Results 41 to 50 of about 43,714 (202)

Micropipette aspiration as a tool for single‐particle X‐ray imaging and diffraction

Journal of Synchrotron Radiation, Volume 30, Issue 4, Page 788-795, July 2023., 2023
Micropipette aspiration has been combined with a windowless hydrated sample environment for single‐particle X‐ray analysis. A water droplet serves as a `chamber', covered by a mineral oil to prevent evaporation. In the droplet, particles can be aspirated and manipulated by one or two micropipettes.
Hendrik Bruns, Hannes Hoeppe, Ewen Bellec, Steven Leake, Markus Osterhoff, Tim Salditt   +5 more
wiley   +1 more source

Higher order aberrations and retinal image quality during short‐term accommodation in myopic and non‐myopic children

Ophthalmic and Physiological Optics, Volume 43, Issue 4, Page 827-841, July 2023., 2023
Abstract Introduction Despite the known associations between near work and myopia, and retinal image quality and eye growth, accommodation‐induced changes in higher order aberrations (HOA's) and retinal image quality in children with different refractive errors are poorly understood.
Rohan P J Hughes, Scott A Read, Michael J Collins, Stephen J Vincent   +3 more
wiley   +1 more source

Changes in visual function and optical and tear film quality in computer users

Ophthalmic and Physiological Optics, Volume 43, Issue 4, Page 885-897, July 2023., 2023
Abstract Purpose To assess changes in visual function and optical and tear film quality in computer users. Methods Forty computer workers and 40 controls were evaluated at the beginning and end of a working day. Symptoms were assessed using the Quality of Vision questionnaire (QoV), 5‐item Dry Eye Questionnaire (DEQ‐5) and Symptom Assessment in Dry Eye
Cristian Talens‐Estarelles, María Mechó‐García, Colm McAlinden, Alejandro Cerviño, Santiago García‐Lázaro, José Manuel González‐Méijome   +5 more
wiley   +1 more source

Atmospheric Turbulence with Kolmogorov Spectra: Software Simulation, Real-Time Reconstruction and Compensation by Means of Adaptive Optical System with Bimorph and Stacked-Actuator Deformable Mirrors

Photonics, 2023
Atmospheric turbulence causes refractive index fluctuations, which in turn introduce extra distortions to the wavefront of the propagated radiation. It ultimately degrades telescope resolution (in imaging applications) and reduces radiation power density
Ilya Galaktionov, Julia Sheldakova, Vadim Samarkin, Vladimir Toporovsky, Alexis Kudryashov   +4 more
doaj   +1 more source

Monochromatic ocular high‐order aberrations in children and adolescents

Ophthalmic and Physiological Optics, Volume 43, Issue 4, Page 842-859, July 2023., 2023
Abstract Purpose To investigate the prevalence and repeatability of high‐order aberrations (HOAs) from non‐cyclopleged eyes in 1515 children and adolescents 2.5–18 years of age. Methods The Leipzig Research Centre for Civilization Diseases (LIFE)‐Child study is a population‐based, prospective, observational single‐centre study that investigates the ...
Franziska G. Rauscher, Andreas Hiemisch, Wieland Kiess, Ralf Blendowske   +3 more
wiley   +1 more source

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, Alexander Alexandrov, Ilya Galaktionov, Alexis Kudryashov, Alexander Nikitin, Alexey Rukosuev, Vladimir Toporovsky, Julia Sheldakova   +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, Lejia Hu, Biwei Zhang, Wei Gong, Ke Si   +4 more
doaj   +1 more source

Nonlinear wavefront reconstruction with convolutional neural networks for Fourier-based wavefront sensors [PDF]

Optics Express Vol. 28, Issue 11, pp. 16644-16657 (2020), 2020
Fourier-based wavefront sensors, such as the Pyramid Wavefront Sensor (PWFS), are the current preference for high contrast imaging due to their high sensitivity. However, these wavefront sensors have intrinsic nonlinearities that constrain the range where conventional linear reconstruction methods can be used to accurately estimate the incoming ...
arxiv   +1 more source

Numerical research of measurements of Shack-Hartmann wavefront sensor according to the parameters of its optical parts and the intensity of turbulent distortions [PDF]

, 2015
The wavefront sensor of Hartmann type consists of two parts: the optical and algorithmic. The parameters of the optical part of the sensor may vary. Since the time of “frozen” turbulence due to the Fried’s length and to the cross wind transport turbulent
Goleneva, N. V., Lavrinov, V. V., Lavrinova, L. N.   +2 more
core   +2 more sources

Shack Hartmann wavefront sensor with array of phase coded masks [PDF]

, 2021
Shack-Hartmann wavefront sensors (SHWS) are generally used to measure the wavefront curvature of light beams. Measurement accuracy and the sensitivity of these sensors are important factors for better wavefront sensing. In this study, we demonstrate a new type of SHWS with better measurement accuracy than the regular SHWS.
arxiv   +1 more source