Results 11 to 20 of about 1,567 (171)

Spatiotemporal statistics of the turbulent piston-removed phase and Zernike coefficients for two distinct beams

, 2022
In the context of adaptive optics for astronomy, one can rely on the statistics of the turbulent phase to assess a part of the system's performance. Temporal statistics with one source and spatial statistics with two sources are well-known and are widely
Plantet, Cédric, Agapito, Guido, Busoni, Lorenzo, Carlà, Giulia   +3 more
core   +2 more sources

A universal framework for microscope sensorless adaptive optics: Generalized aberration representations

APL Photonics, 2020
Adaptive optics (AO) methods are widely used in microscopes to improve image quality through correction of phase aberrations. A range of wavefront-sensorless AO schemes exist, such as modal, pupil segmentation zonal, and pixelated piston-based methods ...
Q. Hu, J. Wang, J. Antonello, M. Hailstone, M. Wincott, R. Turcotte, D. Gala, M. J. Booth   +7 more
doaj   +1 more source

Experimental validation of large differential piston sensing with the double-wavelength LIFT [PDF]

, 2023
International audienceExperimental validation of large differential piston sensing with the double-wavelength ...
Rossi, Fabio, PUGLISI, Alfio Timothy, Lombardi, Simone, Selmi, Chiara, Busoni, Lorenzo, CHEFFOT, Anne Laure Lucie, Bonaglia, Marco, Puglisi, Alfio, PLANTET, Cedric Antoine Adrien Gabriel, Cheffot, Anne-Laure, Esposito, Simone, Plantet, Cedric   +11 more
core   +1 more source

Oil Film Formation of Reciprocating Seals Observed by Interferometry

Tribology Online, 2014
Oil film thickness in rubber piston seals is measured by interferometry. Optimized optics and fluids enable clear interferograms. The oil film thickness on the contact area is measured during reciprocating motion.
Kenichi Yoshimura, Nozomu Suzuki, Hirotaka Mizuta   +2 more
doaj   +1 more source

A Compact Tunable Diode Laser Absorption Spectrometer to Monitor CO2 at 2.7 µm Wavelength in Hypersonic Flows

Sensors, 2010
Since the beginning of the Mars planet exploration, the characterization of carbon dioxide hypersonic flows to simulate a spaceship’s Mars atmosphere entry conditions has been an important issue.
Raphäel Vallon, Jacques Soutadé, Jean-Luc Vérant, Jason Meyers, Sébastien Paris, Ajmal Mohamed   +5 more
doaj   +1 more source

Sensitivity to differential piston and to adaptive optics errors with the Large Binocular Telescope Interferometer [PDF]

, 2016
On-sky adaptive optics wavefront screens have been used and random optical path fluctuations - differential pistons - have been included in numerical simulations for the Large Binocular Telescope Interferometer. We characterize the Point Spread Function (
Alfio Puglisi, Simone Esposito, PINNA, Enrico, Fabien Patru, ESPOSITO, Simone, ARCIDIACONO, CARMELO, Patru, Fabien, PUGLISI, Alfio Timothy, Hill, John, RICCARDI, Armando, Armando Riccardi, John Hill, Hinz, Philip, Philip Hinz, Enrico Pinna, Carmelo Arcidiacono   +15 more
core   +1 more source

The Giant Magellan Telescope adaptive optics program [PDF]

, 2016
The Giant Magellan Telescope adaptive optics system will be an integral part of the telescope, providing laser guide star generation, wavefront sensing, and wavefront correction to most of the currently envisioned instruments.
Arcidiacono, Carmelo, Carbonaro, Luca, Conan, Rodolphe, d'Orgeville, Celine, Brusa-Zappellini, Guido, Bouchez, A, Bonaglia, Marco, Bennet, Francis, Uhlendorf, Kristina, Acton, D. Scott, Biliotti, Valdemaro, Agapito, Guido, Briguglio, Runa, Parcell, Simon, Busoni, Lorenzo, Piatrou, Piotr, Espeland, Brady, Gardhouse, William, Price, Ian   +18 more
core   +1 more source

Experimental Demonstration of Coherent Combining With Tip/Tilt Control Based on Adaptive Space-to-Fiber Laser Beam Coupling

IEEE Photonics Journal, 2017
A novel approach of tip/tilt control through optimizing laser beam coupling efficiencies from space to polarization-maintaining-fibers with stochastic parallel gradient descent (SPGD) algorithm for coherent beam combining (CBC) applications is ...
Feng Li, Chao Geng, Guan Huang, Yan Yang, Xinyang Li, Qi Qiu   +5 more
doaj   +1 more source

Operation of a MOEMS Deformable Mirror in Cryo: Challenges and Results

Micromachines, 2017
Micro-opto-electro-mechanical systems (MOEMS) Deformable Mirrors (DM) are key components for next generation optical instruments implementing innovative adaptive optics systems, both in existing telescopes and in the future ELTs.
Frederic Zamkotsian, Patrick Lanzoni, Rudy Barette, Michael Helmbrecht, Franck Marchis, Alex Teichman   +5 more
doaj   +1 more source

Realization of large energy proportion in the central lobe by coherent beam combination based on conformal projection system

Scientific Reports, 2017
In this paper, we experimentally validate a tiled-aperture conformal projection system with the largest array filling factor and element beam truncation factor to the best of our knowledge. The conformal projection system, which is made up of a hexagonal
Dong Zhi, Zhixin Zhang, Yanxing Ma, Xiaolin Wang, Zilun Chen, Wuming Wu, Pu Zhou, Lei Si   +7 more
doaj   +1 more source