Results 41 to 50 of about 2,024,523 (345)
Optics Express, 2010 We report the implementation of an image sensor chip, termed wavefront image sensor chip (WIS), that can measure both intensity/amplitude and phase front variations of a light wave separately and quantitatively. By monitoring the tightly confined transmitted light spots through a circular aperture grid in a high Fresnel number regime, we can measure ...
Cui, Xiquan +3 more
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IEEE Photonics Journal, 2022 Correction performance of an adaptive optics (AO) system is severely limited by its system latency under high temporal frequency distortions. Wavefront prediction methods has been proven to be an effective way to compensate system delay.
Ning Wang +8 more
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Adaptive optics with an infrared pyramid wavefront sensor at Keck
Journal of Astronomical Telescopes Instruments and Systems, 2020 . The study of cold or obscured, red astrophysical sources can significantly benefit from adaptive optics (AO) systems employing infrared (IR) wavefront sensors.
C. Bond +20 more
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Sensors, 2021 Non-uniform intensity distribution of laser near-field beam results in the irregular shape of the spot in the wavefront sensor. The intensity of some sub-aperture spots may be too weak to be detected, and the accuracy of wavefront restoration is ...
Haiqi Lin +3 more
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Modeling classical wavefront sensors
Optics Express, 2020 We present an image formation model for deterministic phase retrieval in propagation-based wavefront sensing, unifying analysis for classical wavefront sensors such as Shack-Hartmann (slopes tracking) and curvature sensors (based on Transport-of-Intensity Equation).
Congli Wang +3 more
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Differential wavefront curvature sensor [PDF]
SPIE Proceedings, 2005 In this paper, a wavefront curvature sensor is presented. This sensor is based on the measurements of the differentials of wavefront slopes, where the wavefront slope measurements can be achieved by a Shack-Hartmann sensor. A Shack-Hartmann sensor with three output collimated beams will be introduced with a lenslet array installed in each beam.
Zou, Weiyao, Rolland, Jannick
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Wavefront Sensing for Evaluation of Extreme Ultraviolet Microscopy
Sensors, 2020 Wavefront analysis is a fast and reliable technique for the alignment and characterization of optics in the visible, but also in the extreme ultraviolet (EUV) and X-ray regions.
Mabel Ruiz-Lopez +7 more
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Fourier transform-wavefront reconstruction for the pyramid wavefront sensor [PDF]
1st AO4ELT conference - Adaptive Optics for Extremely Large Telescopes, 2010 The application of Fourier-transform reconstruction techniques to the pyramid wavefront sensor has been investigated. A preliminary study based on end-to-end simulations of an adaptive optics system with ≈40x40 subapertures and actuators shows that the performance of the Fourier-transform reconstructor (FTR) is of the same order of magnitude than the ...
Quirós-Pacheco, Fernando +2 more
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Centroid-Predicted Deep Neural Network in Shack-Hartmann Sensors
IEEE Photonics Journal, 2022 The Shack-Hartmann wavefront sensor produces incorrect wavefront measurements when some sub-spots are weak and missing. In this paper, a method is proposed to predict the centroids of these sub-spots for the Shack-Hartmann wavefront sensor based on the ...
Mengmeng Zhao +6 more
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Linearity of the pyramid wavefront sensor
Optics Express, 2006 The pyramid wavefront sensor is very similar to the Fourier knife-edge test, but employs dynamic modulation to quantify the phase derivative. For circular modulation, we compare approximate geometrical optics calculations, more exact diffraction calculations, and experimental results.
Christopher Dainty +3 more
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