Identification and adaptive control of a high-contrast focal plane wavefront correction system [PDF]
arXiv, 2018 All coronagraphic instruments for exoplanet high-contrast imaging need wavefront correction systems to reject optical aberrations and create sufficiently dark holes. Since the most efficient wavefront correction algorithms (controllers and estimators) are usually model-based, the modeling accuracy of the system influences the ultimate wavefront ...
He Sun +2 more
arxiv +5 more sources
Wavefront correction with image-based interferometric focus sensing in two-photon microscopy [PDF]
NanophotonicsAdaptive optics is a technology that corrects wavefront distortions to enhance image quality. Interferometric focus sensing (IFS), a relatively recently proposed method within the field of adaptive optics, has demonstrated effectiveness in correcting ...
Yang Ruiwen +10 more
doaj +3 more sources
Ground-layer wavefront reconstruction from multiple natural guide stars [PDF]
Astrophys.J.661:1332-1338,2007, 2007 Observational tests of ground layer wavefront recovery have been made in open loop using a constellation of four natural guide stars at the 1.55 m Kuiper telescope in Arizona. Such tests explore the effectiveness of wide-field seeing improvement by correction of low-lying atmospheric turbulence with ground-layer adaptive optics (GLAO).
Athey A. +17 more
arxiv +5 more sources
Adaptive wavefront correction in two-photon microscopy using coherence-gated wavefront sensing [PDF]
Proceedings of the National Academy of Sciences, 2006 The image quality of a two-photon microscope is often degraded by wavefront aberrations induced by the specimen. We demonstrate here that resolution and signal size in two-photon microcopy can be substantially improved, even in living biological specimens, by adaptive wavefront correction based on sensing the wavefront of coherence-gated backscattered ...
Markus Rueckel +2 more
+11 more sources
Automatic Modal Wavefront Estimation and Correction for Optical Aberration [PDF]
IEEE Photonics Journal, 2019 Modal estimation of aberration can quantify the amount of aberration, which plays an important role in optical system optimization, aberration correction, and so on. Here, we propose a simple but effective method to find the modal wavefront of aberration.
Xiaomin Lai +4 more
doaj +2 more sources
Combined hardware and computational optical wavefront correction. [PDF]
Biomed Opt Express, 2018 In many optical imaging applications, it is necessary to overcome aberrations to obtain high-resolution images. Aberration correction can be performed by either physically modifying the optical wavefront using hardware components, or by modifying the wavefront during image reconstruction using computational imaging. Here we address a longstanding issue
South FA +5 more
europepmc +4 more sources
Two-Photon Lensless Micro-endoscopy with in-situ Wavefront Correction [PDF]
, 2018 Multi-core fiber-bundle endoscopes provide a minimally-invasive solution for deep tissue imaging and opto-genetic stimulation, at depths beyond the reach of conventional microscopes. Recently, wavefront-shaping has enabled lensless bundle-based micro-endoscopy by correcting the wavefront distortions induced by core-to-core inhomogeneities.
Uri Weiss, Ori Katz
arxiv +2 more sources
Precise Wavefront Correction with an Unbalanced Nulling Interferometer for Exo-Planet Imaging Coronagraphs [PDF]
, 2008 Very high dynamical range coronagraphs targeting direct exo-planet detection (10^9 - 10^10 contrast) at small angular separation (few lambda/D units) usually require an input wavefront quality on the order of ten thousandths of wavelength RMS. We propose a novel method based on a pre-optics setup that behaves partly as a low-efficiency coronagraph, and
Abe +28 more
arxiv +3 more sources
Improving Focal Photostimulation of Cortical Neurons with Pre-derived Wavefront Correction [PDF]
Frontiers in Cellular Neuroscience, 2017 Recent progress in neuroscience to image and investigate brain function has been made possible by impressive developments in optogenetic and opto-molecular tools.
Vincent R. Daria +6 more
doaj +2 more sources
X-Ray Single-Grating Interferometry for Wavefront Measurement and Correction of Hard X-Ray Nanofocusing Mirrors [PDF]
Sensors, 2020 X-ray single-grating interferometry was applied to conduct accurate wavefront corrections for hard X-ray nanofocusing mirrors. Systematic errors in the interferometer, originating from a grating, a detector, and alignment errors of the components, were ...
Jumpei Yamada +6 more
doaj +2 more sources