Compressive Shack-Hartmann Wavefront Sensor based on Deep Neural Networks [PDF]
, 2020 The Shack-Hartmann wavefront sensor is widely used to measure aberrations induced by atmospheric turbulence in adaptive optics systems. However if there exists strong atmospheric turbulence or the brightness of guide stars is low, the accuracy of wavefront measurements will be affected.
arxiv +1 more source
Space-variant Shack-Hartmann wavefront sensing based on affine transformation estimation [PDF]
Applied Optics, 2022, 2022 The space-variant wavefront reconstruction problem inherently exists in deep tissue imaging. In this paper,we propose a framework of Shack-Hartmann wavefront space-variant sensing with extended source illumination. The space-variant wavefront is modeled as a four-dimensional function where two dimensionsare in the spatial domain and two in the Fourier ...
arxiv +1 more source
Single conjugate adaptive optics for the ELT instrument METIS [PDF]
, 2018 The ELT is a 39m large, ground-based optical and near- to mid-infrared telescope under construction in the Chilean Atacama desert. Operation is planned to start around the middle of the next decade.
Absil, Olivier +9 more
core +3 more sources
Beam wavefront retrieval by convoluted spatial spectral benchmark
Matter and Radiation at Extremes, 2021 We propose a method for retrieving a beam wavefront from its near-field intensity distribution after a 4f system by simply inserting a benchmark at the Fourier plane.
Xuewei Deng +5 more
doaj +1 more source
Shack Hartmann wavefront sensor with array of phase coded masks [PDF]
, 2021 Shack-Hartmann wavefront sensors (SHWS) are generally used to measure the wavefront curvature of light beams. Measurement accuracy and the sensitivity of these sensors are important factors for better wavefront sensing. In this study, we demonstrate a new type of SHWS with better measurement accuracy than the regular SHWS.
arxiv +1 more source
Non-common Path Aberration Correction in an Adaptive Optics Scanning Ophthalmoscope [PDF]
, 2014 The correction of non-common path aberrations (NCPAs) between the imaging and wavefront sensing channel in a confocal scanning adaptive optics ophthalmoscope is demonstrated.
Dubra, Alfredo, Sulai, Yusufu N.
core +2 more sources
Telescope to Observe Planetary Systems (TOPS): a high throughput 1.2-m visible telescope with a small inner working angle [PDF]
, 2006 The Telescope to Observe Planetary Systems (TOPS) is a proposed space mission to image in the visible (0.4-0.9 micron) planetary systems of nearby stars simultaneously in 16 spectral bands (resolution R~20). For the ~10 most favorable stars, it will have
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core +2 more sources
Joint optimization of wavefront sensing and reconstruction with automatic differentiation [PDF]
arXiv, 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. Here, we propose to numerically optimize Fourier-filtering wavefront sensors using automatic differentiation.
arxiv
Multiple Spatial Frequencies Pyramid WaveFront Sensing [PDF]
, 2017 A modification of the pyramid wavefront sensor is described. In this conceptually new class of devices, the perturbations are split at the level of the focal plane depending upon their spatial frequencies, and then measured separately.
Bergomi, Maria +13 more
core +1 more source
Assessing the growth kinetics and stoichiometry of Escherichia coli at the single‐cell level
Engineering in Life Sciences, Volume 23, Issue 1, January 2023., 2023 Abstract Microfluidic cultivation and single‐cell analysis are inherent parts of modern microbial biotechnology and microbiology. However, implementing biochemical engineering principles based on the kinetics and stoichiometry of growth in microscopic spaces remained unattained.
Katharina Smaluch +5 more
wiley +1 more source