Results 51 to 60 of about 2,674,389 (338)
Focal plane wavefront sensing using machine learning: performance of convolutional neural networks compared to fundamental limits [PDF]
, 2021 Focal plane wavefront sensing (FPWFS) is appealing for several reasons. Notably, it offers high sensitivity and does not suffer from non-common path aberrations (NCPA).
G. O. D. Xivry +4 more
semanticscholar +1 more source
PhotoniX, 2022 Adaptive optics (AO) is a powerful tool for optical microscopy to counteract the effects of optical aberrations and improve the imaging performance in biological tissues.
Zhou Zhou +8 more
semanticscholar +1 more source
Advanced wavefront sensing and control demonstration with MagAO-X [PDF]
Astronomical Telescopes + Instrumentation, 2022 The search for exoplanets is pushing adaptive optics systems on ground-based telescopes to their limits. Currently, we are limited by two sources of noise: the temporal control error and non-common path aberrations.
S. Haffert +15 more
semanticscholar +1 more source
Optics Express, 2022 In astronomy and related fields there is a pressing need to efficiently inject light, transmitted through the atmosphere, into a single-mode fibre. However this is extremely difficult due to the large, rapidly changing aberrations imprinted on the light ...
B. Norris +5 more
semanticscholar +1 more source
Terahertz referenceless wavefront sensing by means of computational shear-interferometry.
Optics Express, 2022 In this contribution, we demonstrate the first referenceless measurement of a THz wavefront by means of shear-interferometry. The technique makes use of a transmissive Ronchi phase grating to generate the shear.
M. Agour +5 more
semanticscholar +1 more source
Joint optimization of wavefront sensing and reconstruction with automatic differentiation [PDF]
Astronomical Telescopes + Instrumentation, 2022 High-contrast imaging instruments need extreme wavefront control to directly image exoplanets. This requires highly sensitive wavefront sensors which optimally make use of the available photons to sense the wavefront.
Rico Landman +5 more
semanticscholar +1 more source
Surface Measurement Using Compressed Wavefront Sensing
Photonic Sensors, 2018 Compressed sensing leverages the sparsity of signals to reduce the amount of measurements required for its reconstruction. The Shack-Hartmann wavefront sensor meanwhile is a flexible sensor where its sensitivity and dynamic range can be adjusted based on
Eddy Mun Tik Chow +3 more
doaj +1 more source
Non-modulated pyramid wavefront sensor. Use in sensing and correcting atmospheric turbulence [PDF]
Astronomy & Astrophysics, 2023 Context. The diffusion of adaptive optics systems in astronomical instrumentation for large ground-based telescopes is rapidly increasing and the pyramid wavefront sensor is replacing the Shack-Hartmann as the standard solution for single conjugate ...
G. Agapito +4 more
semanticscholar +1 more source
A Tip–Tilt and Piston Detection Approach for Segmented Telescopes
Photonics, 2020 Accurate segmented mirror wavefront sensing and control is essential for next-generation large aperture telescope system design. In this paper, a direct tip–tilt and piston error detection technique based on model-based phase retrieval with multiple ...
Shun Qin, Wai Kin Chan
doaj +1 more source
Wavefront sensing with critical sampling [PDF]
Optics Letters, 2011 Different types of nonredundant sampling patterns are shown to guarantee completeness of the basis formed by the sampled partial derivatives of Zernike polynomials, commonly used to reconstruct the wavefront from its slopes (wavefront sensing). In the ideal noise-free case, this enables one to recover double the number of modes J than sampling points I
Navarro, Rafael +2 more
openaire +3 more sources