Article
Optics
Nikolaus Berlakovich, Ernst Csencsics, Martin Fuerst, Georg Schitter
Summary: The algorithm presented in this paper can accurately register multiple wavefront segments, suitable for freeform wavefronts, with higher registration precision.
Article
Materials Science, Multidisciplinary
Yan Liang, Tianfei Zhu, Xinling Du, Jinliang Xu, Shuwei Fan, Hongxing Wang
Summary: A microlens array on a diamond for Shack Hartmann sensor was successfully fabricated using thermal reflow and dry etch technique. The diamond microlens array exhibited good uniformity, surface smoothness, and had the potential to work under harsh conditions.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Physics, Multidisciplinary
Yanrong Yang, Linhai Huang, Yawei Xiao, Naiting Gu
Summary: This paper proposes a new polarized SHWFS (p-SHWFS) based on the principle of polarization imaging, which uses the difference of state of polarization (SoP) between signal and stray light to improve image contrast. The p-SHWFS is composed of a micro-lens array and a linear polarization camera, which can analyze the degree of linear polarization (DoLP) and angle of linear polarization (AoLP) for the incident wavefront. Numerical simulation and practical experiments validate the feasibility and accuracy improvement of the p-SHWFS.
FRONTIERS IN PHYSICS
(2023)
Article
Optics
You Li, Junyong Zhang, Yaling Yang, Yanli Zhang
Summary: SHWS is a traditional method with simple structure, good usability, real-time monitoring and wide waveband. The introduction of self-interference Taiji lens is aimed to improve the precision of wavefront sensing, with experiments to verify its validity.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Yi Zheng, Mu Yang, Zheng-Hao Liu, Jin-Shi Xu, Chuan-Feng Li, Guang-Can Guo
Summary: In this work, we demonstrate the capability of the Shack-Hartmann wavefront sensor to detect weak values of transverse momentum, extending its input states to partially coherent states and comparing it with the weak measurement wavefront sensor. Our findings have important applications in fundamental quantum physics and quantum metrology.
Article
Optics
Jing Wang, Xiaokun Wang, Lirong Peng, Jincheng Wang, Zhongkai Liu, Lingzhong Li, Mengxue Cai, Bin Liu, Wenhan Li, Xuejun Zhang
Summary: A non-null testing method utilizing Shack-Hartmann wavefront sensor is proposed to measure freeform surfaces, which improves measurement accuracy and dynamic range. A mathematical model and algorithm are developed to calculate the corresponding relationship between sampling points and spots, and experimental results demonstrate the feasibility and measurement capabilities of the method.
Article
Optics
Jing Wang, Xiaokun Wang, Lirong Peng, Jincheng Wang, Zhongkai Liu, Lingzhong Li, Mengxue Cai, Bin Liu, Wenhan Li, Xuejun Zhang
Summary: A non-null testing method utilizing a Shack-Hartmann wavefront sensor is proposed for measuring freeform surfaces. By establishing a mathematical model and algorithm, the dynamic range and measurement accuracy can be improved. Experimental results demonstrate the feasibility and measurement capabilities of this method.
Article
Optics
Yongfeng Zhang, Shengqian Wang, Hao Xian, Changhui Rao
Summary: A novel method based on matrix product is proposed in this Letter for calibrating the Shack-Hartmann wavefront sensor, which demonstrates superior accuracy and efficiency compared to traditional methods.
Article
Optics
Biswa R. Swain, Christophe Dorrer, Jie Qiao
Summary: An Optical Differentiation Wavefront Sensor based on a telephoto lens system and binary pixelated filters is reported in this study, which can measure wavefronts with accuracy better than lambda/10 Root Mean Squared (RMS) at lambda=633 nm. The system shows a high tolerance to components alignment errors in experimental investigation.
Article
Chemistry, Multidisciplinary
Bo Chen, Jingjing Jia, Yilin Zhou, Yirui Zhang, Zhaoyi Li
Summary: This paper proposes a novel subaperture image preprocessing method to improve the signal-to-noise ratio in an extended scene Shack-Hartmann wavefront sensor and enhance the accuracy of offset estimation and slope measurement.
APPLIED SCIENCES-BASEL
(2023)
Article
Computer Science, Information Systems
Fanpeng Kong, Manuel Cegarra Polo, Andrew Lambert
Summary: We propose a fast and reconfigurable architecture for Shack-Hartmann wavefront sensing implemented on FPGA devices, which uses a stream-based center of gravity for spot displacement measurement. This method avoids the common trade-off between noise and bias errors and dynamic range caused by window size. It achieves high accuracy even when the spot moves across the sub-aperture boundary, resulting in an increased dynamic range. This architecture enables real-time wavefront sensing with low latency and high measurement accuracy on low-cost FPGA devices, making it a promising solution for multiple target objects and moderate scintillation conditions.
Article
Engineering, Electrical & Electronic
Yu-Hsiang Lin, Jia-Hong Jian, Jia-Han Li
Summary: The study proposes using the Shack-Hartmann wavefront sensor system to measure the refractive index of hydrogel materials, finding that the P407-DA hydrogel is suitable for designing corneal samples and its refractive index is similar to elasmobranch corneas. This non-contact, minimally invasive, and time-efficient method can guide the development of better biocompatible materials for artificial cornea.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Optics
Fan Feng, Chen Liang, Dongdong Chen, Ke Du, Runjia Yang, Chang Lu, Shumin Chen, Wenting He, Pingyong Xu, Liangyi Chen, Louis Tao, Heng Mao
Summary: This article presents an approach for space-variant Shack-Hartmann wavefront reconstruction based on image moment theory. The relation between the moment of a pair of subimages and the local transformation coefficients is derived, and a special solution is obtained using the square guide 'star'. Our moment-based wavefront reconstruction has reduced computational complexity compared to the iteration-based algorithm. Image restorations using both the tiling strategy with 5 x 5 PSFs and the conventional strategy with a global average PSF are executed. Our approach is supported by visual and quantitative evaluations.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Xian Yue, Yaliang Yang, Fei Xiao, Hao Dai, Chao Geng, Yudong Zhang
Summary: In this study, the data processing procedure and methods of Virtual Shack-Hartmann wavefront sensing (vSHWS) were demonstrated, and the parameters were optimized to achieve the best performance, significantly improving its anti-noise performance.
Article
Optics
Zhentao Zhang, Tim Morris, Nazim Bharmal, Yonghui Liang
Summary: A new self-referencing method using the cell image of PlWFS as a correlation reference has been proposed for simultaneous measurement of high-order aberrations and tilt. Simulations confirm the feasibility of the method and show improved AO performance compared to existing techniques. This method allows stable wavefront tilt control with small residual variance.
