TurbulenceApplications ranging from lidar to free-space laser communications to directed energy require ever-better ways to overcome the distortions of a churning atmosphere. Emerging wavefront-sensing technologies are stepping up to the challenge.Abbie T. WatnikDennis F. Gardner...
Adaptive optics (AO) are typically added to these systems to decrease atmospheric channel losses; however, the performance of traditional AO wavefront sensors degrades in long-range, deep turbulence conditions. Alternative wavefront sensors using phase diversity can successfully reconstruct wavefronts in...
F. Wavefront sensing in deep turbulence. Opt. Photonics News 29, 38 (2018). Article ADS Google Scholar Platt, B. C. & Shack, R. History and principles of shack-hartmann wavefront sensing. J. Refract. Surg. 17, S573–S577 (2001). Article Google Scholar Ragazzoni, R., Diolaiti,...
We present the focal instrumentation set up on the 2-m telescope at Pic du Midi, France developed to achieve third order aberration corrections on turbulence-degraded images using a photon-counting detector, a wavefront sensor, and a deconvolution method. This instrument is called DIVAS for visibl...
Turbulence is a complex and chaotic state of fluid motion. Atmospheric turbulence within the Earth’s atmosphere poses fundamental challenges for applications such as remote sensing, free-space optical communications and astronomical observation due to its rapid evolution across temporal and spatial scales...
2015-03-21上传 大气湍流三维波前探测模式层析算法分析 Analysis of modal tomography for three-dimensional wavefront sensing of atmosphere turbulence 文档格式: .pdf 文档大小: 343.16K 文档页数: 7页 顶/踩数: 0/0 收藏人数: 0 评论次数: 0
featuring a simpler pupil than the ELT. This allowed us to quickly simulate the properties of the petal mode and its measurement by the PyWFS. We studied specifically how a system that separates the atmospheric turbulence from the petal measurement would behave. Studying the petal mode’s power...
A communication system, where data is transmitted in the form of light using optical source like laser over the atmospheric channel, is called as a free space optical (FSO)-based communication system. Due to the presence of atmospheric turbulence also known as wavefront aberration, coupling effici...
Adaptive optics (AO) is critical in astronomy, optical communications and remote sensing to deal with the rapid blurring caused by the Earth’s turbulent atmosphere. But current AO systems are limited by their wavefront sensors, which need to be in an optical plane non-common to the science ...
Deep learningDeep learning neural networks are used for wavefront sensing and aberration correction in atmospheric turbulence without any wavefront sensor (i.e. reconstruction of the wavefront aberration phase from the distorted image of the object). We compared and found the characteristics of the ...