Results 51 to 60 of about 5,505 (209)

Turbulent parameters at different heights in the atmosphere. Shack–Hartmann wavefront sensor data

Solar-Terrestrial Physics, 2022
The paper presents the results of studies of wavefront distortions at different heights in the atmosphere. We have used measurement wavefront data to determine optical turbulence parameters along the line of sight of the Large Solar Vacuum Telescope ...
Shikhovtsev A. Y., Kiselev A. V., Kovadlo P. G., Kolobov D. Y., Russkikh I. V., Tomin V. E   +5 more
doaj   +1 more source

Retinal Peripheral Defocus and Peripheral Refractive Measurement Techniques: A Review

Journal of Ophthalmology, Volume 2026, Issue 1, 2026.
The theory of retinal peripheral defocus currently represents the prevailing paradigm for myopia prevention and control. Research studies on peripheral refraction indicate that peripheral defocus is significantly associated with the management and progression of myopia.
Lei Chang, Tao Jin, Karuna Sharma
wiley   +1 more source

Parafoveal and Perifoveal Accommodation Response to Defocus Changes Induced by a Tunable Lens

Applied Sciences, 2023
The accommodative response of the human eye is predominantly driven by foveal vision, but reacts also to off-foveal stimuli. Here, we report on monocular accommodation measurements using parafoveal and perifoveal annular stimuli centered around the fovea
Najnin Sharmin, Petros Papadogiannis, Dmitry Romashchenko, Linda Lundström, Brian Vohnsen   +4 more
doaj   +1 more source

Holographic imaging with a Shack-Hartmann wavefront sensor

Optics Express, 2016
A high-resolution Shack-Hartmann wavefront sensor has been used for coherent holographic imaging, by computer reconstruction and propagation of the complex field in a lensless imaging setup. The resolution of the images obtained with the experimental data is in a good agreement with the diffraction theory. Although a proper calibration with a reference
Hai Gong, Oleg Soloviev, Dean Wilding, Paolo Pozzi, Michel Verhaegen, Gleb Vdovin   +5 more
openaire   +2 more sources

Traceable calibration of Shack–Hartmann wavefront sensors employing spherical wavefronts [PDF]

Optical Engineering, 2020
Traceable, highly accurate calibration of wavefront sensors such as Shack–Hartmann sensors is a challenging task and an active field of research. We have developed a measurement system for the traceable calibration of wavefront sensors employing spherical wavefronts and a point light source in combination with a three-axis linear stage.
Johannes Bautsch, Markus Schake, Gerd Ehret, Ulrich Berg, Lorenz Wagner, Johannes Pfund, Rainer Tutsch   +6 more
openaire   +1 more source

Evaluation of Corneal Irregular Astigmatism and Visual Quality Following Bilateral Sequential SMILE and LASEK: A Six‐Year Comparative Study

Journal of Ophthalmology, Volume 2026, Issue 1, 2026.
Purpose To compare the corneal spherical component (SC), regular astigmatism (RA), irregular astigmatism (IA, including asymmetry and irregularity), and visual quality 6 years after small incision lenticule extraction (SMILE) and laser subepithelial keratomileusis (LASEK) for mild‐to‐moderate myopia.
Hua Li, Weinan Hu, Min Li, Yuehui Shi, Lina Sun, Xiaoyun Ma, Jun Zou, Shengjie Li   +7 more
wiley   +1 more source

An Optical Wavefront Sensor Based on a Double Layer Microlens Array

Sensors, 2011
In order to determine light aberrations, Shack-Hartmann optical wavefront sensors make use of microlens arrays (MLA) to divide the incident light into small parts and focus them onto image planes.
Hsiang-Chun Wei, Guo-Dung John Su, Hsin-Ta Hsieh, Vinna Lin   +3 more
doaj   +1 more source

A direct comparison between a MEMS deformable mirror and a liquid crystal spatial light modulator in signal-based wavefront sensing [PDF]

Journal of the European Optical Society-Rapid Publications, 2013
Aberrations degrade the performance of optical systems in terms of resolution and signal-to-noise ratio. This work explores the feasibility of a signal-based wavefront sensor, which employs a search algorithm to estimate Zernike coefficients of given ...
Jewel A. R., Akondi V., Vohnsen B.
doaj   +1 more source

Single-atom trapping in holographic 2D arrays of microtraps with arbitrary geometries

, 2014
We demonstrate single-atom trapping in two-dimensional arrays of microtraps with arbitrary geometries. We generate the arrays using a Spatial Light Modulator (SLM), with which we imprint an appropriate phase pattern on an optical dipole trap beam prior ...
Barredo, Daniel, Browaeys, Antoine, Béguin, Lucas, Labuhn, Henning, Lahaye, Thierry, Nogrette, Florence, Ravets, Sylvain, Vernier, Aline   +7 more
core   +5 more sources

Wavefront subaperture stitching with Shack-Hartmann sensor [PDF]

SPIE Proceedings, 2015
A new approach for large field of view measurement using the Shack-Hartmann wavefront sensor (SHWS) is proposed. The object to be measured is divided into several subaperture units. Each unit is measured using the SHWS and a new algorithm is applied to stitch these units.
Li, Hongru, Feng, Guoying, Sun, Jianfei, Bourgade, Thomas, Zhou, Shouhuan, Asundi, Anand   +5 more
openaire   +2 more sources