Results 31 to 40 of about 5,509 (162)
Optical measurements of phase steps in segmented mirrors - fundamental precision limits [PDF]
, 2006 Phase steps are an important type of wavefront aberrations generated by large telescopes with segmented mirrors. In a closed-loop correction cycle these phase steps have to be measured with the highest possible precision using natural reference stars ...
Caianiello ER +6 more
core +1 more source
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 +4 more
doaj +1 more source
Wavefront image sensor chip [PDF]
, 2010 We report the implementation of an image sensor chip, termed wavefront image sensor chip (WIS), that can measure both intensity/amplitude and phase front variations of a light wave separately and quantitatively.
Cui, Xiquan +3 more
core +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
Robust control of a bimorph mirror for adaptive optics system [PDF]
, 2008 We apply robust control technics to an adaptive optics system including a dynamic model of the deformable mirror. The dynamic model of the mirror is a modification of the usual plate equation. We propose also a state-space approach to model the turbulent
Arzelier, Denis +3 more
core +3 more sources
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 +3 more
doaj +1 more source
Detection of phase singularities with a Shack-Hartmann wavefront sensor
, 2006 While adaptive optical systems are able to remove moderate wavefront distortions in scintillated optical beams, phase singularities that appear in strongly scintillated beams can severely degrade the performance of such an adaptive optical system ...
Aksenov +19 more
core +1 more source
, 2018 We present a multi-conjugate adaptive optics (MCAO) system simulator bench, HeNOS (Herzberg NFIRAOS Optical Simulator). HeNOS is developed to validate the performance of the MCAO system for the Thirty Meter Telescope, as well as to demonstrate techniques
Andersen, David +7 more
core +1 more source
Accuracy of Shack-Hartmann wavefront sensor using a coherent wound fibre image bundle
, 2018 Shack-Hartmann wavefront sensors using wound fibre bundles are desired for multi-object adaptive optical systems to provide large multiplex positioned by Starbugs.
Goodwin, Michael +2 more
core +1 more source
Results from the GMT Ground-Layer Experiment at the Magellan Telescopes [PDF]
, 2006 We present results from our two year study of ground-layer turbulence as seen through the 6.5-meter Magellan Telescopes at Las Campanas Observatory. The experiment consists of multiple, moderate resolution, Shack-Hartmann wavefront sensors deployed over ...
Athey, A. +3 more
core +3 more sources