Results 291 to 300 of about 2,024,523 (345)
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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 R. 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 R. Reibel
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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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B-spline approximation of a wavefront measured by Shack-Hartmann sensor
Optical Engineering + Applications, 2021Conventional Shack-Hartmann sensor uses Zernike polynomials in order to approximate the wavefront of the light. Zernike approximation is well-known, well-established and widely used technique. And in most cases the quality of approximation is good enough,
I. Galaktionov +3 more
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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.
Wolfgang Osten +2 more
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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.
Anatolii V. Makhan'ko +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.
Anatolii V. Makhan'ko +3 more
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Deep learning assisted Shack-Hartmann wavefront sensor for direct wavefront detection.
Optics Letters, 2020The conventional Shack-Hartmann wavefront sensor (SHWS) requires wavefront slope measurements of every micro-lens for wavefront reconstruction. In this Letter, we applied deep learning on the SHWS to directly predict the wavefront distributions without ...
Lejia Hu, Shuwen Hu, W. Gong, Ke Si
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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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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.
Paulo Schor +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.
Paulo Schor +3 more
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Tomographic diffractive microscopy with a wavefront sensor
Optics Letters, 2012Tomographic diffractive microscopy is a recent imaging technique that reconstructs quantitatively the three-dimensional permittivity map of a sample with a resolution better than that of conventional wide-field microscopy. Its main drawbacks lie in the complexity of the setup and in the slowness of the image recording as both the amplitude and the ...
Ruan, Y. +10 more
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