Results 281 to 290 of about 2,071,972 (337)
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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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Compact multireference wavefront sensor design
Optics Letters, 2005We present a compact optical design for a multireference Shack-Hartmann-based wavefront sensor (WFS) for multiconjugate adaptive optical systems. The key component of this WFS design is a field lenslet array that separates the exit pupil images in the sensing plane for all reference sources. An analytical method for WFS optical design is presented, and
Alexander V, Goncharov +2 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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x–y curvature wavefront sensor
Optics Letters, 2015In this Letter, we propose a new curvature wavefront sensor based on the principles of optical differentiation. The theoretically modeled setup consists of a diffractive optical mask placed at the intermediate plane of a classical two-lens coherent optical processor. The resulting image is composed of a number of local derivatives of the entrance pupil
Manuel P, Cagigal, Pedro J, Valle
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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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Wavefront reconstruction using smartphone based wavefront sensors
SPIE Proceedings, 2015Smartphone camera system has the capability of being integrated into powerful field-sensing tools, capturing data and sharing these data with computing servers or cloud experts. The purpose of this work is to implement a wavefront sensor based on the smartphone platform, which has many potential applications in thin-films and bio-related sensing areas.
Zhenyu Yang, Qiwen Zhan
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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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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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Wavefront reconstruction error of Shack-Hartmann wavefront sensors
Publications of the Astronomical Society of the Pacific, 1994We 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 ...
N. Takato, M. Iye, I. Yamaguchi
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Digital holographic wavefront sensor
Imaging and Applied Optics 2015, 2015For free-space laser communications and for tracking of high-speed airborne objects Shack-Hartmann sensor is not effective. Its performance is limited by scintillation. We characterize a promising modal alternative: digital holographic wavefront sensor. The sensor is very robust to scintillation, residual tip/tilt and misalignments.
Marin-Palomo, P., Zepp, A., Gladysz, S.
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