Results 21 to 30 of about 2,392,408 (295)

Simulation Analysis of a Wavefront Reconstruction of a Large Aperture Laser Beam

Sensors, 2023
In order to solve the problem of atmospheric influence on the far-field measurement of the quality of a laser beam, we proposed a direct wavefront measurement system based on the Hartmann detection principle, which can measure large apertures and high ...
Gangyu Wang, Zaihong Hou, Laian Qin, Xu Jing, Yi Wu   +4 more
doaj   +1 more source

'Shack-Hartmann Wavefront Sensor based on an Industrial Smart Camera

, 2012
Wavefront sensing is important in many optical measurement systems and adaptive optics. The speed of the wavefront sensor determines the achievable temporal resolution of dynamic measurements and the bandwidth of adaptive optics systems.
Paris, René, Thier, Markus, Schitter, Georg, Thurner, Thomas   +3 more
core   +4 more sources

On the acceleration of wavefront applications using distributed many-core architectures [PDF]

, 2011
In this paper we investigate the use of distributed graphics processing unit (GPU)-based architectures to accelerate pipelined wavefront applications—a ubiquitous class of parallel algorithms used for the solution of a number of scientific and ...
Jarvis, S. A.; id_orcid, Pennycook, Simon J., S. J. Pennycook, Mudalige, Gihan R., G. R. Mudalige, Jarvis, Stephen A., S. D. Hammond, Wright, Steven A., Pennycook, S. J., Jarvis, S. A., Hammond, Simon D., S. A. Wright, Hammond, S. D., S. A. Jarvis, Mudalige, G. R., Wright, S. A.   +15 more
core   +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

Simultaneous quantification of longitudinal and transverse ocular chromatic aberrations with Hartmann–Shack wavefront sensor [PDF]

Journal of Innovative Optical Health Sciences, 2018
A simple method to objectively and simultaneously measure eye’s longitudinal and transverse chromatic aberrations was proposed. A dual-wavelength wavefront measurement system using two Hartmann–Shack wavefront sensors was developed. The wavefronts of the
Yangchun Deng, Junlei Zhao, Yun Dai, Yudong Zhang   +3 more
doaj   +1 more source

Quantitative X-ray Channel-Cut Crystal Diffraction Wavefront Metrology Using the Speckle Scanning Technique

Sensors, 2020
A speckle-based method for the X-ray crystal diffraction wavefront measurement is implemented, and the slope errors of channel-cut crystals with different surface characteristics are measured.
Lian Xue, Hongxin Luo, Qianshun Diao, Fugui Yang, Jie Wang, Zhongliang Li   +5 more
doaj   +1 more source

Deep Tissue Wavefront Estimation for Sensorless Aberration Correction

MATEC Web of Conferences, 2015
The multiple light scattering in biological tissues limits the measurement depth for traditional wavefront sensor. The attenuated ballistic light and the background noise caused by the diffuse light give low signal to noise ratio for wavefront ...
Ibrahimovic Emina, Taoa Xiaodong, Reinig Marc, Li Qinggele, Kubby Joel   +4 more
doaj   +1 more source

Interferometric Wavefront Sensing System Based on Deep Learning

Applied Sciences, 2020
At present, most wavefront sensing methods analyze the wavefront aberration from light intensity images taken in dark environments. However, in general conditions, these methods are limited due to the interference of various external light sources.
Yuhao Niu, Zhan Gao, Chenjia Gao, Jieming Zhao, Xu Wang   +4 more
doaj   +1 more source

Double-edge scan wavefront metrology and its application in crystal diffraction wavefront measurements

Journal of Synchrotron Radiation
Achieving diffraction-limited performance in fourth-generation synchrotron radiation sources demands monochromator crystals that can preserve the wavefront across an unprecedented extensive range.
Fang Liu, Ming Li, Qianshun Diao, Zhe Li, Zhibang Shen, Fan Li, Zhen Hong, Hongkai Lian, Shuaipeng Yue, Qingyan Hou, Changrui Zhang, Dongni Zhang, Congcong Li, Fugui Yang, Junliang Yang   +14 more
doaj   +1 more source

Wavefront-sensing with a thin diffuser

, 2017
We propose and implement a broadband, compact, and low-cost wavefront sensing scheme by simply placing a thin diffuser in the close vicinity of a camera. The local wavefront gradient is determined from the local translation of the speckle pattern.
Pascal Berto (1919980), Hervé Rigneault (2482108), Marc Guillon (4180657)   +2 more
core   +1 more source