Results 91 to 100 of about 6,169 (204)

High-Resolution Imaging in the Visible on Large Ground-Based Telescopes

, 2014
Lucky Imaging combined with a low order adaptive optics system has given the highest resolution images ever taken in the visible or near infrared of faint astronomical objects.
Crass, Jonathan, González-Escélera, Víctor, King, David L., Labadie, Lucas, López, Roberto, Mackay, Craig, Oscoz, Alejandro, Puga, Marta, Pérez-Garrido, Antonio, Pérez-Prieto, Jorge A., Rebolo, Rafael, Rodríguez-Ramos, Luis F., Velasco, Sergio, Villó, Isidro   +13 more
core   +1 more source

Deep learning enabled robust wavefront sensing for active beam smoothing with a continuous phase modulator

High Power Laser Science and Engineering
In laser systems requiring a flat-top distribution of beam intensity, beam smoothing is a critical technology for enhancing laser energy deposition onto the focal spot.
Yamin Zheng, Yifan Zhang, Liquan Guo, Pei Li, Zichao Wang, Yongchen Zhuang, Shibing Lin, Qiao Xue, Deen Wang, Lei Huang   +9 more
doaj   +1 more source

The Deformable Mirror Demonstration Mission (DeMi) CubeSat: optomechanical design validation and laboratory calibration

, 2018
Coronagraphs on future space telescopes will require precise wavefront correction to detect Earth-like exoplanets near their host stars. High-actuator count microelectromechanical system (MEMS) deformable mirrors provide wavefront control with low size ...
Allan, Gregory, Barnes, Derek, Cahoy, Kerri L., Douglas, Ewan S., Egan, Mark, Furesz, Gabor, Grunwald, Warren, Gubner, Jennifer, Haughwout, Christian, Holden, Bobby G., Pereira, Paula do Vale, Stein, Abigail J.   +11 more
core   +1 more source

Single-shot quantitative aberration and scattering length measurements in mouse brain tissues using an extended-source Shack-Hartmann wavefront sensor

, 2022
Sophia Imperato, Fabrice Harms, Antoine Hubert, Mathias Mercier, Laurent Bourdieu, Alexandra Fragola   +5 more
openalex   +1 more source

Lorentz Force Actuated Tunable-Focus Liquid Lens

Micromachines, 2019
Tunable-focus liquid lenses provide focal length tuning for optical systems, e.g., cameras, where physical movement of rigid lenses are not an option or not preferable.
Kari L. Van Grinsven, Alireza Ousati Ashtiani, Hongrui Jiang   +2 more
doaj   +1 more source

High-resolution imaging and spectroscopy in the visible from large ground-based telescopes with natural guide stars

, 2010
Near-diffraction limited imaging and spectroscopy in the visible on large (8-10 meter) class telescopes has proved to be beyond the capabilities of current adaptive optics technologies, even when using laser guide stars.
King, David, Mackay, Craig, Staley, Tim D., Suess, Frank, Weller, Keith   +4 more
core   +1 more source

Flexible Electrowetting-on-Dielectric Microlens Array Sheet

Micromachines, 2019
We have fabricated a fully-flexible, focus-tunable microlens array on a sheet and demonstrated its imaging capabilities. Each liquid lens of the array is individually tunable via electrowetting on dielectric (EWOD) actuation and is situated on a ...
Kari L. Van Grinsven, Alireza Ousati Ashtiani, Hongrui Jiang   +2 more
doaj   +1 more source

Shack-Hartmann wavefront sensor optical dynamic range. [PDF]

Opt Express, 2021
Akondi V, Dubra A.
europepmc   +1 more source

Analysis of EMCCD and sCMOS readout noise models for Shack-Hartmann wavefront sensor accuracy [PDF]

, 2015
Alastair Basden
openalex   +1 more source

A Multi-Deformable-Mirror 500 Hz Adaptive Optical System for Atmospheric Turbulence Simulation, Real-Time Reconstruction, and Wavefront Correction Using Bimorph and Tip-Tilt Correctors

Photonics
Atmospheric turbulence introduces distortions to the wavefront of propagating optical radiation. It causes image resolution degradation in astronomical telescopes and significantly reduces the power density of radiation on the target in focusing ...
Ilya Galaktionov, Vladimir Toporovsky
doaj   +1 more source