Results 1 to 10 of about 2,024,523 (345)

An all-photonic focal-plane wavefront sensor [PDF]

open access: goldNature Communications, 2020
Adaptive optics wavefront sensors need to be in a pupil plane and are insensitive to certain wavefront-error modes. The authors present a wavefront sensor based on a photonic lantern fibre-mode-converter and deep learning, which can be placed at the same
Barnaby R. M. Norris   +4 more
doaj   +6 more sources

A Method Used to Improve the Dynamic Range of Shack–Hartmann Wavefront Sensor in Presence of Large Aberration [PDF]

open access: yesSensors, 2022
With the successful application of the Shack–Hartmann wavefront sensor in measuring aberrations of the human eye, researchers found that, when the aberration is large, the local wavefront distortion is large, and it causes the spot corresponding to the ...
Wen Yang, Jianli Wang, Bin Wang
doaj   +3 more sources

Meta Shack–Hartmann wavefront sensor with large sampling density and large angular field of view: phase imaging of complex objects [PDF]

open access: yesLight: Science & Applications
Shack–Hartmann wavefront sensors measure the local slopes of an incoming wavefront based on the displacement of focal spots created by a lenslet array, serving as key components for adaptive optics for astronomical and biomedical imaging.
Gi-Hyun Go   +5 more
doaj   +3 more sources

Impact of CMOS Pixel and Electronic Circuitry in the Performance of a Hartmann-Shack Wavefront Sensor [PDF]

open access: goldSensors, 2018
This work presents a numerical simulation of a Hartmann-Shack wavefront sensor (WFS) that assesses the impact of integrated electronic circuitry on the sensor performance, by evaluating a full detection chain encompassing wavefront sampling ...
Úrsula Vasconcelos Abecassis   +4 more
doaj   +4 more sources

Modelling of Phase Contrast Imaging with X-ray Wavefront Sensor and Partial Coherence Beams [PDF]

open access: goldSensors, 2020
The Hartmann wavefront sensor is able to measure, separately and in absolute, the real δ and imaginary part β of the X-ray refractive index. While combined with tomographic setup, the Hartman sensor opens many interesting opportunities behind the direct ...
Ginevra Begani Provinciali   +3 more
doaj   +4 more sources

Wavefront sensor-less adaptive optics using deep reinforcement learning. [PDF]

open access: yesBiomed Opt Express, 2021
Image degradation due to wavefront aberrations can be corrected with adaptive optics (AO). In a typical AO configuration, the aberrations are measured directly using a Shack-Hartmann wavefront sensor and corrected with a deformable mirror in order to ...
Durech E   +3 more
europepmc   +2 more sources

Simulation-based design optimization of the holographic wavefront sensor in closed-loop adaptive optics

open access: yesLight: Advanced Manufacturing, 2022
Adaptive optics systems are used to compensate for wavefront distortions introduced by atmospheric turbulence. The distortions are corrected by an adaptable device, normally a deformable mirror.
Andreas Zepp   +3 more
doaj   +2 more sources

Shack-Hartmann wavefront sensor optical dynamic range. [PDF]

open access: yesOpt Express, 2021
The widely used lenslet-bound definition of the Shack-Hartmann wavefront sensor (SHWS) dynamic range is based on the permanent association between groups of pixels and individual lenslets. Here, we formalize an alternative definition that we term optical
Akondi V, Dubra A.
europepmc   +2 more sources

Retinal adaptive optics imaging with a pyramid wavefront sensor. [PDF]

open access: yesBiomed Opt Express, 2021
The pyramid wavefront sensor (P-WFS) has replaced the Shack-Hartmann (SH-) WFS as the sensor of choice for high-performance adaptive optics (AO) systems in astronomy.
Brunner E   +8 more
europepmc   +2 more sources

Accuracy characterization of Shack–Hartmann sensor with residual error removal in spherical wavefront calibration

open access: yesLight: Advanced Manufacturing, 2023
The widely used Shack–Hartmann wavefront sensor (SHWFS) is a wavefront measurement system. Its measurement accuracy is limited by the reference wavefront used for calibration and also by various residual errors of the sensor itself.
Yi He   +5 more
doaj   +2 more sources

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