Results 61 to 70 of about 92,983 (175)

Breaking of Wavelength-Dependence in Holographic Wavefront Sensors Using Spatial-Spectral Filtering

Sensors, 2023
Nowadays, wavefront sensors are widely used to control the shape of the wavefront and detect aberrations of the complex field amplitude in various fields of physics. However, almost all of the existing wavefront sensors work only with quasi-monochromatic
Nikita Stsepuro, Michael Kovalev, Evgenii Zlokazov, Sergey Kudryashov   +3 more
doaj   +1 more source

An all-photonic focal-plane wavefront sensor

Nature Communications, 2020
Adaptive optics wavefront sensors need to be in a pupil plane and are insensitive to certain wavefront-error modes. The authors present a wavefront sensor based on a photonic lantern fibre-mode-converter and deep learning, which can be placed at the same
Barnaby R. M. Norris, Jin Wei, Christopher H. Betters, Alison Wong, Sergio G. Leon-Saval   +4 more
doaj   +1 more source

Detection of phase singularities with a Shack-Hartmann wavefront sensor

, 2006
While adaptive optical systems are able to remove moderate wavefront distortions in scintillated optical beams, phase singularities that appear in strongly scintillated beams can severely degrade the performance of such an adaptive optical system ...
Aksenov, Arrasmith, Barchers, Coullet, Filippus S. Roux, Fried, Fried, Hattori, Herrmann, Herrmann, Hudgin, Jan C. Olivier, Mingzhou Chen, Nye, Roggemann, Roux, Southwell, Talmi, Tyler, van Dam   +19 more
core   +1 more source

A smooth introduction to the wavefront set

, 2014
The wavefront set provides a precise description of the singularities of a distribution. Because of its ability to control the product of distributions, the wavefront set was a key element of recent progress in renormalized quantum field theory in curved
Alinhac S, Bogoliubov N N, Bogoliubov N N, Bogoliubov N N, Brouder C, Brunetti R, Cappiello M, Chazarain J, Christian Brouder, Dang N V, Duistermaat J J, Epstein H, Eskin G, Fewster C J, Folland G B, Folland G B, Friedlander F G, Frédéric Hélein, Gelʼfand I M, Grohs P ed Kutyniok G, Harris B, Hollands S, Hörmander L, Hörmander L, Itzykson C, Ivrii V J, Liess O, Maksimović S, Nguyen Viet Dang, Oberguggenberger M, Oberguggenberger M, Peskin M E, Reed M, Rivier D, Schwartz L, Stueckelberg E C G, Stueckelberg E C G, Stueckelberg E C G, Taylor M E, Wagschal C, Zhang H H   +40 more
core   +3 more sources

Wavefront sets in algebraic quantum field theory

, 1998
The investigation of wavefront sets of n-point distributions in quantum field theory has recently acquired some attention stimulated by results obtained with the help of concepts from microlocal analysis in quantum field theory in curved spacetime.
Verch, Rainer
core   +2 more sources

Parallelising wavefront applications on general-purpose GPU devices [PDF]

, 2010
Pipelined wavefront applications form a large portion of the high performance scientific computing workloads at supercomputing centres. This paper investigates the viability of graphics processing units (GPUs) for the acceleration of these codes, using ...
Hammond, Simon D., Jarvis, Stephen A., Mudalige, Gihan R., Pennycook, Simon J.   +3 more
core  

Repeatability and Interchangeability of Topometric, Anterior Chamber and Corneal Wavefront Data Between Two Scheimpflug Camera Devices

Clinical Ophthalmology, 2020
Hesham Mohamed Gharieb,1,2 Hisham Samy Shalaby,3 Ihab Saad Othman4,5 1Faculty of Medicine, Ain Shams University, Cairo, Egypt; 2Research and Development, Eye World Hospital, Giza, Egypt; 3Department of Ophthalmology, Faculty of Medicine, Ain Shams ...
Gharieb HM, Shalaby HS, Othman IS
doaj  

Spatio-temporal modelling of wave formation in an excitable chemical medium based on a revised FitzHugh-Nagumo model [PDF]

, 2010
The wavefront profile and the propagation velocity of waves in an experimentally observed Belousov-Zhabotinskii reaction are analyzed and a revised FitzHumgh-Nagumo(FHN) model of these systems is identified.
Billings, S.A., Coca, D., DeMatos, L., Guo, Y., Ristic, R.I, Zhao, Y.   +5 more
core  

Wavefront sensor and wavefront corrector matching in adaptive optics

Optics Express, 2007
Matching wavefront correctors and wavefront sensors by minimizing the condition number and mean wavefront variance is proposed. The particular cases of two continuous-sheet deformable mirrors and a Shack-Hartmann wavefront sensor with square packing geometry are studied in the presence of photon noise, background noise and electronics noise.
openaire   +2 more sources

Recovering pyramid WS gain in non-common path aberration correction mode via deformable lens

, 2017
It is by now well known that pyramid based wavefront sensors, once in closed loop, have the capability to improve more and more the gain as the reference natural star image size is getting smaller on the pyramid pin. Especially in extreme adaptive optics
Bergomi, M., Bonora, S., Chinellato, S., Favazza, P., Magrin, D., Quintavalla, M., Ragazzoni, R., Umbriaco, G.   +7 more
core   +1 more source