Results 111 to 120 of about 239,453 (286)
Self-coherent camera as a focal plane wavefront sensor: simulations
, 2009 Direct detection of exoplanets requires high dynamic range imaging. Coronagraphs could be the solution, but their performance in space is limited by wavefront errors (manufacturing errors on optics, temperature variations, etc.), which create quasi ...
Baudoz, Pierre +4 more
core +2 more sources
Coherence Awareness in Diffractive Neural Networks
Laser &Photonics Reviews, EarlyView.It is demonstrated that spatial coherence significantly impacts all‐optical diffractive neural networks, unlike imaging systems. A general framework is proposed for training diffractive networks for any specified degree of spatial and temporal coherence. Coherence‐blind networks are further introduced, which are resilient to illumination changes. These
Matan Kleiner +2 more
wiley +1 more source
Wavefront analysis and phase correctors design using SHADOW
Journal of Synchrotron RadiationKnife-edge imaging is a successful method for determining the wavefront distortion of focusing optics such as Kirkpatrick–Baez mirrors or compound refractive lenses.
Hossein Khosroabadi +3 more
doaj +1 more source
High resolution wavefront correction with photocontrolled deformable mirror
Optics Express, 2012 We demonstrate that a novel actuation scheme, employed in an optical control deformable mirror, can be more convenient than the conventional discrete fixed actuators approach. The Photo-Controlled Deformable Mirror (PCDM) mirror leverages consumer LCD display technology in the wavefront forming control, enabling flexible programmable configuration of ...
S. Bonora +4 more
openaire +6 more sources
, 2005 Numerical simulations of atmospheric turbulence and AO wavefront correction are performed to investigate the timescale for fringe motion in optical interferometers with spatial filters.
Baldwin +8 more
core +1 more source
Laser &Photonics Reviews, EarlyView.This review explores deconvolution techniques in optical coherence tomography (OCT), addressing resolution degradation from point‐spread functions (PSF). It reviews foundational principles (e.g., Richardson‐Lucy deconvolution) to advanced AI‐driven methods, emphasizing clinical translation and interdisciplinary collaboration. Real‐world implementations
Syeda Aimen Abbasi +6 more
wiley +1 more source
Telescopes Alignment Using the Sharpness Function Method Based on Undersampled Images
IEEE Photonics Journal, 2019 In astronomy, the images are sometimes undersampled. In the previous research works, image reconstructions have to be employed to recover the lost information from a set of undersampled images to achieve a high-resolution image using dithering or drizzle
Min Li, Xin Liu, Ang Zhang, Hao Xian
doaj +1 more source
Sensing and control of segmented mirrors with a pyramid wavefront sensor in the presence of spiders
, 2017 The segmentation of the telescope pupil (by spiders & the segmented M4) create areas of phase isolated by the width of the spiders on the wavefront sensor (WFS), breaking the spatial continuity of the wavefront.
Clarke, Fraser +11 more
core +1 more source
Bendable Fiber Lens for Minimally Invasive Endoscopy
Laser &Photonics Reviews, EarlyView.Translating ex vivo imaging to minimally invasive in vivo applications is of outstanding scientific and socioeconomic relevance. 3D imaging based on tiny lensless fiber endoscopes requires complex setups and computational schemes, so far. Bridging this gap, imaging through a unique optical fiber that mimics the functionality of a lens but is minimally ...
Ronja Stephan +10 more
wiley +1 more source
Adaptive particle image velocimetry based on sharpness metrics
Journal of the European Optical Society-Rapid Publications, 2018 Background Optical distortions can significantly deteriorate the measurement accuracy in particle image velocimetry systems. Such distortions can occur at fluctuating phase boundaries during flow measurement and result from the accompanied refractive ...
M. Teich +4 more
doaj +1 more source