scholarly journals Upgrading the Gemini Planet Imager calibration unit with a photon counting focal plane wavefront sensor

2020 ◽  
Author(s):  
Christian Marois ◽  
Benjamin L. Gerard ◽  
Olivier Lardière ◽  
Andre Anthony ◽  
Colin Bradley ◽  
...  
Keyword(s):  
Focal Plane ◽  
Photon Counting ◽  
Wavefront Sensor ◽  
Plane Wavefront ◽  
Calibration Unit

scholarly journals Self-coherent camera as a focal plane wavefront sensor: simulations

2009 ◽  
Vol 509 ◽  
pp. A31 ◽  
Author(s):  
R. Galicher ◽  
P. Baudoz ◽  
G. Rousset ◽  
J. Totems ◽  
M. Mas
Keyword(s):  
Focal Plane ◽  
Wavefront Sensor ◽  
Plane Wavefront

All-fibre focal-plane wavefront sensor

2020 ◽  
Author(s):  
B.R.M. Norris ◽  
J. Wei ◽  
C.H. Betters ◽  
A. Wong ◽  
S.G. Leon-Saval
Keyword(s):  
Focal Plane ◽  
Wavefront Sensor ◽  
Plane Wavefront

scholarly journals SCExAO: First Results and On-Sky Performance

2013 ◽  
Vol 8 (S299) ◽  
pp. 34-35 ◽  
Author(s):  
Thayne Currie ◽  
Olivier Guyon ◽  
Frantz Martinache ◽  
Christophe Clergeon ◽  
Michael McElwain ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Focal Plane ◽  
Closed Loop ◽  
Giant Planets ◽  
Wavefront Sensor ◽  
Strehl Ratio ◽  
Wavefront Control ◽  
Contrast Gain ◽  
First Results ◽  
Plane Wavefront

AbstractWe present new on-sky results for the Subaru Coronagraphic Extreme Adaptive Optics imager (SCExAO) verifying and quantifying the contrast gain enabled by key components: the closed-loop coronagraphic low-order wavefront sensor (CLOWFS) and focal plane wavefront control (“speckle nulling”). SCExAO will soon be coupled with a high-order, Pyramid wavefront sensor which will yield > 90% Strehl ratio and enable 106–107 contrast at small angular separations allowing us to image gas giant planets at solar system scales. Upcoming instruments like VAMPIRES, FIRST, and CHARIS will expand SCExAO's science capabilities.

scholarly journals An all-photonic focal-plane wavefront sensor

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Barnaby R. M. Norris ◽  
Jin Wei ◽  
Christopher H. Betters ◽  
Alison Wong ◽  
Sergio G. Leon-Saval
Keyword(s):  
Adaptive Optics ◽  
Focal Plane ◽  
Mean Squared Error ◽  
Single Mode ◽  
Wavefront Sensor ◽  
Wavefront Sensors ◽  
Single Mode Fibre ◽  
Squared Error ◽  
Wavefront Error ◽  
Plane Wavefront

Abstract Adaptive optics (AO) is critical in astronomy, optical communications and remote sensing to deal with the rapid blurring caused by the Earth’s turbulent atmosphere. But current AO systems are limited by their wavefront sensors, which need to be in an optical plane non-common to the science image and are insensitive to certain wavefront-error modes. Here we present a wavefront sensor based on a photonic lantern fibre-mode-converter and deep learning, which can be placed at the same focal plane as the science image, and is optimal for single-mode fibre injection. By measuring the intensities of an array of single-mode outputs, both phase and amplitude information on the incident wavefront can be reconstructed. We demonstrate the concept with simulations and an experimental realisation wherein Zernike wavefront errors are recovered from focal-plane measurements to a precision of 5.1 × 10−3 π radians root-mean-squared-error.

Focal plane wavefront sensor sensitivity for ELT planet finder

2010 ◽  
Author(s):  
P. Baudoz ◽  
M. Mas ◽  
R. Galicher ◽  
G. Rousset
Keyword(s):  
Focal Plane ◽  
Wavefront Sensor ◽  
Sensor Sensitivity ◽  
Plane Wavefront

Fast focal plane wavefront sensing as a second stage adaptive optics wavefront sensor

2020 ◽  
Author(s):  
Benjamin L. Gerard ◽  
Jean-Pierre Véran ◽  
Garima Singh ◽  
Glen Herriot ◽  
Olivier Lardière ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Focal Plane ◽  
Wavefront Sensor ◽  
Wavefront Sensing ◽  
Second Stage ◽  
Plane Wavefront

scholarly journals Focal plane wavefront sensor achromatization: The multireference self-coherent camera

2016 ◽  
Vol 588 ◽  
pp. A136 ◽  
Author(s):  
J. R. Delorme ◽  
R. Galicher ◽  
P. Baudoz ◽  
G. Rousset ◽  
J. Mazoyer ◽  
...  
Keyword(s):  
Focal Plane ◽  
Wavefront Sensor ◽  
Plane Wavefront

scholarly journals LIFT: a focal-plane wavefront sensor for real-time low-order sensing on faint sources

2010 ◽  
Vol 35 (18) ◽  
pp. 3036 ◽  
Author(s):  
Serge Meimon ◽  
Thierry Fusco ◽  
Laurent M. Mugnier
Keyword(s):  
Real Time ◽  
Focal Plane ◽  
Wavefront Sensor ◽  
Plane Wavefront ◽  
Low Order

scholarly journals Calibration of the island effect: Experimental validation of closed-loop focal plane wavefront control on Subaru/SCExAO

2018 ◽  
Vol 610 ◽  
pp. A18 ◽  
Author(s):  
M. N’Diaye ◽  
F. Martinache ◽  
N. Jovanovic ◽  
J. Lozi ◽  
O. Guyon ◽  
...  
Keyword(s):  
Image Quality ◽  
Focal Plane ◽  
Closed Loop ◽  
Near Infrared ◽  
Experimental Tests ◽  
Relative Increase ◽  
Visible Range ◽  
Wavefront Control ◽  
Island Effect ◽  
Plane Wavefront

Context. Island effect (IE) aberrations are induced by differential pistons, tips, and tilts between neighboring pupil segments on ground-based telescopes, which severely limit the observations of circumstellar environments on the recently deployed exoplanet imagers (e.g., VLT/SPHERE, Gemini/GPI, Subaru/SCExAO) during the best observing conditions. Caused by air temperature gradients at the level of the telescope spiders, these aberrations were recently diagnosed with success on VLT/SPHERE, but so far no complete calibration has been performed to overcome this issue. Aims. We propose closed-loop focal plane wavefront control based on the asymmetric Fourier pupil wavefront sensor (APF-WFS) to calibrate these aberrations and improve the image quality of exoplanet high-contrast instruments in the presence of the IE. Methods. Assuming the archetypal four-quadrant aperture geometry in 8 m class telescopes, we describe these aberrations as a sum of the independent modes of piston, tip, and tilt that are distributed in each quadrant of the telescope pupil. We calibrate these modes with the APF-WFS before introducing our wavefront control for closed-loop operation. We perform numerical simulations and then experimental tests on a real system using Subaru/SCExAO to validate our control loop in the laboratory and on-sky. Results. Closed-loop operation with the APF-WFS enables the compensation for the IE in simulations and in the laboratory for the small aberration regime. Based on a calibration in the near infrared, we observe an improvement of the image quality in the visible range on the SCExAO/VAMPIRES module with a relative increase in the image Strehl ratio of 37%. Conclusions. Our first IE calibration paves the way for maximizing the science operations of the current exoplanet imagers. Such an approach and its results prove also very promising in light of the Extremely Large Telescopes (ELTs) and the presence of similar artifacts with their complex aperture geometry.

scholarly journals Focal Plane Wavefront Sensing with the FAST TGV Coronagraph

2020 ◽  
Vol 132 (1012) ◽  
pp. 064401
Author(s):  
Benjamin L. Gerard ◽  
Christian Marois
Keyword(s):  
Focal Plane ◽  
Wavefront Sensing ◽  
Plane Wavefront
Sign in / Sign up

Export Citation Format

Share Document