Results 111 to 120 of about 4,053 (141)
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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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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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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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MEMS reflective wavefront sensor
SPIE Proceedings, 2007Sandia National Laboratory has constructed several segmented MEMS deformable mirrors that are under investigation for their suitability in Adaptive Optics systems for the Naval Research Laboratory. These mirrors are constructed in a hexagonal array and have been constructed with flat surfaces, or with optical power allowing each mirror to bring its
Jonathan R. Andrews +6 more
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Integrated Optical Wavefront Sensor
SPIE Proceedings, 1985This paper presents a design for an integrated optical wavefront sensor. Light from an aperture is focussed by a lens onto a detector array. The resulting signals can be used to determine the amount of angular tilt of the wavefront. Parameters affecting angular resolution are analyzed. Tilt angles as small as 10 -5 rad are detectable.
H. E. Tomaschke, R. R. Rice
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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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