spectra within the full visible wavelength domain $[370,1050]\,$nm than a regular grating, which suffers from strong defocusing and aberrations when used in similar conditions. We show that the resolution of our slitless on-axis spectrograph equipped with the hologram approaches its theoretical performance. While estimating the benefits of an hologram for the spectrum resolution, the roadmap to produce a competitive holographic element for the Vera Rubin Observatory auxiliary telescope has been established. 17 pages, 27 figures, 4 appendices, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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