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An all-photonic focal-plane wavefront sensor [PDF]
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]
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]
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]
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]
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]
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
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
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Shack-Hartmann wavefront sensor optical dynamic range. [PDF]
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]
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
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