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

Simran Agarwal; Aafaque R. Khan; Harrison Bradley; Haeun Chung; Ipek Nazende Kerkeser; Olivia Jones; Erika Hamden; David Schiminovich; Bruno Milliard; Vincent Picouet; Drew M. Miles; Ignacio Cevallos-Aleman; Zeren Lin; Jessica S. Li; Nicole Melso; Christopher Martin; Keri Hoadley; Gillian Kyne; Shouleh Nikzad; David Valls-Gabaud

doi:10.1117/12.3020834

21 August 2024 Realignment and performance verification of two-mirror focal corrector optics for FIREBall-2 using computer generated hologram (CGH)

Simran Agarwal, Aafaque R. Khan, Harrison Bradley, Haeun Chung, Ipek Nazende Kerkeser, Olivia Jones, Erika Hamden, David Schiminovich, Bruno Milliard, Vincent Picouet, Drew M. Miles, Ignacio Cevallos-Aleman, Zeren Lin, Jessica S. Li, Nicole Melso, Christopher Martin, Keri Hoadley, Gillian Kyne, Shouleh Nikzad, David Valls-Gabaud

Author Affiliations +

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 130932V (2024) https://doi.org/10.1117/12.3020834
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The Faint Intergalactic-medium Redshifted Emission Balloon (FB-2), a collaborative NASA/CNES suborbital balloon telescope, targets the mapping of faint UV emissions 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 reevaluation 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 September 2023 flight.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Simran Agarwal, Aafaque R. Khan, Harrison Bradley, Haeun Chung, Ipek Nazende Kerkeser, Olivia Jones, Erika Hamden, David Schiminovich, Bruno Milliard, Vincent Picouet, Drew M. Miles, Ignacio Cevallos-Aleman, Zeren Lin, Jessica S. Li, Nicole Melso, Christopher Martin, Keri Hoadley, Gillian Kyne, Shouleh Nikzad, and David Valls-Gabaud "Realignment and performance verification of two-mirror focal corrector optics for FIREBall-2 using computer generated hologram (CGH)", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 130932V (21 August 2024); https://doi.org/10.1117/12.3020834

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