16 - 21 June 2024
Yokohama, Japan
Conference 13093 > Paper 13093-107
Paper 13093-107

Realignment and performance verification of two-mirror focal corrector optics for FIREBall-2 using computer generated hologram (CGH)

On demand | Presented live 17 June 2024

Abstract

The Faint Intergalactic-medium Red-shifted Emission Balloon (FIREBall-2) is a joint NASA/CNES-funded balloon-borne UV telescope to map faint UV emission from the circumgalactic medium around low redshift galaxies. The initial September 2018 flight encountered challenges, including a balloon breach and subsequent damage during landing, impacting the two large telescope mirrors and the critical focal corrector. Likely due to landing shock, the focal corrector experienced misalignment beyond tolerance, necessitating re-evaluation and realignment. This paper outlines a comprehensive approach to realigning the focal corrector using a computer-generated hologram (CGH) and a Zygo interferometer for feedback. The CGH enables precise alignment corrections in various degrees of freedom, while interferometer feedback aids in reducing aberrations. The paper details the methodology for optical alignment, surface measurement, and performance evaluation of the focal corrector, emphasizing its successful integration into the FB-2 spectrograph in early 2023 for the upcoming September 2023 flight.

Presenter

The Univ. of Arizona (United States)
Simran Agarwal is a skilled Optical Engineer, with a strong educational background and practical experience in optical sciences. She is currently pursuing her Ph.D. in Optical Sciences at the University of Arizona, expected to be completed by May 2025. Simran holds a master’s degree in Optical Sciences from the same university and an MS in Electrical and Computer Engineering from Bangkok University, along with a Bachelor's degree in Electronics Engineering from the Asian Institute of Technology. Simran's work experience comprises of significant contributions in stray light analysis for the Aspera NASA Pioneers Cubesat Mission at Steward Observatory, where she has been working since February 2021.She also played a key role in the Alignment and Testing of the FIREBall-2 Optics at the same observatory since May 2019. Here, she led the team for aligning the spectrograph and focal corrector optics of a sub-orbital balloon payload FIREBall-2.
Application tracks: Astrophotonics
Presenter/Author
The Univ. of Arizona (United States)
Author
The Univ. of Arizona (United States)
Author
The Univ. of Arizona (United States)
Author
The Univ. of Arizona (United States)
Author
Olivia Jones
The Univ. of Arizona (United States)
Author
The Univ. of Arizona (United States)
Author
The Univ. of Arizona (United States)
Author
Columbia Univ. (United States)
Author
Bruno Milliard
Lab. d'Astrophysique de Marseille (France)
Author
Cahill Center for Astrophysics,California Institute of Technology (United States)
Author
Cahill Center for Astrophysics,California Institute of Technology (United States)
Author
Ignacio Cevallos-Aleman
Columbia Univ. (United States)
Author
Steward Observatory (United States)
Author
Cahill Center for Astrophysics,California Institute of Technology (United States)
Author
Cahill Center for Astrophysics,California Institute of Technology (United States)
Author
Gillian Kyne
Jet Propulsion Laboratory (United States)
Author
Keri Hoadley
University of Iowa (United States)
Author
Jet Propulsion Laboratory, California Institute of Technology (United States)
Author
David Valls-Gabaud
Observatoire de Paris, CNRS (France)
Author
The Univ. of Arizona (United States)