Details

Autor(en) / Beteiligte

• Fauvarque, Olivier
• Neichel, Benoit
• Fusco, Thierry
• Sauvage, Jean-Francois

Titel

Variation around a pyramid theme: optical recombination and optimal use of photons

Ist Teil von

• Optics letters, 2015-08, Vol.40 (15), p.3528-3531

Ort / Verlag

United States: Optical Society of America - OSA Publishing

Erscheinungsjahr

2015

Quelle

OSA_美国光学学会数据库1

Beschreibungen/Notizen

• 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 four pupil images into an unique intensity. This map is then used to derive the phase information. In this Letter, this new WFS is compared to three existing WFSs, namely the PWFS, the modulated PWFS (MPWFS), and the Zernike WFS (ZWFS) following tests about sensitivity, linearity range, and low-photon-flux behavior. The FPWFS turns out to be more linear than a modulated pyramid for the high-spatial order aberrations, but it provides an improved sensitivity compared to the non-modulated pyramid. The noise propagation may even be as low as the ZWFS for some given radial orders. Furthermore, the pixel arrangement being more efficient than for the PWFS, the FPWFS seems particularly well suited for high-contrast applications.