TY - GEN
T1 - Realignment and performance verification o f t wo-mirror focal corrector optics for FIREBall-2 using computer generated hologram (CGH)
AU - Agarwal, Simran
AU - Khan, Aafaque R.
AU - Bradley, Harrison
AU - Chung, Haeun
AU - Kerkeser, Ipek Nazende
AU - Jones, Olivia
AU - Hamden, Erika
AU - Schiminovich, David
AU - Milliard, Bruno
AU - Picouet, Vincent
AU - Miles, Drew M.
AU - Cevallos-Aleman, Ignacio
AU - Lin, Zeren
AU - Li, Jessica S.
AU - Melso, Nicole
AU - Martin, Christopher
AU - Hoadley, Keri
AU - Kyne, Gillian
AU - Nikzad, Shouleh
AU - Valls-Gabaud, David
N1 - Publisher Copyright:
© 2024 SPIE.
PY - 2024
Y1 - 2024
N2 - 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 e ncountered c hallenges, i ncluding a b alloon b reach 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.
AB - 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 e ncountered c hallenges, i ncluding a b alloon b reach 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.
KW - CGM
KW - Computer Generated Holograms
KW - Interferometric alignment
KW - Optical Alignment
KW - Optical Metrology
KW - Scientific-ballooning
KW - UV Astronomy
UR - http://www.scopus.com/inward/record.url?scp=85207645691&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85207645691&partnerID=8YFLogxK
U2 - 10.1117/12.3020834
DO - 10.1117/12.3020834
M3 - Conference contribution
AN - SCOPUS:85207645691
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Space Telescopes and Instrumentation 2024
A2 - den Herder, Jan-Willem A.
A2 - Nikzad, Shouleh
A2 - Nakazawa, Kazuhiro
PB - SPIE
T2 - Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray
Y2 - 16 June 2024 through 21 June 2024
ER -