Results 61 to 70 of about 239,453 (286)
Scattering correcting wavefront shaping for three-photon microscopy
Optics Letters, 2022 Three-photon (3P) microscopy is getting traction due to its superior performance in deep tissues. Yet, aberrations and light scattering still pose one of the main limitations in the attainable depth ranges for high-resolution imaging. Here, we show scattering correcting wavefront shaping with a simple continuous optimization algorithm, guided by the ...
Bernhard Rauer +3 more
openaire +3 more sources
Photonics, 2023 In dual-wavelength free-space optical communication systems, the wavefront distortion differences caused by the wavelength difference of the signal and beacon lights cannot be completely corrected.
Jiali Wu +4 more
doaj +1 more source
Single conjugate adaptive optics for the ELT instrument METIS [PDF]
, 2018 The ELT is a 39m large, ground-based optical and near- to mid-infrared telescope under construction in the Chilean Atacama desert. Operation is planned to start around the middle of the next decade.
Absil, Olivier +9 more
core +3 more sources
Integrated modeling of wavefront sensing and control for space telescopes utilizing active and adaptive optics [PDF]
arXiv, 2023 Extreme wavefront correction is required for coronagraphs on future space telescopes to reach 1e-8 or better starlight suppression for the direct imaging and characterization of exoplanets in reflected light. Thus, a suite of wavefront sensors working in tandem with active and adaptive optics are used to achieve stable, nanometer-level wavefront ...
arxiv
Infinite impulse response modal filtering in visible adaptive optics
, 2012 Diffraction limited resolution adaptive optics (AO) correction in visible wavelengths requires a high performance control. In this paper we investigate infinite impulse response filters that optimize the wavefront correction: we tested these algorithms ...
Agapito, G. +4 more
core +1 more source
Fundamental limits to high-contrast wavefront control [PDF]
, 2017 The current generation of ground-based coronagraphic instruments uses deformable mirrors to correct for phase errors and to improve contrast levels at small angular separations. Improving these techniques, several space and ground based instruments are currently developed using two deformable mirrors to correct for both phase and amplitude errors ...
arxiv +1 more source
Phase-Retrieval-Based Wavefront Metrology for High Contrast Coronagraphy [PDF]
Proceedings Volume 10698, Space Telescopes and Instrumentation
2018: Optical, Infrared, and Millimeter Wave; 106986I (2018), 2019 We discuss the use of parametric phase-diverse phase retrieval as an in-situ high-fidelity wavefront measurement method to characterize and optimize the transmitted wavefront of a high-contrast coronagraphic instrument. We apply our method to correct the transmitted wavefront of the HiCAT (High contrast imager for Complex Aperture Telescopes ...
arxiv +1 more source
Stochastic optimization for adaptive real -time wavefront correction [PDF]
Numerical Algorithms, 2002 Summarization: We have investigated the performance of an adaptive optics system subjected to changing atmospheric conditions, under the guidance of the ALOPEX stochastic optimization. Atmospheric distortions are smoothed out by means of a deformable mirror, the shape of which can be altered in order to follow the rapidly changing atmospheric phase ...
Ζακυνθινακη Μαρια(http://users.isc.tuc.gr/~mzakynthinaki) +3 more
openaire +3 more sources
, 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 +11 more
core +1 more source
Fast linearized coronagraph optimizer (FALCO) I: a software toolbox for rapid coronagraphic design and wavefront correction [PDF]
, 2018 The Fast Linearized Coronagraph Optimizer (FALCO) is an open-source toolbox of routines for coronagraphic focal plane wavefront correction. The goal of FALCO is to provide a free, modular framework for the simulation or testbed operation of several ...
Bifano +14 more
core +1 more source