Results 31 to 40 of about 49,183 (221)

On-sky demonstration of low-order wavefront sensing and control with focal plane phase mask coronagraphs [PDF]

, 2015
The ability to characterize exoplanets by spectroscopy of their atmospheres requires direct imaging techniques to isolate planet signal from the bright stellar glare.
Baudoz, Pierre, Guyon, Olivier, Jovanovic, Nemanja, Kudo, Tomoyuki, Kuhn, Jonas, Lozi, Julien, Martinache, Frantz, Serabyn, Eugene, Singh, Garima   +8 more
core   +5 more sources

Nonlinear Wavefront Control with All-Dielectric Metasurfaces

Nano Letters, 2018
Metasurfaces, two-dimensional lattices of nanoscale resonators, offer unique opportunities for functional flat optics and allow the control of the transmission, reflection, and polarization of a wavefront of light. Recently, all-dielectric metasurfaces reached remarkable efficiencies, often matching or out-performing conventional optical elements.
Lei Wang, Sergey Kruk, Kirill Koshelev, Ivan Kravchenko, Barry Luther-Davies, Yuri Kivshar   +5 more
openaire   +4 more sources

Study of Free‐Space Optical Quantum Network: Review and Prospectives

Advanced Science, EarlyView.
Free from the constraints of fiber connections, free‐space quantum network enables longer and more flexible quantum network connections. This review summarizes and comparatively analyzes free‐space quantum network experiments based on ground stations, satellites, and mobile platforms.
Hua‐Ying Liu, Zhenda Xie, Shining Zhu
wiley   +1 more source

Single-photon entanglement generation by wavefront shaping in a multiple-scattering medium

, 2014
We demonstrate the control of entanglement of a single photon between several spatial modes propagating through a strongly scattering medium. Measurement of the scattering matrix allows the wavefront of the photon to be shaped to compensate the ...
Barbieri, Marco, Chalopin, Benoit, Chatel, Beatrice, Defienne, Hugo, Gigan, Sylvain, Smith, Brian J., Walmsley, Ian A.   +6 more
core   +3 more sources

VIRGO mirrors: wavefront control

Optical and Quantum Electronics, 1999
The Franco-Italian VIRGO program to detect gravitational waves requires large mirrors whose optical properties are extremely severe: absorption and scattering
Mackowski, J.-M., Pinard, L., Dognin, L., Ganau, P., Lagrange, B., Michel, Christine, Morgue, M.   +6 more
openaire   +1 more source

Predictive control of thermally induced wavefront aberrations

Optics Express, 2013
In this paper we experimentally demonstrate the proof of concept for predictive control of thermally induced wavefront aberrations in optical systems. On the basis of the model of thermally induced wavefront aberrations and using only past wavefront measurements, the proposed adaptive optics controller is able to predict and to compensate the future ...
Haber, A. (author), Polo, A. (author), Maj, I. (author), Pereira, S.F. (author), Urbach, H.P. (author), Verhagen, M.H.G. (author)   +5 more
openaire   +4 more sources

Wavefront control system for the Keck telescope [PDF]

SPIE Proceedings, 1998
The laser guide star adaptive optics system currently being developed for the Keck 2 telescope consists of several major subsystems: the optical bench, wavefront control, user interface and supervisory control, and the laser system. The paper describes the design and implementation of the wavefront control subsystem that controls a 349 actuator ...
James M. Brase, Jong R. An, Kenneth Avicola, Barton V. Beeman, Donald T. Gavel, Randall L. Hurd, Brooks Johnston, Holger E. Jones, Thomas C. Kuklo, Claire E. Max, Scot S. Olivier, Kenneth E. Waltjen, James A. Watson   +12 more
openaire   +1 more source

Non‐Invasively Tracking an Arbitrary Deformable Object Through Scattering Media and Around Corners via Speckle Correlations

Advanced Science, EarlyView.
A speckle correlation centroid localization method (SCCLM) is proposed for non‐invasive tracking of an arbitrary deformable object through scattering media and around corners, requiring no prior information. Its effectiveness is demonstrated not only in tracking hidden objects beyond the memory effect region but also in following objects undergoing ...
Aiping Zhai, Wenjing Ji, Yan Wang, Xiyuan Luo, Wenjing Zhao, Dong Wang, Fei Liu   +6 more
wiley   +1 more source

Active Control of Laser Wavefronts in Atom Interferometers

, 2017
Wavefront aberrations are identified as a major limitation in quantum sensors. They are today the main contribution in the uncertainty budget of best cold atom interferometers based on two-photon laser beam splitters, and constitute an important limit ...
Langlois, Mehdi, Merlet, Sébastien, Santos, Franck Pereira dos, Trimeche, Azer   +3 more
core   +3 more sources

In Situ Polyurea Integration for Self‐Healing, Durable Transparent Electromagnetic‐Interference Shielding Film

Advanced Science, EarlyView.
A steric‐hindrance molecular engineering strategy uses dimethyl maleate (DMM) to convert poly(1,4‐butanediol) bis(4‐aminobenzoate) (PBDAB) into a precursor with reduced reactivity via Michael addition, thereby retarding the curing process to form a transparent, ultraflexible, and self‐healable secondary‑amine polyurea (PuSA) with a crosslinked network.
Sinan Zheng, Shanyu Zhao, Gengjiang Yao, Yue Liu, Fei Pan, Mingrui Han, Zecheng Li, Shanbo Li, Jiurong Liu, Na Wu, Zhihui Zeng   +10 more
wiley   +1 more source