Detection of phase singularities with a Shack-Hartmann wavefront sensor [PDF]
, 2007 While adaptive optical systems are able to remove moderate wavefront distortions in scintillated optical beams, phase singularities that appear in strongly scintillated beams can severely degrade the performance of such an adaptive optical system ...
Mingzhou Chen +2 more
openalex +3 more sources
Highly Stable Spatio-Temporal Prediction Network of Wavefront Sensor Slopes in Adaptive Optics [PDF]
Sensors, 2023 Adaptive Optics (AO) technology is an effective means to compensate for wavefront distortion, but its inherent delay error will cause the compensation wavefront on the deformable mirror (DM) to lag behind the changes in the distorted wavefront ...
Ning Wang +6 more
doaj +2 more sources
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.
europepmc +2 more sources
The coronagraphic Modal Wavefront Sensor: a hybrid focal-plane sensor for the high-contrast imaging of circumstellar environments [PDF]
, 2016 The raw coronagraphic performance of current high-contrast imaging instruments is limited by the presence of a quasi-static speckle (QSS) background, resulting from instrumental non-common path errors (NCPEs).
Michael J. Wilby +4 more
openalex +4 more sources
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
Using the generalised-optical differentiation wavefront sensor for laser guide star wavefront sensing [PDF]
arXiv, 2020 Laser guide stars (LGS) are used in many adaptive optics systems to extend sky coverage. The most common wavefront sensor used in combination with a LGS is a Shack-Hartmann wavefront sensor (SHWFS). The Shack-Hartmann has a major disadvantage for extended source wavefront sensing because it directly samples the image.
Sebastiaan Y. Haffert +2 more
arxiv +3 more sources
Spectrally resolved single-shot wavefront sensing of broadband high-harmonic sources [PDF]
, 2017 Wavefront sensors are an important tool to characterize coherent beams of extreme ultraviolet radiation. However, conventional Hartmann-type sensors do not allow for independent wavefront characterization of different spectral components that may be present in a beam, which limits their applicability for intrinsically broadband high-harmonic generation
0000-0003-4753-3173 +5 more
arxiv +4 more sources
Compressive Wavefront Sensing with Weak Values [PDF]
, 2014 We demonstrate a wavefront sensor based on the compressive sensing, single-pixel camera. Using a high-resolution spatial light modulator (SLM) as a variable waveplate, we weakly couple an optical field's transverse-position and polarization degrees of freedom.
Howell, John C. +2 more
arxiv +5 more sources
Large dynamic range autorefraction with a low-cost diffuser wavefront sensor. [PDF]
Biomed Opt Express, 2019 Wavefront sensing with a thin diffuser has emerged as a potential low-cost alternative to a lenslet array for aberrometry. Here we show that displacement of caustic patterns can be tracked for estimating wavefront gradient in a diffuser wavefront sensor (
McKay GN, Mahmood F, Durr NJ.
europepmc +3 more sources
, 2019 We consider the mathematical background of the wavefront sensor type that is widely used in Adaptive Optics systems for astronomy, microscopy, and ophthalmology.
Victoria Hutterer +2 more
openalex +3 more sources