Results 71 to 80 of about 2,243,893 (300)
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
Terahertz wavefront measurement with a Hartmann sensor
, 2012 The measurement of the wavefront of a terahertz (THz) beam is essential for the development of any optical instrument operating at THz frequencies. We have realized a Hartmann wavefront sensor for the THz frequency range.
Grahn, Holger-T. +17 more
core +1 more source
Advanced Science, EarlyView.A protocol of fs‐laser‐induced periodic phase‐transition of 2D‐MoTe2 template, inducing AuNPs@1T’‐MoTe2 nanograting, is developed. The labeled AuNPs@1T’‐MoTe2 substrate conjugated with specialized immunoglobulin G demonstrates an unexpectedly high discrimination accuracy close to unity for serological diagnosis of rheumatoid arthritis by frequency ...
Yao Yao +9 more
wiley +1 more source
Fourier transform-wavefront reconstruction for the pyramid wavefront sensor [PDF]
1st AO4ELT conference - Adaptive Optics for Extremely Large Telescopes, 2010 The application of Fourier-transform reconstruction techniques to the pyramid wavefront sensor has been investigated. A preliminary study based on end-to-end simulations of an adaptive optics system with ≈40x40 subapertures and actuators shows that the performance of the Fourier-transform reconstructor (FTR) is of the same order of magnitude than the ...
Quirós-Pacheco, Fernando +2 more
openaire +2 more sources
Micro-machined membrane deformable mirrors for cryogenic adaptive optics [PDF]
, 2002 In this Thesis, the suitability of 37 actuator Micro-machined membrane deformable mirrors (MMDM) for adaptive optics at cryogenic temperatures is evaluated. A method is described to safely cool MMDMs to 78K. The initial surface figures of three MMDMs are
Dyson, H.M., Dyson, Harold Michael
core
Ultra‐Wide‐Field Noninvasive Imaging Through Scattering Media Via Physics‐Guided Deep Learning
Advanced Science, EarlyView.We propose a physics‐guided adaptive dual‐domain learning method for ultra‐wide‐field noninvasive imaging through scattering media, namely UNI‐Net. Our method not only reduces the requirement for real experimental data by an order of magnitude but also enables clear imaging of complex scenes with an ultra‐large field of view, which is 164 times the OME
Lintao Peng +5 more
wiley +1 more source
A Digital Prism-based Wavefront Sensor Testbench [PDF]
, 2019 In this paper, we present a simulation framework for a digital prism-based wavefront sensor. In simulation, we generate a digital prism wavefront sensor (3-sided, 4-sided and cone) and compute the linearity of the 3-sided digital prism wavefront sensor
Weddell S, Clare R, Engler B
core
Wavefront Line‐Scan Imaging Via a Single‐Pixel Detector
Advanced Science, EarlyView.We propose and demonstrate a wavefront line‐scan imaging paradigm that integrates 1D spatial light modulation with single‐pixel detection. Benefiting from 1D modulation, not only is the imaging speed improved, but also the storage of modulation patterns is reduced by several orders of magnitude.
Nuo Liu +4 more
wiley +1 more source
A telescope-ready approach for modal compensation of pyramid wavefront sensor optical gain
Astronomy & Astrophysics, 2019 The pyramid wavefront sensor (PWFS) is the currently preferred design for high-sensitivity adaptive optics (AO) systems for extremely large telescopes (ELTs).
V. Deo +7 more
semanticscholar +1 more source
Efficient, nonlinear phase estimation with the nonmodulated pyramid wavefront sensor. [PDF]
Journal of The Optical Society of America A-optics Image Science and Vision, 2018 The sensitivity of the pyramid wavefront sensor (PyWFS) has made it a popular choice for astronomical adaptive optics (AAO) systems. The PyWFS is at its most sensitive when it is used without modulation of the input beam. In nonmodulated mode, the device
R. Frazin
semanticscholar +1 more source