A transmission hologram for slitless spectrophotometry on a convergent telescope beam
4 affiliations
- 1Laboratoire de Physique des deux infinis Irène Joliot-Curie (IJCLab), Université Paris-Saclay, CNRS/IN2P3
- 2Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, CNRS/IN2P3
- 3IP2I – Plateforme LMA
- 4Institut de mécanique céleste et de calcul des éphémérides, Observatoire de Paris
Abstract
Context . In this paper, we provide details on the optimization and characterization of the hologram described in a companion paper published in 2021, where we demonstrated the superiority of a holographic optical element over a periodic grating as a disperser installed in the path of a converging beam on an on-axis detector (unbent spectrograph) for slitless spectroscopy. This hologram is now part of the auxiliary telescope (AuxTel) at the Rubin -LSST observatory, a refurbished telescope designed to serve as both an imager and a spectrophotometer for measuring the transparency of the atmosphere as a function of wavelength.
Aims . We describe the steps and results of optimizing the final optical holographic element installed on the spectrograph, with an emphasis on the equipment and modeling tools used. The goal was to produce a hologram with the best diffraction performance across the entire spectrum covered by the filters of the Rubin -LSST observatory’s main telescope.
Methods . We utilized our technical resources, including an optical bench and telescopes for sky measurements, as well as specialized modeling tools, which enabled us to determine the optimal production parameters for the AuxTel hologram after four prototyping phases. We also conducted on-sky checks and measurements using a range of telescopes.
Results . Thanks to this optimization, we succeeded in achieving a maximum first-order diffraction transmission of 32% with our thin hologram, a value that is very close to the theoretical maximum possible. This hologram has been in place on AuxTel’s spectrograph since February 2021 and has been performing satisfactorily ever since, in conjunction with analysis software adapted to slitless spectroscopy.
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BibTeX
@article{dagoretcampagne2026transmission,
title = {{A transmission hologram for slitless spectrophotometry on a convergent telescope beam}},
author = {S. Dagoret-Campagne and M. Moniez and J. Neveu and A. Blot and P. Antilogus and C. Juramy and L. Le Guillou and Ph. Repain and E. Sepulveda and C. Michel and F. Colas},
journal = {Astronomy \& Astrophysics},
year = {2026},
month = nov,
doi = {10.1051/0004-6361/202557458},
url = {https://www.aanda.org/10.1051/0004-6361/202557458},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - A transmission hologram for slitless spectrophotometry on a convergent telescope beam
AU - S. Dagoret-Campagne
AU - M. Moniez
AU - J. Neveu
AU - A. Blot
AU - P. Antilogus
AU - C. Juramy
AU - L. Le Guillou
AU - Ph. Repain
AU - E. Sepulveda
AU - C. Michel
AU - F. Colas
PY - 2026
DA - 2026/11/06
JO - Astronomy & Astrophysics
DO - 10.1051/0004-6361/202557458
UR - https://www.aanda.org/10.1051/0004-6361/202557458
AB - Context . In this paper, we provide details on the optimization and characterization of the hologram described in a companion paper published in 2021, where we demonstrated the superiority of a holographic optical element over a periodic grating as a disperser installed in the path of a converging beam on an on-axis detector (unbent spectrograph) for slitless spectroscopy. This hologram is now part of the auxiliary telescope (AuxTel) at the Rubin -LSST observatory, a refurbished telescope designed to serve as both an imager and a spectrophotometer for measuring the transparency of the atmosphere as a function of wavelength. Aims . We describe the steps and results of optimizing the final optical holographic element installed on the spectrograph, with an emphasis on the equipment and modeling tools used. The goal was to produce a hologram with the best diffraction performance across the entire spectrum covered by the filters of the Rubin -LSST observatory’s main telescope. Methods . We utilized our technical resources, including an optical bench and telescopes for sky measurements, as well as specialized modeling tools, which enabled us to determine the optimal production parameters for the AuxTel hologram after four prototyping phases. We also conducted on-sky checks and measurements using a range of telescopes. Results . Thanks to this optimization, we succeeded in achieving a maximum first-order diffraction transmission of 32% with our thin hologram, a value that is very close to the theoretical maximum possible. This hologram has been in place on AuxTel’s spectrograph since February 2021 and has been performing satisfactorily ever since, in conjunction with analysis software adapted to slitless spectroscopy.
SN - 0004-6361
SN - 1432-0746
ER -