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 +6 more
doaj +2 more sources
Design and Error Analysis of an Optical Measurement System for the Wavefront of Large-Aperture Segmented Mirror [PDF]
SensorsTo 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 +5 more
doaj +2 more sources
A Compact Dual-Oblique-Fiber Heterodyne Phase-Shifting Point Diffraction Interferometer [PDF]
SensorsPoint 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
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 +7 more
doaj +3 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.
Georg Schitter
exaly +2 more sources
Simulation Analysis of an Atmospheric Turbulence Wavefront Measurement System
PhotonicsIn 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 +6 more
doaj +3 more sources
Transmission matrix of a multimode fiber: In-line vs off-axis holography. [PDF]
PLoS ONEMultimode 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 +5 more
doaj +2 more sources
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 +3 more
doaj +1 more source
Filtered Influence Function of Deformable Mirror for Wavefront Correction in Laser Systems
Photonics, 2021 An influence function filtering method (IFFM) is presented to improve the wavefront correction capability in laser systems by curbing the correction performance degradation resulted from the IF measurement noise.
Yamin Zheng +5 more
doaj +1 more source
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
doaj +1 more source