A Method Used to Improve the Dynamic Range of Shack–Hartmann Wavefront Sensor in Presence of Large Aberration [PDF]
Sensors, 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 ...
Jianli Wang
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Shack-Hartmann wavefront sensor optical dynamic range. [PDF]
Opt 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.
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Wavefront sensor-less adaptive optics using deep reinforcement learning. [PDF]
Biomed 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
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Retinal adaptive optics imaging with a pyramid wavefront sensor. [PDF]
Biomed 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
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Scanning Wavefront Sensor for Measurement of Highly Divergent Wavefronts
IFAC-PapersOnLine, 2019 This paper deals with the characterization of freeform optics by means of a wavefront sensor. Freeform optics show an increasing demand since they have the potential to improve optical system performance while reducing size, weight and complexity.
Martin Fuerst, Georg Schitter
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An all-photonic focal-plane wavefront sensor. [PDF]
Nat Commun, 2020 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.
Norris BRM +4 more
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Meta Shack-Hartmann wavefront sensor with large sampling density and large angular field of view: phase imaging of complex objects. [PDF]
Light Sci ApplShack–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.
Go GH +5 more
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Sub-Millisecond Phase Retrieval for Phase-Diversity Wavefront Sensor. [PDF]
Sensors (Basel), 2020 We propose a convolutional neural network (CNN) based method, namely phase diversity convolutional neural network (PD-CNN) for the speed acceleration of phase-diversity wavefront sensing.
Wu Y, Guo Y, Bao H, Rao C.
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Accounting for focal shift in the Shack-Hartmann wavefront sensor. [PDF]
Opt Lett, 2019 The Shack–Hartmann wavefront sensor samples a beam of light using an array of lenslets, each of which creates an image onto a pixelated sensor. These images translate from their nominal position by a distance proportional to the average wavefront slope ...
Akondi V, Dubra A.
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Centroid error due to non-uniform lenslet illumination in the Shack-Hartmann wavefront sensor. [PDF]
Opt Lett, 2019 Images formed by individual Shack-Hartmann wavefront sensor lenslets are displaced proportionally to the average wavefront slope over their aperture. This principle fails when the lenslet illumination is non-uniform.
Akondi V, Steven S, Dubra A.
europepmc +2 more sources