Results 251 to 260 of about 6,356 (304)
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Hybrid wavefront sensor for the fast detection of wavefront disturbances
Applied Optics, 2012Strongly aberrated wavefronts lead to inaccuracies and nonlinearities in holography-based modal wavefront sensing (HMWS). In this contribution, a low-resolution Shack-Hartmann sensor (LRSHS) is incorporated into HMWS via a compact holographic design to extend the dynamic range of HMWS.
Shihao, Dong +2 more
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Quantum Electronics, 2020
Abstract A brief historical review of the first designs of holographic wavefront sensors (WFS’s) and the concepts lying in their basis is presented. The main directions in the development of these sensors are highlighted and considered.
V.Yu. Venediktov +5 more
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Abstract A brief historical review of the first designs of holographic wavefront sensors (WFS’s) and the concepts lying in their basis is presented. The main directions in the development of these sensors are highlighted and considered.
V.Yu. Venediktov +5 more
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Miniaturized wavefront sensors for MOAO
Adaptive Optics: Analysis and Methods/Computational Optical Sensing and Imaging/Information Photonics/Signal Recovery and Synthesis Topical Meetings on CD-ROM, 2007The original concept of multi-object AO requires wavefront sensors laying in the focal plane of telescopes. Our approach is based on a miniaturized Shack-Hartmann head including fibers transporting light from the focal plane towards detection.
Chemla, Fanny +4 more
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Fourier wavefront reconstruction with a pyramid wavefront sensor
Adaptive Optics Systems VI, 2018Using Fourier methods to reconstruct the phase measured by a wavefront sensor (WFS) can significantly re- duce the number of computations required, as well as easily enable predictive reconstruction methods based on knowledge of the adaptive optics system, atmospheric turbulence and wind profile. Previous work on Fourier re- construction has focused on
Bond, Charlotte +5 more
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Multiscale optimization of the geometric wavefront sensor
Applied Optics, 2021Since wavefront distortions cannot be directly measured from an image, a wavefront sensor (WFS) can use intensity variations from a point source to estimate slope or curvature of a wavefront. However, processing of measured aberration data from WFSs is computationally intensive, and this is a challenge for real-time image restoration or correction.
Saloni Pal +3 more
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SPIE Proceedings, 2005
In this talk we will present a new zonal wavefront sensor. The device consists of a multiplexed hologram which can reconstruct multiple diffracted beams to an image plane with the input of a single object beam. In operation, a wavefront incident on the hologram is divided up into various output beams according to the presence and strength of particular
Geoff Andersen, Randy Reibel
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In this talk we will present a new zonal wavefront sensor. The device consists of a multiplexed hologram which can reconstruct multiple diffracted beams to an image plane with the input of a single object beam. In operation, a wavefront incident on the hologram is divided up into various output beams according to the presence and strength of particular
Geoff Andersen, Randy Reibel
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SPIE Proceedings, 2003
The method of reconstruction of wavefront modes such as the Hartmann one is considered. Complete data about modes using magnification of number of measured numerical performances of the image created by each of them, not using magnification of number of the subapertures is offered.
Gennadii Degtyarev +3 more
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The method of reconstruction of wavefront modes such as the Hartmann one is considered. Complete data about modes using magnification of number of measured numerical performances of the image created by each of them, not using magnification of number of the subapertures is offered.
Gennadii Degtyarev +3 more
openaire +1 more source
Automatic Wavefront Error Sensor
Applied Optics, 1973The automatic wavefront error sensor has been developed for determining the wavefront error of an optical system. The instrument, which provides a null test for a parabola, measures the ray intercept error and automatically converts this to a wavefront error. Both the ray fan plot and the wavefront error curve are plotted simultaneously.
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Journal of Refractive Surgery, 2006
ABSTRACT PURPOSE: A novel wavefront sensor has been developed. It follows the same principle of the Shack-Hartmann wavefront sensor in that it is based on slope information. However, it has a different symmetry, which may offer benefits in terms of application.
Luis Alberto, Carvalho +3 more
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ABSTRACT PURPOSE: A novel wavefront sensor has been developed. It follows the same principle of the Shack-Hartmann wavefront sensor in that it is based on slope information. However, it has a different symmetry, which may offer benefits in terms of application.
Luis Alberto, Carvalho +3 more
openaire +2 more sources