Results 131 to 140 of about 2,399,560 (322)

Meta Shack–Hartmann wavefront sensor with large sampling density and large angular field of view: phase imaging of complex objects

Light: Science & Applications
Shack–Hartmann wavefront sensors measure the local slopes of an incoming wavefront based on the displacement of focal spots created by a lenslet array, serving as key components for adaptive optics for astronomical and biomedical imaging.
Gi-Hyun Go, Dong-gu Lee, Jaeyeon Oh, Gookho Song, Doeon Lee, Mooseok Jang   +5 more
doaj   +1 more source

Adaptive Optics for Extremely Large Telescopes

, 2019
Adaptive Optics has become a key technology for the largest ground-based telescopes currently under or close to begin of construction. Adaptive optics is an indispensable component and has basically only one task, that is to operate the telescope at its ...
Hippler, Stefan
core   +1 more source

A Periodic Error Correction Method for Terahertz Coded‐Aperture Imaging

Advanced Intelligent Systems, EarlyView.
A physics‐constrained unsupervised learning framework with periodic error correction is proposed for terahertz coded‐aperture imaging. The method improves reconstruction robustness against noise and model mismatch, while reducing reliance on large‐scale labeled data.
Hongxu Wu, Jiangtao Ji, Chenxi Liu, Fei Yang, Shuang Peng, Haiying Lu, Junwei Wu, Xiaojian Fu, Huifeng Ma   +8 more
wiley   +1 more source

Design considerations for wavefront sensing with self-referencing interferometers in adaptive optics systems

Journal of the European Optical Society-Rapid Publications
In this work, we show the design and implementation of wavefront sensing with a self-referencing interferometer (SRI). The SRI is developed to aid adaptive optics (AO) control, via deformable mirrors, in correcting wavefront error from atmospheric ...
MacGillivray Alexander C., Hristovski Ilija R., Jenne Matthias F., Reeves Andrew P., Mata Calvo Ramon, Holzman Jonathan F.   +5 more
doaj   +1 more source

Recovering pyramid WS gain in non-common path aberration correction mode via deformable lens

, 2017
It is by now well known that pyramid based wavefront sensors, once in closed loop, have the capability to improve more and more the gain as the reference natural star image size is getting smaller on the pyramid pin. Especially in extreme adaptive optics
Bergomi, M., Bonora, S., Chinellato, S., Favazza, P., Magrin, D., Quintavalla, M., Ragazzoni, R., Umbriaco, G.   +7 more
core   +1 more source

Design of Compact Liquid Crystal on Silicon Projection Optics Utilizing a Common Freeform Optical Path for Augmented Reality Displays

Advanced Intelligent Systems, EarlyView.
This study presents a compact freeform projection optics using dual wedge prisms for waveguide displays. Unlike previous designs that separate illumination and imaging paths, a freeform optical path integrates both. The system achieves a 32º field of view, 37.5 pixels per degree, and a total volume of less than 2 cm3.
Ximeng Wang, Dewen Cheng, Yuefan Shan, Da Wang, Tong Yang, Yongtian Wang   +5 more
wiley   +1 more source

ShaneAO: wide science spectrum adaptive optics system for the Lick Observatory

, 2014
A new high-order adaptive optics system is now being commissioned at the Lick Observatory Shane 3-meter telescope in California. This system uses a high return efficiency sodium beacon and a combination of low and high-order deformable mirrors to achieve
Cabak, Jerry, Deich, William, Dillon, Daren, Gates, John, Gavel, Donald, Kupke, Renate, Lanclos, Kyle, McGurk, Rosalie, Norton, Andrew, Peck, Michael, Pfister, Terry, Phillips, Andrew, Ratliff, Chris, Rockosi, Connie, Saylor, Michael, Srinath, Srikar, Ward, Jim   +16 more
core   +1 more source

Gaze‐Engineered 3D Augmented Reality

Advanced Intelligent Systems, EarlyView.
Augmented Reality (AR) systems serve as a critical interface bridging users with the metaverse. This study explores the application of human factors engineering in metaverse development, specifically investigating the integration of eye‐tracking technology to enhance AR display performance.
Naiqin Zhao, Jiasheng Xiao, Runze Zhu, Hao Zhang   +3 more
wiley   +1 more source

Graphics processing unit (GPU) aided wavefront-based autofocusing in microscopy

AIP Advances, 2018
Based on the wavefront sensing and propagation, the wavefront-based autofocus approach is proposed for potentially adopted in rapid autofocusing since it can precisely locate the focal plane but only requiring much fewer multi-focal image captures ...
Zhilong Jiang, Yan Kong, Fei Liu, Cheng Liu, Shouyu Wang   +4 more
doaj   +1 more source

Polarization dOTF: on-sky focal plane wavefront sensing

, 2016
The differential Optical Transfer Function (dOTF) is a focal plane wavefront sensing method that uses a diversity in the pupil plane to generate two different focal plane images.
Brooks, Keira J., Catala, Laure, Codona, Johanan L., Crawford, Steven M., Kenworthy, Matthew A.   +4 more
core   +1 more source