Results 61 to 70 of about 2,071,972 (337)
Adaptive optics with an infrared pyramid wavefront sensor at Keck
Journal of Astronomical Telescopes Instruments and Systems, 2020 . The study of cold or obscured, red astrophysical sources can significantly benefit from adaptive optics (AO) systems employing infrared (IR) wavefront sensors.
C. Bond +20 more
semanticscholar +1 more source
A new low-cost, compact, auto-phoropter for refractive assessment in developing countries
Scientific Reports, 2017 Using a phoropter to measure the refractive error is one of the most commonly used methods by ophthalmologists and optometrists. Here, we demonstrate design and fabrication of a portable automatic phoropter with no need for patient’s feedback. The system
Babak Amirsolaimani +4 more
doaj +1 more source
IEEE Photonics Journal, 2021 The charge-coupled device-based Shaker–Hartmann wavefront sensor has been widely used to compensate for wavefront distortion in coherent optical communication.
Xu Yan +6 more
doaj +1 more source
Direct observation of atmospheric turbulence with a video-rate wide-field wavefront sensor
Nature PhotonicsTurbulence is a complex and chaotic state of fluid motion. Atmospheric turbulence within the Earth’s atmosphere poses fundamental challenges for applications such as remote sensing, free-space optical communications and astronomical observation due to ...
Yuduo Guo +8 more
semanticscholar +1 more source
Optics Express, 2020 Adaptive optics systems are used to compensate for distortions of the wavefront of light induced by turbulence in the atmosphere. Shack-Hartmann wavefront sensors are used to measure this wavefront distortion before correction.
D. Lechner +3 more
semanticscholar +1 more source
On-sky correction of non-common path aberration with the pyramid wavefront sensor
Astronomy & Astrophysics, 2020 The paper deals with with the on-sky performance of the pyramid wavefront sensor-based Adaptive Optics (AO) systems. These wavefront sensors are of great importance, being used in all first light AO systems of the ELTs (E-ELT, GMT, and TMT), currently in
S. Esposito +6 more
semanticscholar +1 more source
Visible and Near-infrared Laboratory Demonstration of a Simplified Pyramid Wavefront Sensor [PDF]
Publications of the Astronomical Society of the Pacific, 2019 Wavefront sensing and control are important for enabling one of the key advantages of using large apertures, namely higher angular resolution. Pyramid wavefront sensors are becoming commonplace in new instrument designs owing to their superior ...
J. Lozi +6 more
semanticscholar +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 +3 more
doaj +1 more source
Demonstrating predictive wavefront control with the Keck II near-infrared pyramid wavefront sensor [PDF]
Optical Engineering + Applications, 2019 The success of ground-based instruments for high contrast exoplanet imaging depends on the degree to which adaptive optics (AO) systems can mitigate atmospheric turbulence.
R. Jensen-Clem +7 more
semanticscholar +1 more source
Microsphere Autolithography—A Scalable Approach for Arbitrary Patterning of Dielectric Spheres
Advanced Functional Materials, EarlyView.MicroSphere Autolithography (µSAL) enables scalable fabrication of patchy particles with customizable surface motifs. Focusing light through dielectric microspheres creates well defined, tunable patches via a conformal poly(dopamine) photoresist. Nearly arbitrary surface patterns can be achieved, with the resolution set by the index contrast between ...
Elliott D. Kunkel +3 more
wiley +1 more source