37 citations · 202 across the 41 of their papers we have counts for
12 papers · 1 filter
Coronagraph-based wavefront sensors for the high Strehl regime
Vincent Chambouleyron, J. Kent Wallace, Rebecca Jensen-Clem +1
A crucial component of the high-contrast instrumental chain in astronomy is the wavefront sensor (WFS). A key property of this component is its sensitivities, which reflect its abi…
Performance comparison of the Shack-Hartmann and pyramid wavefront sensors with a laser guide star for 40 m telescopes
Francisco Oyarzun, Cedric-Taissir Heritier, Vincent Chambouleyron +3
Context. The new giant segmented mirror telescopes will use laser guide stars (LGS) for their adaptive optics (AO) systems. Two options to use as wavefront sensors (WFS) are the Sh…
GPI 2.0: Exploring The Impact of Different Readout Modes on the Wavefront Sensor's EMCCD
Clarissa R. Do Ó, Saavidra Perera, Jérôme Maire +26
The Gemini Planet Imager (GPI) is a high contrast imaging instrument that aims to detect and characterize extrasolar planets. GPI is being upgraded to GPI 2.0, with several subsyst…
Real-time control and data standardization on various telescopes and benches
Nour Skaf, Rebecca Jensen-Clem, Aaron Hunter +19
Real-time control (RTC) is pivotal for any Adaptive Optics (AO) system, including high-contrast imaging of exoplanets and circumstellar environments. It is the brain of the AO syst…
Reconstruction methods for the phase-shifted Zernike wavefront sensor
Vincent Chambouleyron, Mahawa Cissé, Maïssa Salama +8
The Zernike wavefront sensor (ZWFS) stands out as one of the most sensitive optical systems for measuring the phase of an incoming wavefront, reaching photon efficiencies close to…
Implementation and Characterization of the Vector Vortex Coronagraph on the SEAL Testbed
Ashai Moreno, Vincent Chambouleyron, Rebecca M. Jensen-Clem +3
The Santa Cruz Extreme AO Lab (SEAL) testbed is an optical bench meant to design and develop new wavefront control techniques for high-contrast imaging for segmented telescopes. Th…
Towards understanding interactions between the AO system and segment co-phasing with the vector-Zernike wavefront sensor on Keck
Maïssa Salama, Charlotte Guthery, Vincent Chambouleyron +14
We extend our previous demonstration of the first on-sky primary mirror segment closed-loop control on Keck using a vector-Zernike wavefront sensor (vZWFS), which improved the Stre…
The future looks dark: improving high contrast imaging with hyper-parameter optimization for data-driven predictive wavefront control
J. Fowler, Rebecca Jensen-Clem, Maaike A. M. van Kooten +2
The direct imaging and characterization of exoplanets requires extreme adaptive optics (XAO), achieving exquisite wavefront correction (upwards of 90 Strehl) over a narrow fiel…
Photonic lantern wavefront reconstruction in a multi-wavefront sensor single-conjugate adaptive optics system
Aditya R. Sengupta, Jordan Diaz, Benjamin L. Gerard +6
Exoplanet direct imaging using adaptive optics (AO) is often limited by non-common path aberrations (NCPAs) and aberrations that are invisible to traditional pupil-plane wavefront…
Keck Primary Mirror Closed-Loop Segment Control using a Vector-Zernike Wavefront Sensor
Maissa Salama, Charlotte Guthery, Vincent Chambouleyron +17
We present the first on-sky segmented primary mirror closed-loop piston control using a Zernike wavefront sensor (ZWFS) installed on the Keck II telescope. Segment co-phasing error…
Expected performance of the Pyramid wavefront sensor with a laser guide star for 40 m class telescopes
Francisco Oyarzún, Vincent Chambouleyron, Benoit Neichel +2
The use of artificial Laser Guide Stars (LGS) is planned for the new generation of giant segmented mirror telescopes, to extend the sky coverage of their adaptive optics systems. T…
Strategy for sensing petal mode in presence of AO residual turbulence with pyramid wavefront sensor
Nicolas Levraud, Vincent Chambouleyron, Jean François Sauvage +9
With the Extremely Large Telescope-generation telescopes come new challenges. The complexity of these telescopes' pupil creates new problems for Adaptive Optics. In particular, the…