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18 December 2023 Aperiodic multi-notch FBG filters for astronomical positronium detection
Qingshan Yu, Liguo Luo, Göran Edvell, Christopher Betters, Jin Wei, Simon Ellis, Joss Bland-Hawthorn, Sergio Leon-Saval
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Proceedings Volume 12965, AOPC 2023: Novel Technologies and Instruments for Astronomical Imaging and Spectroscopy; 129650D (2023) https://doi.org/10.1117/12.3008044
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China
Abstract
Current astronomical detection of Positronium (Ps) atoms through gamma-ray emission is inherently limited by a 3-degree angular resolution. Alternatively, the triplet state of Ps is capable of producing a recombination spectrum in the near-infrared band, which would provide the potential to increase the angular resolution by a factor of 104 . The most promising signature is the Ps Balmer alpha line (Psα) at 1312.22nm. This observation scheme has never been implemented from ground-based telescopes due to the bright airglow. Now, the FBG-based OH suppression technique presents a promising solution for removing airglow emission lines surrounding the target signature. In this proceeding, we present the design and fabrication details of the first astronomy J-band FBG filters and early results of the OH suppression unit specifically developed for Ps detection.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
Citation Download Citation
Qingshan Yu, Liguo Luo, Göran Edvell, Christopher Betters, Jin Wei, Simon Ellis, Joss Bland-Hawthorn, and Sergio Leon-Saval "Aperiodic multi-notch FBG filters for astronomical positronium detection", Proc. SPIE 12965, AOPC 2023: Novel Technologies and Instruments for Astronomical Imaging and Spectroscopy, 129650D (18 December 2023); https://doi.org/10.1117/12.3008044
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KEYWORDS
Fiber Bragg gratings
Tunable filters
Design and modelling
Astronomy
Spectrographs
Bragg wavelengths
Modulation
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