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18 May 2022 Performance of a complementary metal-oxide-semiconductor sensor for laser guide star wavefront sensing
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Abstract

The adaptive optics systems of future Extremely Large Telescopes (ELTs) will be assisted with laser guide stars (LGS) which will be created in the sodium layer at a height of ≈90  km above the telescopes. In a Shack–Hartmann wavefront sensor, the long elongation of LGS spots on the sub-pupils far apart from the laser beam axis constraints the design of the wavefront sensor (WFS) which must be able to fully sample the elongated spots without undersampling the non-elongated spots. To fulfill these requirements, a newly released large complementary metal oxide semiconductor sensor with 1100  ×  1600  pixels and 9  μm pixel pitch could be employed. Here, we report on the characterization of such a sensor in terms of noise and linearity, and we evaluate its performance for wavefront sensing based on the spot centroid variations. We then illustrate how this new detector can be integrated into a full LGS WFS for both the European Southern Observatory’s ELT and the Thirty Meter Telescope.

© 2022 Society of Photo-Optical Instrumentation Engineers (SPIE) 2329-4124/2022/$28.00 © 2022 SPIE
Zibo Ke, Felipe Pedreros Bustos, Jenny Atwood, Anne Costille, Kjetil Dohlen, Kacem El Hadi, Jean-Luc Gach, Glen Herriot, Zoltan Hubert, Pierre Jouve, Patrick Rabou, Jean-Pierre Veŕan, Lianqi Wang, Thierry Fusco, and Benoît Neichel "Performance of a complementary metal-oxide-semiconductor sensor for laser guide star wavefront sensing," Journal of Astronomical Telescopes, Instruments, and Systems 8(2), 021511 (18 May 2022). https://doi.org/10.1117/1.JATIS.8.2.021511
Received: 8 October 2021; Accepted: 14 April 2022; Published: 18 May 2022
JOURNAL ARTICLE
21 PAGES


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Cited by 1 scholarly publication.
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KEYWORDS
Sensors

CMOS sensors

Wavefront sensors

Photons

Relays

Adaptive optics

Telescopes

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