Results 31 to 40 of about 2,392,408 (295)

Research on Optical Metrology for Complex Optical Surfaces with Focal Plane Wavefront Sensing

Micromachines, 2023
Complex optical elements have the advantages of improving image quality and optical performance and expanding the field of view. Therefore, it is widely used in X-ray scientific devices, adaptive optical elements, high-energy laser systems, and other ...
Xinxue Ma, Jianli Wang, Bin Wang, Xinyue Liu, Yuqiang Chen   +4 more
doaj   +1 more source

Wavefront-Guided and Wavefront-Optimised Laser Treatments

, 2012
Optical aberrations of the eye are the errors of the optical system that limit the resolution, contrast and amount of detail in the image formed on the retina. Wavefront technology allows us to measure these optical aberrations, calculate mathematically,
Canan Aslı Utine, YILDIRIM, CANAN ASLI
core   +1 more source

Symmetry‐Guided Multifunctional Acoustic System Based on Mechanically Actuated Sonic Crystals

Advanced Engineering Materials, EarlyView.
This study presents the design, simulation, and experimental validation of amultifunctional acoustic metamaterial based on rotationally engineered sonic crystals.By tuning cylinder orientations, controllable band gaps and six distinct functionalities—including switching, topological insulation, beam splitting, and logic operations—areachieved ...
Yuanyan Zhao, Sriram Subramanian, Gianluca Memoli   +2 more
wiley   +1 more source

Experimental Investigation of Pixelated Instantaneous Phase-Shifting Interferometry Using Liquid Crystal Spatial Light Modulator

Photonics
A pixelated instantaneous phase-shifting interferometry (PSI) using a phase-only liquid crystal spatial light modulator (LC-SLM) is developed and experimentally validated.
Fuzhong Bai, Zhiwen Zhao, Jiayi Chen, Xiaojuan Gao, Yubo Chang, Jianxin Wang, Jixiang Cai   +6 more
doaj   +1 more source

Field Deviation in Radiated Emission Measurement in Anechoic Chamber for Frequencies up to 60 GHz and Deep Learning-Based Correction

International Journal of Antennas and Propagation, 2022
The measurement of radiated emission (RE) in an anechoic chamber becomes very challenging at high frequencies, up to 60 GHz, because the scanning plane of the receiver is in measurement standard deviation from the actual wavefront.
Feng Shi, Liping Yan, Xuping Yang, Xiang Zhao, Richard Xian-Ke Gao   +4 more
doaj   +1 more source

Enhanced Ultrasound Transmission Through Aberration Layers Using Space‐Coiling Acoustic Metamaterials

Advanced Engineering Materials, EarlyView.
Enhancing ultrasound transmission through an aberration layer exhibiting mismatched impedance with the surrounding medium possesses great implications in imaging and treatment. In this study, we show that a space‐coiling acoustic metamaterial with judiciously tailored structural profile can help improve impedance matching.
Maral Ghanami, Hengzhe Ren, Erqian Dong, Ashkan Ghanbarzadeh‐Dagheyan, Chen Shen   +4 more
wiley   +1 more source

Accuracy characterization of Shack–Hartmann sensor with residual error removal in spherical wavefront calibration

Light: Advanced Manufacturing
The widely used Shack–Hartmann wavefront sensor (SHWFS) is a wavefront measurement system. Its measurement accuracy is limited by the reference wavefront used for calibration and also by various residual errors of the sensor itself.
Yi He, Mingdi Bao, Yiwei Chen, Hong Ye, Jinyu Fan, Guohua Shi   +5 more
doaj   +1 more source

Parallelising wavefront applications on general-purpose GPU devices [PDF]

, 2010
Pipelined wavefront applications form a large portion of the high performance scientific computing workloads at supercomputing centres. This paper investigates the viability of graphics processing units (GPUs) for the acceleration of these codes, using ...
Pennycook, Simon J., Mudalige, Gihan R., Hammond, Simon D., Jarvis, Stephen A.   +3 more
core  

From Photoalignment to Structured Light: Liquid Crystal Platforms for Beam Shaping and Complex Wavefronts

Advanced Functional Materials, EarlyView.
Photoaligned and photopatterned liquid crystal platforms provide programmable control of optical phase, polarization, and spin‐orbit interactions, enabling compact generation of structured light and complex wavefronts. This review highlights how tailored molecular orientations transform simple beams into designed optical fields, opening versatile ...
Le Zhou, Tingjun Zhong, Sijie Liu, Pouya Nosratkhah, Ke Xu, Yuzhen Zhao, Kristiaan Neyts   +6 more
wiley   +1 more source

Accuracy Analysis of Measuring Cylindrical Surfaces with Complex Parameters Using Two-Dimensional Pseudo Lateral Shearing Interferometry

Photonics
Cylindrical surfaces with complex parameters (CSCP), including off-axis, aspheric, and other properties, constitute fundamental components within complex optical systems.
Le Zhao, Zhongming Zang, Siqi Zhang, Yang Chen, Yueqing Zheng, Zhitian Niu, Jing Yu, Weizhou Luo, Zhu Li, Ming Kong, Shiling Wang, Kuo Hai   +11 more
doaj   +1 more source