Results 11 to 20 of about 6,059 (275)

The bright pyramid wavefront sensor [PDF]

Techniques and Instrumentation for Detection of Exoplanets X, 2021
submitted proceedings to SPIE SPIE Optical Engineering + Applications 2021, Techniques and Instrumentation for Detection of Exoplanets ...
Jean-François Sauvage, Jean-François Sauvage, Vincent Chambouleyron, Vincent Chambouleyron, Rebecca Jensen-Clem, Rebecca Jensen-Clem, Benjamin L. Gerard, Benjamin L. Gerard   +7 more
openaire   +3 more sources

Shack–Hartmann Wavefront Sensing Based on Four-Quadrant Binary Phase Modulation

Photonics, 2022
Aiming at the problem that it is difficult for the conventional Shack–Hartmann wavefront sensor to achieve high-precision wavefront reconstruction with low spatial sampling, a kind of Shack–Hartmann wavefront sensing technology based on four-quadrant ...
Mengmeng Zhao, Wang Zhao, Kangjian Yang, Shuai Wang, Ping Yang, Fengjiao Zeng, Lingxi Kong, Chao Yang   +7 more
doaj   +1 more source

Reinforcement Learning Environment for Wavefront Sensorless Adaptive Optics in Single-Mode Fiber Coupled Optical Satellite Communications Downlinks

Photonics, 2023
Optical satellite communications (OSC) downlinks can support much higher bandwidths than radio-frequency channels. However, atmospheric turbulence degrades the optical beam wavefront, leading to reduced data transfer rates.
Payam Parvizi, Runnan Zou, Colin Bellinger, Ross Cheriton, Davide Spinello   +4 more
doaj   +1 more source

Improved Wavefront Reconstruction and Correction Strategy for Adaptive Optics System With a Plenoptic Sensor

IEEE Photonics Journal, 2021
Wavefront reconstruction and correction under strong turbulence has become a crucial issue for adaptive optics systems. An approach using a plenoptic sensor has attracted high attention recently.
Jintian Hu, Tao Chen, Xudong Lin, Liang Wang, Qichang An, Zhichong Wang   +5 more
doaj   +1 more source

Deep and clear optical imaging of thick inhomogeneous samples. [PDF]

PLoS ONE, 2012
Inhomogeneity in thick biological specimens results in poor imaging by light microscopy, which deteriorates as the focal plane moves deeper into the specimen.
Raphael Jorand, Gwénaële Le Corre, Jordi Andilla, Amina Maandhui, Céline Frongia, Valérie Lobjois, Bernard Ducommun, Corinne Lorenzo   +7 more
doaj   +1 more source

CoolMomentum-SPGD Algorithm for Wavefront Sensor-Less Adaptive Optics Systems

Photonics, 2023
Instead of acquiring the previous aberrations of an optical wavefront with a sensor, wavefront sensor-less (WFSless) adaptive optics (AO) systems compensate for wavefront distortion by optimizing the performance metric directly.
Zhiguang Zhang, Yuxiang Luo, Huizhen Yang, Hang Su, Jinlong Liu   +4 more
doaj   +1 more source

Adaptive Optical Closed-Loop Control on the Basis of Hyperparametric Optimization of Convolutional Neural Networks

Applied Sciences, 2023
In adaptive optics systems, the precision wavefront sensor determines the closed-loop correction effect. The accuracy of the wavefront sensor is severely reduced when light energy is weak, while the real-time performance of wavefront sensorless adaptive ...
Bo Chen, Yilin Zhou, Jingjing Jia, Yirui Zhang, Zhaoyi Li   +4 more
doaj   +1 more source

Performance Characterization of Deep-Phase-Retrieval Shack-Hartmann Wavefront Sensors

IEEE Photonics Journal, 2023
Shack-Hartmann wavefront sensor (SHWFS) is the most popular wavefront sensor in adaptive optics systems. The Deep-Phase-Retrieval Wavefront Reconstruction (DPRWR) method, which was proposed by our group previously, is a kind of deep learning-based ...
Manting Zhang, Youming Guo
doaj   +1 more source

All-fibre wavefront sensor

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT We report on a tapered three-core optical fibre that can be used as a tip–tilt wavefront sensor. In this device, a coupled region of a few millimetres at the sensing tip of the fibre converts fragile phase information from an incoming wavefront into robust intensity information within each of the cores. The intensity information
Wright, Thomas A., Yerolatsitis, Stephanos, Harrington, Kerrianne, Harris, Robert J., Birks, Tim A.   +4 more
openaire   +2 more sources

Breaking of Wavelength-Dependence in Holographic Wavefront Sensors Using Spatial-Spectral Filtering

Sensors, 2023
Nowadays, wavefront sensors are widely used to control the shape of the wavefront and detect aberrations of the complex field amplitude in various fields of physics. However, almost all of the existing wavefront sensors work only with quasi-monochromatic
Nikita Stsepuro, Michael Kovalev, Evgenii Zlokazov, Sergey Kudryashov   +3 more
doaj   +1 more source