Modelling of Phase Contrast Imaging with X-ray Wavefront Sensor and Partial Coherence Beams [PDF]
Sensors, 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
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).
Keller, Christoph U. +4 more
core +7 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
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
Optical wavefront phase-tilt measurement using Si-photonic waveguide grating couplers [PDF]
arXiv, 2023 Silicon photonic wavefront phase-tilt sensors for wavefront monitoring using surface coupling grating arrays are demonstrated. The first design employs the intrinsic angle dependence of the grating coupling efficiency to determine local wavefront tilt ...
Cheben, Pavel +7 more
core +1 more source
Detection of phase singularities with a Shack-Hartmann wavefront sensor [PDF]
, 2006 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 ...
Aksenov +19 more
core +2 more sources
Disturbance Modelling for Minimum Variance Control in Adaptive Optics Systems Using Wavefront Sensor Sampled-Data [PDF]
Sensors, 2021 Modern large telescopes are built based on the effectiveness of adaptive optics systems in mitigating the detrimental effects of wavefront distortions on astronomical images.
María Coronel +3 more
doaj +2 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 ...
Eikema, K. S. E. +4 more
core +3 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 ...
Howell, John C. +2 more
core +4 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