Results 51 to 60 of about 96,711 (321)
Wavefront sensing using diffractive elements [PDF]
Optics Letters, 2012 In this Letter, we introduce a wavefront slope sensor based on a diffractive element. The diffractive element wavefront sensor (DEWS) produces four double overlapping copies of the incoming wavefront acting like a combination of shearing and pyramidal sensors. The DEWS allows a simple and fast slope estimate.
Pérez Cagigal, Manuel +1 more
openaire +4 more sources
Adaptive Optics Methods to Rat Eye Properties: Impact of Pupil Diameter on Wavefront Detection
PhotonicsAchieving a high-quality wavefront sensing light spot and accurate wavefront estimation of the rat eye is still challenging due to its large ocular aberrations and the back reflections from fundus multilayer.
Wen Kong +3 more
doaj +1 more source
High Sensitivity Wavefront Sensing with a non-linear Curvature Wavefront Sensor [PDF]
, 2009 A new wavefront sensing approach, derived from the successful curvature wavefront sensing concept but using a non-linear phase retrieval wavefront reconstruction scheme, is described. The non-linear curvature wavefront sensor (nlCWFS) approaches the theoretical sensitivity limit imposed by fundamental physics by taking full advantage of wavefront ...
arxiv +1 more source
Wavefront sensing of atmospheric phase distortions at the Palomar 200-in. telescope and implications for adaptive optics [PDF]
, 1997 Major efforts in astronomical instrumentation are now being made to apply the techniques of adaptive optics to the correction of phase distortions induced by the turbulent atmosphere and by quasi-static aberrations in telescopes themselves.
Bloemhof, E. E. +2 more
core +1 more source
Multiple spatial frequencies wavefront sensing [PDF]
Proceedings of the Adaptive Optics for Extremely Large Telescopes 5, 2017 We describe the concept of splitting spatial frequency perturbations into some kind of pupil planes wavefront sensors. Further to the existing approach of dropping higher spatial frequency to suppress aliasing effects (the so-called spatial filtered Shack-Hartmann), we point out that spatial frequencies splitting and mixing of these in a proper manner,
Magrin, Demetrio +12 more
openaire +4 more sources
IEEE Photonics Journal, 2016 We describe a sequential operation approach for a three-sided pyramid wavefront sensor (PWFS) based on a micromirror array with hexagonal geometry. The geometrical optics analysis and numerical simulations show that a linear relationship exists between ...
Lu Chen +6 more
doaj +1 more source
Interferometric Wavefront Sensing System Based on Deep Learning
Applied Sciences, 2020 At present, most wavefront sensing methods analyze the wavefront aberration from light intensity images taken in dark environments. However, in general conditions, these methods are limited due to the interference of various external light sources.
Yuhao Niu +4 more
doaj +1 more source
Deep learning wavefront sensing
Optics Express, 2019 We present a new class of wavefront sensors by extending their design space based on machine learning. This approach simplifies both the optical hardware and image processing in wavefront sensing. We experimentally demonstrated a variety of image-based wavefront sensing architectures that can directly estimate Zernike coefficients of aberrated ...
Yohei Nishizaki +6 more
openaire +3 more sources
Single-Shot Wavefront Sensing in Focal Plane Imaging Using Transformer Networks
OpticsWavefront sensing is an essential technique in optical imaging, adaptive optics, and atmospheric turbulence correction. Traditional wavefront reconstruction methods, including the Gerchberg–Saxton (GS) algorithm and phase diversity (PD) techniques, are ...
Hangning Kou +6 more
doaj +1 more source
Accounting for Polychromatic Light in Virtual Shack-Hartmann Wavefront Sensing
Photonic Sensors, 2023 Virtual Shack-Hartmann wavefront sensing (vSHWS) has some significant advantages and is promising for aberration measurement in the field of biomedical optical imaging.
Xian Yue +5 more
doaj +1 more source