Results 91 to 100 of about 5,505 (209)
Coherence vortices by binary pinholes
Nanophotonics, Volume 13, Issue 24, Page 4397-4407, November 2024.Abstract Singularity in a two‐point complex coherence function, known as coherence vortices, represents zero visibility with a helical phase structure. In this paper, we introduce a novel technique to generate the coherence vortices of different topological charges by incoherent source transmittance with exotic structured binary pinholes.
Akanksha Gautam +2 more
wiley +1 more source
Spectrally resolved single-shot wavefront sensing of broadband high-harmonic sources
, 2017 Wavefront sensors are an important tool to characterize coherent beams of extreme ultraviolet radiation. However, conventional Hartmann-type sensors do not allow for independent wavefront characterization of different spectral components that may be ...
0000-0003-4753-3173 +5 more
core +2 more sources
Journal of Synchrotron Radiation, Volume 31, Issue 5, Page 1293-1298, September 2024.X‐ray phase‐contrast microtomography is demonstrated using two‐dimensional amplitude modulation of the beam. The implementation is characterised in terms of angular sensitivity and spatial resolution, and its application to the three‐dimensional imaging of biological soft tissues is shown.Two‐directional beam‐tracking (2DBT) is a method for phase ...
Carlos Navarrete-León +10 more
wiley +1 more source
, 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 +4 more
core +1 more source
Soft X‐ray wavefront sensing at an ellipsoidal mirror shell
Journal of Synchrotron Radiation, Volume 31, Issue 4, Page 690-697, July 2024.Phase retrieval at an axisymmetric ellipsoidal mirror is demonstrated with soft X‐rays (277 eV), completed by a reconstruction of the focus as well as figure and alignment error of the mirror. Based on simple measurements of the cross‐focal, three‐dimensional intensity distribution, an intuitive algorithm is proposed which combines the advantages of ...
Christoph Braig +5 more
wiley +1 more source
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 +13 more
core +1 more source
Gaze and behavioural metrics in the refractive correction of presbyopia
Ophthalmic and Physiological Optics, Volume 44, Issue 4, Page 774-786, June 2024.Abstract Purpose To investigate gaze and behavioural metrics at different viewing distances with multifocal contact lenses (MFCLs), single vision contact lenses (SVCLs) and progressive addition lenses (PALs). Methods Fifteen presbyopic contact lens wearers participated over five separate study visits.
Sarah L. Smith +3 more
wiley +1 more source
Journal of the European Optical Society-Rapid Publications, 2020 In some active optics system, the influence function, which is the surface deformation ability of an actuator, is measured by directly detecting the mirror surface using an interferometer and the surface correction of the primary mirror is done using the
Yi Zhu, Tao Chen, Hongzhuang Li
doaj +1 more source
Broadband, Common-Path, Interferometric Wavefront Sensor [PDF]
Hybrid sensors comprising Shack-Hartmann Wavefront Sensor (S-HWFS) and Zernike Wavefront Sensor (Z-WFS) capabilities are presented. The hybrid sensor includes a Z-WFS optically arranged in-line with a S-HWFS such that the combined wavefront sensor ...
Wallace, James Kent
core +1 more source
, 2010 The Magellan Adaptive Secondary AO system, scheduled for first light in the fall of 2011, will be able to simultaneously perform diffraction limited AO science in both the mid-IR, using the BLINC/MIRAC4 10\{mu}m camera, and in the visible using our novel
Close, Laird M. +4 more
core +1 more source