Results 311 to 320 of about 82,170 (356)
Some of the next articles are maybe not open access.
, 2020
It has been demonstrated that metasurfaces have the ability to manipulate the wavefront. However, most multifunctional metasurfaces reported to date only operate in either reflection or transmission mode.
Junpeng Fan, Yongzhi Cheng, B. He
semanticscholar +1 more source
It has been demonstrated that metasurfaces have the ability to manipulate the wavefront. However, most multifunctional metasurfaces reported to date only operate in either reflection or transmission mode.
Junpeng Fan, Yongzhi Cheng, B. He
semanticscholar +1 more source
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.
Wolfgang Osten +2 more
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Wavefront processing of radio-frequency wavefront data
Proceedings of the IEEE, 1984A class of special-purpose processors is described. These processors are for use in holographic imaging systems that utilize electromagnetic waves with radio frequencies. The systems, which operate in very nearly real time, consist of arrays of receiving antennas with a receiver at each antenna.
E.L. Rope +2 more
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Wavefront reconstruction error of Shack-Hartmann wavefront sensors [PDF]
Publications of the Astronomical Society of the Pacific, 1994 We have evaluated the wavefront reconstruction error for Shack-Hartmann wavefront sensors based on a series of simulations for various numbers of subapertures at various levels of measurement error in determining the Hartmann spot centroids. The optimum number of subapertures is derived for a given magnitude reference star in the cases of photon-noise ...
M. Iye, N. Takato, I. Yamaguchi
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, 2017
The control of polarization and wavefront plays an important role in many optical systems. In this work, a monolayer metasurface is proposed to simultaneously realize circular asymmetric transmission (AT) and wavefront shaping based on asymmetric spin ...
Fei Zhang +7 more
semanticscholar +1 more source
The control of polarization and wavefront plays an important role in many optical systems. In this work, a monolayer metasurface is proposed to simultaneously realize circular asymmetric transmission (AT) and wavefront shaping based on asymmetric spin ...
Fei Zhang +7 more
semanticscholar +1 more source
Wavefront scatter and wavefront healing
The Journal of the Acoustical Society of America, 2001While acoustic scattering is essentially a time domain phenomenon, studies of scattering from objects in water, and from boundaries, have often concentrated on time-independent/cw descriptions. There are, however, critical aspects of the scattering problem which become evident only in the time domain.
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Active wavefront sensing and wavefront control with SLMs
SPIE Proceedings, 2004Active systems are becoming more and more prevalent in the the field of optical technology. These systems require not only means of controlling wavefronts but mostly also of sensing wavefronts. This paper shows in four examples how spatial light modulators can be utilized to perform active wavefront sensing and wavefront controlling tasks. The examples
Jan Liesener +3 more
openaire +2 more sources
Applications of wavefront technology
Journal of Cataract and Refractive Surgery, 2012This review of wavefront technology looks at 2 major aspects. The first is the basics and principles of the optics of the eye, how to decompose the wavefront in a more adequate way for interpretation, and how these aberrations affect the visual acuity. It also addresses the diversity and complexity of wavefront sensors; how these devices transform the ...
Marcony R. Santhiago +4 more
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American Journal of Ophthalmology, 2001
A DAPTIVE OPTICS WAS FIRST SUGGESTED IN 1953 BY astronomer Horace Babcock to remove the blurring effects of turbulence in the atmosphere on telescopic images of stars.1 The U.S. Defense Department later invested heavily in the development of adaptive optics technology to improve the effectiveness of laser weapons as part of its Star Wars Program.
Scott MacRae, David R. Williams
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A DAPTIVE OPTICS WAS FIRST SUGGESTED IN 1953 BY astronomer Horace Babcock to remove the blurring effects of turbulence in the atmosphere on telescopic images of stars.1 The U.S. Defense Department later invested heavily in the development of adaptive optics technology to improve the effectiveness of laser weapons as part of its Star Wars Program.
Scott MacRae, David R. Williams
openaire +3 more sources
Machine learning for improved image-based wavefront sensing.
Optics Letters, 2018For large amounts of wavefront error, gradient-based optimization methods for image-based wavefront sensing are unlikely to converge when the starting guess for the wavefront differs greatly from the true wavefront. We use machine learning operating on a
S. Paine, J. Fienup
semanticscholar +1 more source