Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, Epiciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Conference papers

Variation around the Pyramid theme: optical recombination and optimal use of photons

Abstract : We propose a new type of Wave Front Sensor (WFS) derived from the Pyramid WFS (PWFS). This new WFS,called the Flattened Pyramid-WFS (FPWFS), has a reduced Pyramid angle in order to optically overlap the fourpupil images into an unique intensity. This map is then used to derive the phase information. In this paper thisnew WFS is compared to two existing WFSs, namely the PWFS and the Modulated PWFS (MPWFS) followingtests about sensitivity, linearity range and low photon flux behavior. The FPWFS turns out to be more linearthan a modulated pyramid for the high-spatial order aberrations but it provides an improved sensitivity comparedto the non-modulated pyramid. Furthermore, the pixel arrangement being more efficient than for the PWFS,the FPWFS seems particularly well suited for high-contrast applications. A first quick study of the influenceof the angle of the pyramid shows that, it is possible, with a quite constant linear range, to adjust the spatialfrequencies range where the sensitivity is the best. Finally, we also show that replacing the pyramid with aflattened cone also leads to very promising noise propagation properties.
Document type :
Conference papers
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03580797
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, February 18, 2022 - 5:19:34 PM
Last modification on : Sunday, February 20, 2022 - 3:02:03 AM

Identifiers

Collections

Citation

O. Fauvarque, B. Neichel, T. Fusco, J. F. Sauvage. Variation around the Pyramid theme: optical recombination and optimal use of photons. Proceedings of the Fourth AO4ELT Conference. UCLA Conference Center, 0000, à renseigner, Unknown Region. pp.E3, ⟨10.20353/K3T4CP1131539⟩. ⟨insu-03580797⟩

Share

Metrics

Record views

3