Results 1 to 10 of about 8,969 (258)

X-Ray Single-Grating Interferometry for Wavefront Measurement and Correction of Hard X-Ray Nanofocusing Mirrors [PDF]

Sensors, 2020
X-ray single-grating interferometry was applied to conduct accurate wavefront corrections for hard X-ray nanofocusing mirrors. Systematic errors in the interferometer, originating from a grating, a detector, and alignment errors of the components, were ...
Jumpei Yamada, Takato Inoue, Nami Nakamura, Takashi Kameshima, Kazuto Yamauchi, Satoshi Matsuyama, Makina Yabashi   +6 more
doaj   +2 more sources

Design and Error Analysis of an Optical Measurement System for the Wavefront of Large-Aperture Segmented Mirror [PDF]

Sensors
To better meet the wavefront measurement requirements for large-aperture segmented mirrors after in-orbit deployment, this paper designs a measurement system based on an optical camera and targets.
Yukun He, Hongbo Zhao, Lanxin Peng, Xiaodong Sui, Changzheng Chen, Yueyang Peng   +5 more
doaj   +2 more sources

Wavefront measurement using computational adaptive optics. [PDF]

J Opt Soc Am A Opt Image Sci Vis, 2018
In many optical imaging applications, it is necessary to correct for aberrations to obtain high quality images. Optical coherence tomography (OCT) provides access to the amplitude and phase of the backscattered optical field for three-dimensional (3D) imaging samples. Computational adaptive optics (CAO) modifies the phase of the OCT data in the spatial
South FA, Liu YZ, Bower AJ, Xu Y, Carney PS, Boppart SA.   +5 more
europepmc   +3 more sources

A Compact Dual-Oblique-Fiber Heterodyne Phase-Shifting Point Diffraction Interferometer [PDF]

Sensors
Point diffraction interferometers (PDIs) utilize a near-ideal spherical wavefront generated by point diffraction as the reference, providing a high-quality measurement benchmark independent of reference surface quality.
Yongjie Wang, Conghui Zhu, Wenxi Zhang
doaj   +2 more sources

Scanning Wavefront Sensor for Measurement of Highly Divergent Wavefronts

IFAC-PapersOnLine, 2019
Abstract This paper deals with the characterization of freeform optics by means of a wavefront sensor. Freeform optics show an increasing demand since they have the potential to improve optical system performance while reducing size, weight and complexity.
Martin Fuerst, Georg Schitter
exaly   +2 more sources

Wavefront measurement method based on improved light field camera

Results in Physics, 2020
The light field camera is used in the wavefront sensing field because of its simple structure, large field of view, high utilization rate of light energy, etc.
Xin Chen, Wenke Xie, Haotong Ma, Junqiu Chu, Bo Qi, Ge Ren, Xuecheng Sun, Fanglin Chen   +7 more
doaj   +3 more sources

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   +3 more sources

Simulation Analysis of an Atmospheric Turbulence Wavefront Measurement System

Photonics
In this paper, a turbulent wavefront measurement model based on the Hartmann system structure is proposed. The maximum recognizable mode number of different lens units is discussed, and the influence of different lens array arrangements on the accuracy ...
Gangyu Wang, Laian Qin, Yang Li, Yilun Cheng, Xu Jing, Gongye Chen, Zaihong Hou   +6 more
doaj   +3 more sources

Transmission matrix of a multimode fiber: In-line vs off-axis holography. [PDF]

PLoS ONE
Multimode fibers (MMFs) hold great promise for a variety of imaging applications. However, controlling the complex propagation of light through thousands of modes in MMFs remains a challenging task.
Aleksandra Ivanina, Benjamin Lochocki, Andreas Koglbauer, Sergei Sokolov, Sebastianus A Goorden, Lyubov V Amitonova   +5 more
doaj   +2 more sources

Simulation-based design optimization of the holographic wavefront sensor in closed-loop adaptive optics

Light: Advanced Manufacturing, 2022
Adaptive optics systems are used to compensate for wavefront distortions introduced by atmospheric turbulence. The distortions are corrected by an adaptable device, normally a deformable mirror.
Andreas Zepp, Szymon Gladysz, Karin Stein, Wolfgang Osten   +3 more
doaj   +1 more source