Results 61 to 70 of about 21,242 (251)

Wavefront reconstruction with artificial neural networks

Optics Express, 2006
In this work, a new approach, a method using artificial neural networks was applied to reconstruct the wavefront. First, the optimal structure of neural networks was found. Then, the networks were trained on both noise-free and noisy spot patterns.
Hong, Guo, Nina, Korablinova, Qiushi, Ren, Josef, Bille   +3 more
openaire   +2 more sources

Arbitrary Orthogonal Polarization Decomposition and Routing With Complex Amplitude Modulation via Wheel‐of‐Fortune‐Inspired Metasurfaces

Advanced Science, EarlyView.
This work demonstrates a receiver‐transmitter‐integrated metasurface that decomposes an incident wave into orthogonal components and routes them into separate channels. Inspired by a “Wheel‐of‐Fortune” mechanism, it enables independent control over the amplitude, phase, and polarization of the transmitted wave.
Tong Liu, Changhong Dai, Weike Feng, Yanzhao Wang, Wenxin Liu, Wentao Zhang, Chao Tian, Guangwei Hu, He‐Xiu Xu   +8 more
wiley   +1 more source

Deep learning enabled robust wavefront sensing for active beam smoothing with a continuous phase modulator

High Power Laser Science and Engineering
In laser systems requiring a flat-top distribution of beam intensity, beam smoothing is a critical technology for enhancing laser energy deposition onto the focal spot.
Yamin Zheng, Yifan Zhang, Liquan Guo, Pei Li, Zichao Wang, Yongchen Zhuang, Shibing Lin, Qiao Xue, Deen Wang, Lei Huang   +9 more
doaj   +1 more source

Polarization dOTF: on-sky focal plane wavefront sensing

, 2016
The differential Optical Transfer Function (dOTF) is a focal plane wavefront sensing method that uses a diversity in the pupil plane to generate two different focal plane images.
Brooks, Keira J., Catala, Laure, Codona, Johanan L., Crawford, Steven M., Kenworthy, Matthew A.   +4 more
core   +1 more source

Ptychographic reconstruction with wavefront initialization

, 2022
X-ray ptychography is a cutting edge imaging technique providing ultra-high spatial resolutions. In ptychography, phase retrieval, i.e., the recovery of a complex valued signal from intensity-only measurements, is enabled by exploiting a redundancy of information contained in diffraction patterns measured with overlapping illuminations.
Wittwer, Felix, Modregger, Peter
openaire   +2 more sources

Deep Volumetric Super‐Resolution Imaging in Thick Biological Specimens With Sparse Scanning SIM

Advanced Science, EarlyView.
Sparse scanning structured illumination microscopy (SS‐SIM) extends the axial depth in super‐resolution fluorescence imaging by combining rapid laser scanning, pixel‐addressed intensity modulation, and sCMOS camera detection. SS‐SIM yields 1.6× lateral and 1.7× axial resolution gains over wide‐field microscopy and enables imaging through 300–600 µm ...
Sha An, Xuhong Guo, Zhongxia Cai, Yunze Lei, Kai Wen, Hongfei Suo, Xiaoyu Kong, Gerd Ulrich Nienhaus, Peng Gao   +8 more
wiley   +1 more source

Time-sequential Pipelined Imaging with Wavefront Coding and Super Resolution [PDF]

, 2017
Wavefront coding has long offered the prospect of mitigating optical aberrations and extended depth of field, but image quality and noise performance are inevitably reduced. We report on progress in the use of agile encoding and pipelined fusion of image
Bradburn, Downing, Dowski, Muyo, Prasad, Vettenburg, Zammit   +6 more
core   +1 more source

Non‐Invasively Tracking an Arbitrary Deformable Object Through Scattering Media and Around Corners via Speckle Correlations

Advanced Science, EarlyView.
A speckle correlation centroid localization method (SCCLM) is proposed for non‐invasive tracking of an arbitrary deformable object through scattering media and around corners, requiring no prior information. Its effectiveness is demonstrated not only in tracking hidden objects beyond the memory effect region but also in following objects undergoing ...
Aiping Zhai, Wenjing Ji, Yan Wang, Xiyuan Luo, Wenjing Zhao, Dong Wang, Fei Liu   +6 more
wiley   +1 more source

Fast and Highly Accurate Zonal Wavefront Reconstruction from Multi-Directional Slope and Curvature Information Using Subregion Cancelation

Applied Sciences
The wavefront reconstruction is a crucial step in determining the performance of wavefront detection instruments. The wavefront reconstruction algorithm is primarily evaluated in three dimensions: accuracy, speed, and noise immunity.
Shuhao Liu, Hui Zhong, Yanqiu Li, Ke Liu
doaj   +1 more source

Warm-started wavefront reconstruction for adaptive optics [PDF]

Journal of the Optical Society of America A, 2008
Future extreme adaptive optics (ExAO) systems have been suggested with up to 10(5) sensors and actuators. We analyze the computational speed of iterative reconstruction algorithms for such large systems. We compare a total of 15 different scalable methods, including multigrid, preconditioned conjugate-gradient, and several new variants of these ...
Laurent, Lessard, Matthew, West, Douglas, Macmynowski, Sanjay, Lall   +3 more
openaire   +2 more sources