Results 41 to 50 of about 4,053 (141)

X-ray wavefront characterization with two-dimensional wavefront sensors: shearing interferometers and Hartmann wavefront sensors [PDF]

SPIE Proceedings, 2012
Phase reconstructions from a two-dimensional shearing inter- ferometer, based on two orthogonal phase gratings in a single plane, and a Hartmann sensor are compared. Design alternatives for both wavefront sensors are given, and simulated performance of both the two-dimen- sional x-ray shearing interferometer and Hartmann wavefront sensor are presented ...
openaire   +2 more sources

Wavefront Reconstruction of Shack-Hartmann with Under-Sampling of Sub-Apertures

Photonics, 2023
Shack-Hartmann wavefront sensor plays a key role in adaptive optics (AO) systems, which detect the aberrant wavefront by an array of micro-lenslets across the aperture pupil.
Jian Huang, Lianqun Yao, Shuyun Wu, Gongchang Wang   +3 more
doaj   +1 more source

Advanced holographic wavefront sensor [PDF]

SPIE Proceedings, 2017
Optical science and technologies require fast and precise measurements of wavefront curvature. Amount of wavefront measurement methods increased in the last few years. The important part of the modern wavefront sensors are holographic optical elements (HOE). This article shows a possibility of using HOE for generating Zernike aberration modes.
Alina Gorelaya, Mikhail Kovalev, Polina Malinina, Sergey Odinokov, Maksim Soloviev, Alexander Sevryugin, Vladimir Venediktov   +6 more
openaire   +1 more source

Wavefront Sensor for Laser Beams Based on Reweighted Amplitude Flow Algorithm

Applied Sciences
We present a reference-free computational wavefront sensor based on binary amplitude modulation and phase retrieval. The method employs a Digital Micromirror Device as a programmable amplitude modulator and reconstructs the complex optical field from ...
Ondřej Denk, Jan Pilař, Martin Divoký, Miroslav Čech, Tomáš Mocek   +4 more
doaj   +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, J. Grottke, H. Radner, L. Büttner, J. W. Czarske   +4 more
doaj   +1 more source

Defocused Image Deep Learning Designed for Wavefront Reconstruction in Tomographic Pupil Image Sensors

Mathematics, 2020
Mathematical modelling methods have several limitations when addressing complex physics whose calculations require considerable amount of time. This is the case of adaptive optics, a series of techniques used to process and improve the resolution of ...
Sergio Luis Suárez Gómez, Francisco García Riesgo, Carlos González Gutiérrez, Luis Fernando Rodríguez Ramos, Jesús Daniel Santos   +4 more
doaj   +1 more source

Wavefront Derived Refraction and Full Eye Biometry in Pseudophakic Eyes. [PDF]

PLoS ONE, 2016
To assess wavefront derived refraction and full eye biometry including ciliary muscle dimension and full eye axial geometry in pseudophakic eyes using spectral domain OCT equipped with a Shack-Hartmann wavefront sensor.Twenty-eight adult subjects (32 ...
Xinjie Mao, James T Banta, Bilian Ke, Hong Jiang, Jichang He, Che Liu, Jianhua Wang   +6 more
doaj   +1 more source

Pyramid Wavefront Sensor Using a Discrete Modulated Operation Method

IEEE Photonics Journal
The adaptive optics system (AOS) incorporating a modulated pyramid wavefront sensor (PWFS) represents a key area of exploration in current research aimed at enhancing the capabilities of future extremely large astronomical telescopes.
Lu Chen, Kainan Yao, Jianli Wang, Dianbing Chen, Mingda Ge, Zhiqiang Xu, Dongbo Che   +6 more
doaj   +1 more source

Generalised optical differentiation wavefront sensor: a sensitive high dynamic range wavefront sensor

Optics Express, 2016
Current wavefront sensors for high resolution imaging have either a large dynamic range or a high sensitivity. A new kind of wavefront sensor is developed which can have both: the Generalised Optical Differentiation wavefront sensor. This new wavefront sensor is based on the principles of optical differentiation by amplitude filters.
openaire   +3 more sources

Alternative pyramid wavefront sensors [PDF]

Journal of Astronomical Telescopes, Instruments, and Systems, 2017
The feasibility of a lenslet-based pyramid wavefront sensor (L-PWFS) and a double roof prism-based PWFS (DR-PWFS) as alternatives to a classical PWFS are investigated in this work. Traditional PWFSs require shallow angles and strict apex tolerances, making them difficult to manufacture. Lenslet arrays and roof prisms, on the other hand, are both common
Kooten, M.A.M. van., Veran, J.P., Bradley, C.   +2 more
openaire   +2 more sources