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On-sky demonstration of a vector Zernike wavefront sensor in a cascaded adaptive optics system — arXiv:2608.30666

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.30666
License (as archived): CC0-1.0
Archived: 2026-10-17T10:32:16.852Z
SHA-256 of the archived text: 802342257b1d4f0db1fb207308b0f3c323f3546d27568bcfb958177b2268f679
Stable URL of this page: https://metraipolis.com/documento/dc_68ff1069f330

How to cite

On-sky demonstration of a vector Zernike wavefront sensor in a cascaded adaptive optics system — arXiv:2608.30666 — arXiv (en), https://arxiv.org/abs/2608.30666 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_68ff1069f330 (Metraipolis archive dc_68ff1069f330, sha256 802342257b1d4f0db1fb207308b0f3c323f3546d27568bcfb958177b2268f679)

BibTeX

@misc{dc68ff1069f330,
  title = {On-sky demonstration of a vector Zernike wavefront sensor in a cascaded adaptive optics system — arXiv:2608.30666},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.30666},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_68ff1069f330; sha256 802342257b1d4f0db1fb207308b0f3c323f3546d27568bcfb958177b2268f679},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.30666. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

To directly image and characterise Earth-like exoplanets, future high-contrast instruments will require adaptive-optics systems operating at increasingly high loop frequencies to reduce temporal errors. Increasing the loop frequency reduces the signal-to-noise ratio per wavefront-sensor frame, making highly sensitive wavefront sensors, such as the Zernike wavefront sensor (ZWFS), attractive candidates. However, the limited dynamic range of the classical ZWFS makes on-sky operation challenging. We therefore investigate whether a ZWFS can be used as a second-stage sensor in an on-sky cascaded adaptive-optics system. To this end, we added a second AO stage, called OZIRIIS, to the PAPYRUS platform at the Observatoire de Haute-Provence. OZIRIIS combines a vector Zernike wavefront sensor (v-ZWFS) with a 97-actuator deformable mirror operating at 400 Hz downstream of the pyramid-based first AO stage. Real-time control relied on a single ZWFS signal, while the full v-ZWFS was used a posteriori for non-linear reconstruction and telemetry analysis. The second-stage correction increased the measured Strehl ratio by up to 16 percentage points. Analysis of the telemetry using the full v-ZWFS to reconstruct residuals revealed optical-gain effects affecting the ZWFS at low Strehl ratio. The good agreement between on-sky measurements and numerical simulations further supports the calibration strategy based on synthetic reference signals and interaction matrices. These results demonstrate that Zernike wavefront sensing can be operated in closed loop on sky and support its use in future cascaded extreme adaptive-optics systems.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-01 in astro-ph.IM).
Categorie arXiv: Instrumentation and Methods for Astrophysics (astro-ph.IM).
Pagina del lavoro: https://arxiv.org/abs/2608.30666 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-17T10:18:17.120Z dalla pagina https://arxiv.org/catchup/astro-ph.IM/2026-09-01?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).