Results 51 to 60 of about 11,638 (169)

Centroid computation for Shack-Hartmann wavefront sensor in extreme situations based on artificial neural networks.

Optics Express, 2018
This paper proposes a method used to calculate centroid for Shack-Hartmann wavefront sensor (SHWFS) in adaptive optics (AO) systems that suffer from strong environmental light and noise pollutions.
Ziqiang Li, Xinyang Li
semanticscholar   +1 more source

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

Material Modification of Borofloat 33 During Scanning‐Based Microforming Using Femtosecond Laser Pulses

Advanced Optical Materials, Volume 14, Issue 14, 10 April 2026.
Possibilities for ablation‐free microforming of borosilicate glass using ultrashort laser pulses are presented. Depending on the laser parameters and scanning strategy, surface structures with profile heights of up to 20 µm could be produced. The work provides a comprehensive experimental and analytical characterization of the microforming process ...
Marina Skiba, Hagen Peter Kohl, Eric Schadow, Stefan Nolte, Andrés Fabián Lasagni, Jens Bliedtner   +5 more
wiley   +1 more source

Dynamic Retinal Pathology in Glaucoma Progression Revealed by High‐Resolution Functional Imaging In Vivo

Laser &Photonics Reviews, Volume 20, Issue 5, 6 March 2026.
In this work, we investigated the dynamic retinal pathology of glaucoma from onset to late stages through longitudinal in vivo high‐resolution imaging in a silicone oil‐induced ocular hypertension (SOHU) glaucoma mouse model. We developed an optimized adaptive optics two‐photon excitation fluorescence microscopy (AO‐TPEFM) technique for morphological ...
Yiming Fu, Pham Binh Minh, Sicong He, Yingzhu He, Zhongya Qin, Ting Xie, Jianan Qu   +6 more
wiley   +1 more source

Natural Convection of MHD Double Diffusive Nanoencapsulated Phase Change Material (NEPCM) in the Annulus Between Concentric Horizontal Circular and Square Cylinders

International Journal of Energy Research, Volume 2026, Issue 1, 2026.
The investigation focuses on the natural convection of magnetohydrodynamic (MHD) double‐diffusive nanoencapsulated phase change material (NEPCM) in an annulus composed of square and concentric horizontal circular cylinders. The right, upper, and bottom walls of the outer square cylinder are cooled, while the inner circular cylinder is heated. The NEPCM
Md. Mahadul Islam, Md. Mamun Molla, Preetom Nag, Md. Mahbub Alam, Souhail Souai, Suresh Kannan Balasingam   +5 more
wiley   +1 more source

Laboratory study of aberration calculation in underwater turbulence using Shack-Hartmann wavefront sensor and Zernike polynomials.

Optics Express
This paper presents a laboratory study of the aberrations calculation in underwater turbulence using the Shack-Hartmann wavefront sensor. The wavefront decomposition method and Zernike polynomials determine the aberration parameters.
Amir Aghajani, F. Kashani, M. Yousefi
semanticscholar   +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

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

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

Adaptive Shack-Hartmann wavefront sensor accommodating large wavefront variations.

Optics Express, 2018
Shack-Hartmann wavefront sensors (SHWFSs) usually have fixed subaperture areas on the detector, in order to fix the minimum and maximum amounts of wavefront departure, or the dynamic range of measurement.
M. Aftab, Heejoo Choi, Rongguang Liang, Dae Wook Kim   +3 more
semanticscholar   +1 more source