Results 1 to 10 of about 5,531 (246)
Spline-based wavefront reconstruction for Shack-Hartmann measurements
, 2018 In the coming decade, a new generation of extremely large-scale ground-based astronomical telescopes will see first light. It is well known that increasing the size of the telescope aperture is only beneficial if the adaptive optics (AO) system, which ...
Brunner, A.E. (author)
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Measurement and Compensation of Laser Beam Wavefront Distortion in Atmospheric Environment
Guangtongxin yanjiuObjectiveFree Space Optical Communication (FSOC) demonstates high confidentiality and reliability. However, atmospheric turbulence can cause beam drift, light intensity fluctuations, and phase jitter, which seriously degrades the communication ...
LI Jing +5 more
doaj
Turbulence characterisation for Astronomical Observatories [PDF]
, 2012 Atmospheric turbulence has two effects in astronomy; (i) the broadening of the point spread function due to phase fluctuations limiting the resolution of imaging and (ii) producing intensity fluctuations known as scintillation.
SHEPHERD, HARRY,WILLIAM +1 more
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Comparison of different wavefront reconstruction methods: With Zernike polynomials
, 2016 The goal of the research is to find out whether it is possible to measure a wavefront qualitatively and quantitatively with Janssen’s recently developed analytical algorithm.
Salverda, Jelle (author)
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Algorithms for Wavefront Reconstruction
, 2005 Knowing the solution to Helmholtz equation in a narrow band, with a width of order wave length around a scatterer, we investigate the possibility to construct the wave fronts predicted by the asymptotic methods Geometrical Optics (GO) and Geometrical Theory of Diffraction (GTD).
openaire +1 more source
Model-based wavefront reconstruction approaches for pyramid wavefront sensors in Adaptive Optics
, 2018 Aufgrund von atmosphärischen Turbulenzen und Lichtbrechung sind Bilder von Himmelskörpern, die mit erdgebundenen Teleskopen aufgenommen werden, verschwommen.
Hutterer, Victoria
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Filtering & Identification for Spline based Wavefront Reconstruction in Adaptive Optics
, 2014 Without any form of compensation, atmospheric turbulence blurs the images obtained by ground-based telescopes. An Adaptive Optics (AO) system compensates for the optical wavefront distortions introduced in a light beam as it propagates through a ...
De Gelder, E. (author)
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Distributed Wavefront Reconstruction for Adaptive Optics Systems
, 2014 We are currently facing an increasing amount of challenges in the area of photonics as more and more applications in need for active “photon control” sprout in different fields of science.
Lopes e Silva, J. (author)
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WAVEFRONT SENSING BY HETERODYNE SHEARING INTERFEROMETRY (WAVEFRONT RECONSTRUCTION).
, 1986 The operation of a grating lateral shear heterodyne interferometer as a wavefront sensor for atmospherically perturbed wavefronts is analyzed. A novel wavefront sensor design is given and its feasibility is proven by laboratory experiments.
FREISCHLAD, KLAUS REINHARD.
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Context. To directly image Earth-like planets, contrast levels of 10−8−10−10 are required. The next generation of instruments will need wavefront control below the nanometer level to achieve these goals. The Zernike wavefront sensor (ZWFS) is a promising
P. J. de Visser +5 more
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