Results 71 to 80 of about 2,674,389 (338)
Wavefront measurement method based on improved light field camera
Results in Physics, 2020 The light field camera is used in the wavefront sensing field because of its simple structure, large field of view, high utilization rate of light energy, etc.
Xin Chen +7 more
doaj +1 more source
Transmission wavefront shearing interferometry for photoelastic materials [PDF]
, 2009 A general analysis and experimental validation of transmission wavefront shearing interferometry for photoelastic materials are presented. These interferometers applied to optically isotropic materials produce a single interference pattern related to one
Bhattacharya, Kaushik +2 more
core +1 more source
Deep learning wavefront sensing for fine phasing of segmented mirrors.
Optics Express, 2021 Segmented primary mirror provides many crucial important advantages for the construction of extra-large space telescopes. The imaging quality of this class of telescope is susceptible to phasing error between primary mirror segments.
Yirui Wang +7 more
semanticscholar +1 more source
Beam wavefront retrieval by convoluted spatial spectral benchmark
Matter and Radiation at Extremes, 2021 We propose a method for retrieving a beam wavefront from its near-field intensity distribution after a 4f system by simply inserting a benchmark at the Fourier plane.
Xuewei Deng +5 more
doaj +1 more source
Calibration and performance evaluation of a monomorph deformable mirror
Results in Optics, 2022 To achieve diffraction-limited performance with a 50 cm solar telescope at the Udaipur solar observatory the development of a high-order adaptive optics (AO) system is currently in progress. The system includes a monomorph deformable mirror (MDM) with 85
A. Raja Bayanna +3 more
doaj +1 more source
A Demonstration of Wavefront Sensing and Mirror Phasing from the Image Domain [PDF]
, 2014 In astronomy and microscopy, distortions in the wavefront affect the dynamic range of a high contrast imaging system. These aberrations are either imposed by a turbulent medium such as the atmosphere, by static or thermal aberrations in the optical path,
Cheetham, Anthony +5 more
core +2 more sources
Wavefront sensing with a thin diffuser [PDF]
Optics Letters, 2017 We propose and implement a broadband, compact, and low-cost wavefront sensing scheme by simply placing a thin diffuser in the close vicinity of a camera. The local wavefront gradient is determined from the local translation of the speckle pattern. The translation vector map is computed thanks to a fast diffeomorphic image registration algorithm and ...
Berto, Pascal +2 more
openaire +3 more sources
Constrained matched filtering for extended dynamic range and improved noise rejection for Shack-Hartmann wavefront sensing [PDF]
, 2008 We recently introduced matched filtering in the context of astronomical Shack-Hartmann wavefront sensing with elongated sodium laser beacons [Appl. Opt. 45, 6568 (2006)].
Ellerbroek, B. L., Gilles, L.
core +1 more source
Optics Express, 2021 The single-shot spatiotemporal characterization of an ultrahigh intensity laser pulse was performed using a multispectral wavefront sensor. For the measurement of the spatio-spectral electric field, a femtosecond laser pulse was spectrally modulated and ...
Yeong Gyu Kim +5 more
semanticscholar +1 more source
Near-infrared wavefront sensing [PDF]
SPIE Proceedings, 2016 We discuss the advantages of wavefront sensing at near-infrared (IR) wavelengths with low-noise detector technologies that have recently become available. In this paper, we consider low order sensing with laser guide star (LGS) adaptive optics (AO) and high order sensing with natural guide star (NGS) AO.
Wizinowich, Peter +10 more
openaire +3 more sources