Results 31 to 40 of about 5,559 (209)
Wide-Aperture Bimorph Deformable Mirror for Beam Focusing in 4.2 PW Ti:Sa Laser
Applied Sciences, 2022 The bimorph deformable mirror with a diameter of 320 mm, including 127 control electrodes, has been developed and tested. The flatness of the initial mirror surface of about 1 μm (P-V) was achieved by mechanically adjusting the mirror substrate fixed in ...
Vadim Samarkin +7 more
doaj +1 more source
Simplifying the detection of optical distortions by machine learning [PDF]
Journal of Innovative Optical Health Sciences, 2020 Adaptive optics has been widely used in biological science to recover high-resolution optical image deep into the tissue, where optical distortion detection with high speed and accuracy is strongly required.
Shuwen Hu +4 more
doaj +1 more source
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
Wavefront aberrations in aging measured with Hartmann-Shack at 3- and 5-mm pupil sizes. [PDF]
Optom Vis SciSIGNIFICANCE Visual acuity (VA) depends on many factors. When the goal is to assess retinal health rather than performance, then using a 3‐mm pupil reduces unwanted wavefront aberrations. The axis of astigmatism can still potentially change with age.
Clark CA, Parimi V, Elsner AE.
europepmc +2 more sources
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
Shack-Hartmann wavefront sensor with large dynamic range [PDF]
Journal of Biomedical Optics, 2010 A new spot centroid detection algorithm for a Shack-Hartmann wavefront sensor (SHWFS) is experimentally investigated. The algorithm is a kind of dynamic tracking algorithm that tracks and calculates the corresponding spot centroid of the current spot map based on the spot centroid of the previous spot map, according to the strong correlation of the ...
Mingliang, Xia +5 more
openaire +2 more sources
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
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