Results 41 to 50 of about 11,638 (169)

Reinforcement Learning Environment for Wavefront Sensorless Adaptive Optics in Single-Mode Fiber Coupled Optical Satellite Communications Downlinks

Photonics, 2023
Optical satellite communications (OSC) downlinks can support much higher bandwidths than radio-frequency channels. However, atmospheric turbulence degrades the optical beam wavefront, leading to reduced data transfer rates.
Payam Parvizi, Runnan Zou, Colin Bellinger, Ross Cheriton, Davide Spinello   +4 more
doaj   +1 more source

Lateral Shearing Interferometry based on a Polarization Grating for Wavefront Sensing [PDF]

한국정밀공학회지, 2022
In this investigation, we propose a simple and effective lateral shearing interferometer based on a polarization grating. In the lateral shearing device, an incident beam is split into two beams by a polarization grating, and the returning beams can be ...
Hyo Bin Jeong, Hyo Mi Park, Ki-Nam Joo
doaj   +1 more source

Wavefront Reconstruction of Shack-Hartmann with Under-Sampling of Sub-Apertures

Photonics, 2023
Shack-Hartmann wavefront sensor plays a key role in adaptive optics (AO) systems, which detect the aberrant wavefront by an array of micro-lenslets across the aperture pupil.
Jian Huang, Lianqun Yao, Shuyun Wu, Gongchang Wang   +3 more
doaj   +1 more source

Adaptive Hartmann–Shack Wavefront Sensor

Photonics
In this work, an adaptive Hartmann–Shack wavefront sensor (AHSS) is proposed, designed, and evaluated. This sensor allows for the modification in the dynamic range of wavefront aberration measurement, defined as the range between the minimum and maximum ...
Jennyfer Morales-Marín, Walter Torres-Sepúlveda, Alejandro Mira-Agudelo   +2 more
doaj   +1 more source

Estimation of atmospheric turbulence parameters from Shack–Hartmann wavefront sensor measurements [PDF]

Monthly notices of the Royal Astronomical Society, 2018
The estimation of atmospheric turbulence parameters is of relevance for: a) site evaluation & characterisation; b) prediction of the point spread function; c) live assessment of error budgets and optimisation of adaptive optics performance; d ...
P. Andrade, P. Garcia, C. Correia, J. Kolb, M. I. Carvalho   +4 more
semanticscholar   +1 more source

Shack-Hartmann wavefront-sensor-based adaptive optics system for multiphoton microscopy. [PDF]

J Biomed Opt, 2010
Cha JW, Ballesta J, So PT.
europepmc   +2 more sources

The diagnostics and laser infrastructure at the Soft X‐ray Port of the European XFEL

Journal of Synchrotron Radiation, EarlyView.
The diagnostics and laser infrastructure of the Soft X‐ray Port (SXP) at the European X‐ray Free Electron Laser are presented.The diagnostics and laser infrastructure of the Soft X‐ray Port (SXP) at the European X‐ray Free Electron Laser are presented.
Patrik Grychtol, Vahagn Vardanyan, Pranav Bhardwaj, Michael Heber, David Doblas-Jimenez, Ekaterina Tikhodeeva, Serguei Molodtsov, Manuel Izquierdo   +7 more
wiley   +1 more source

Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device

Micromachines, 2019
The Hartmann⁻Shack wavefront sensor is widely used to measure aberrations in both astronomy and ophthalmology. Yet, the dynamic range of the sensor is limited by cross-talk between adjacent lenslets.
Alessandra Carmichael Martins, Brian Vohnsen   +1 more
doaj   +1 more source

Small Mirrors for Small Satellites: Design of the Deformable Mirror Demonstration Mission CubeSat (DeMi) Payload

Frontiers in Astronomy and Space Sciences, 2021
The Deformable Mirror Demonstration Mission (DeMi) is a technology demonstration CubeSat to test a 140 actuator micro-electromechanical system (MEMS) deformable mirror in low-Earth orbit.
Ewan S. Douglas, Ewan S. Douglas, Greg Allan, Rachel Morgan, Bobby G. Holden, Jennifer Gubner, Christian Haughwout, Paula do Vale Pereira, Yinzi Xin, Yinzi Xin, John Merk, Kerri L. Cahoy, Kerri L. Cahoy   +12 more
doaj   +1 more source

Full Vectorial Field Sensing Using Liquid Crystal Droplet Arrays

Advanced Materials, Volume 38, Issue 39, 13 July 2026.
An inkjet‐printed liquid crystal droplet array enables compact, low‐cost, single‐shot sensing of the full vectorial light field. Within a single platform, it simultaneously retrieves intensity, polarization, and phase, while dual‐wavelength operation highlights its capability for multi‐wavelength optical field characterization. ABSTRACT Determining the
Xuke Qiu, Jinge Guo, Jiahe Cui, Runchen Zhang, Zimo Zhao, Yifei Ma, Waqas Kamal, Steve J. Elston, Alfonso A. Castrejón‐pita, Stephen M. Morris, Chao He   +10 more
wiley   +1 more source