Results 31 to 40 of about 5,531 (246)

COMPARISON OF HOLOGRAPHIC AND ITERATIVE METHODS FOR AMPLITUDE OBJECT RECONSTRUCTION [PDF]

Научно-технический вестник информационных технологий, механики и оптики, 2015
Experimental comparison of four methods for the wavefront reconstruction is presented. We considered two iterative and two holographic methods with different mathematical models and algorithms for recovery.
I. A. Shevkunov, N. V. Petrov
doaj   +1 more source

Wavefront reconstruction by modal decomposition

Optics Express, 2012
We propose a new method to determine the wavefront of a laser beam based on modal decomposition by computer-generated holograms. The hologram is encoded with a transmission function suitable for measuring the amplitudes and phases of the modes in real-time. This yields the complete information about the optical field, from which the Poynting vector and
Christian, Schulze, Darryl, Naidoo, Daniel, Flamm, Oliver A, Schmidt, Andrew, Forbes, Michael, Duparré   +5 more
openaire   +2 more sources

Impact of CMOS Pixel and Electronic Circuitry in the Performance of a Hartmann-Shack Wavefront Sensor

Sensors, 2018
This work presents a numerical simulation of a Hartmann-Shack wavefront sensor (WFS) that assesses the impact of integrated electronic circuitry on the sensor performance, by evaluating a full detection chain encompassing wavefront sampling ...
Úrsula Vasconcelos Abecassis, Davies William de Lima Monteiro, Luciana Pedrosa Salles, Carlos Augusto de Moraes Cruz, Pablo Nunes Agra Belmonte   +4 more
doaj   +1 more source

Study on Aberration Correction of Adaptive Optics Based on Convolutional Neural Network

Photonics, 2021
The existence of aberrations has always been an important limiting factor in the imaging field. Especially in optical microscopy imaging, the accumulated aberration of the optical system and the biological samples distorts the wavefront on the focal ...
Jin Li, Luwei Wang, Yong Guo, Yangrui Huang, Zhigang Yang, Wei Yan, Junle Qu   +6 more
doaj   +1 more source

Joint optimization of wavefront sensing and reconstruction with automatic differentiation

, 2022
High-contrast imaging instruments need extreme wavefront control to directly image exoplanets. This requires highly sensitive wavefront sensors which optimally make use of the available photons to sense the wavefront.
Rico Landman (14419221), Christoph Keller (6324752), David Doelman (14419230), Emiel H. Por (14419224), Sebastiaan Haffert (14419227), Thijs Stockmans (14419233)   +5 more
core   +1 more source

Long Wave Infrared Wavefront Reconstruction Through Complex Media

, 2022
International audienceA novel broadband infrared (IR) speckle imaging system with a thin scatterer and an uncooled microbolometric camera is employed to encode wavefront phase variations as local speckle deformations.
Krachmalnicoff, Valentina, Bhattacharya, Anwesh, De Wilde, Yannick, Izeddin, Ignacio, Berto, Pascal, Tessier, Gilles   +5 more
core   +1 more source

A mathematical framework for nonlinear wavefront reconstruction in adaptive optics systems with Fourier-type wavefront sensing

, 2023
Advanced adaptive optics (AO) instruments have applications in ophthalmic imaging, free-space optical communications and the future generation of extremely large telescopes.
Victoria Hutterer, Hutterer, Victoria, Andreas Neubauer, Neubauer, Andreas, Julia Shatokhina, Shatokhina, Julia   +5 more
core   +1 more source

Coded wavefront sensor and non-iterative learning-based reconstruction

, 2021
Here we put forward a coded wavefront sensor and neural network framework to achieve wavefront reconstruction.
Wolfgang Heidrich, Wang, Congli, Miao Qi, Congli Wang, Qi, Miao, Heidrich, Wolfgang   +5 more
core   +1 more source

Simulation Analysis of an Atmospheric Turbulence Wavefront Measurement System

Photonics
In this paper, a turbulent wavefront measurement model based on the Hartmann system structure is proposed. The maximum recognizable mode number of different lens units is discussed, and the influence of different lens array arrangements on the accuracy ...
Gangyu Wang, Laian Qin, Yang Li, Yilun Cheng, Xu Jing, Gongye Chen, Zaihong Hou   +6 more
doaj   +1 more source

Wavefront shaping of a Bessel light field enhances light sheet microscopy with scattered light

, 2014
The project was supported by the UK Engineering and Physical Sciences Research Council, RS MacDonald Charitable Trust, SULSA, and the St. Andrews 600th anniversary BRAINS appeal. K. D.
Vettenburg, T.; id_orcid, J. Nylk, K. Dholakia, Nylk, J., C. Mitchell, Vettenburg, T., Gunn-Moore, F. J., T. Vettenburg, Mitchell, C., Dholakia, K., Nylk, J.; id_orcid, F. J. Gunn-Moore   +11 more
core   +1 more source