Results 11 to 20 of about 49,183 (221)

Laser Guide Star for Large Segmented-Aperture Space Telescopes, Part I: Implications for Terrestrial Exoplanet Detection and Observatory Stability

, 2018
Precision wavefront control on future segmented-aperture space telescopes presents significant challenges, particularly in the context of high-contrast exoplanet direct imaging.
Cahoy, Kerri L., Clark, James, Douglas, Ewan S., Guyon, Olivier, Lumbres, Jennifer R., Males, Jared R., Marlow, Weston A.   +6 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

Coronagraphic Low Order Wavefront Sensor: Principle and Application to a Phase-Induced Amplitude Coronagraph [PDF]

, 2009
High contrast coronagraphic imaging of the immediate surrounding of stars requires exquisite control of low-order wavefront aberrations, such as tip-tilt (pointing) and focus.
Belikov, Digby, Guyon, Guyon, Kuchner, Kuchner, Lloyd, Olivier Guyon, Palacios, Roger Angel, Shaklan, Sivaramakrishnan, Taro Matsuo   +12 more
core   +1 more source

Wavefront sensing with a brightest pixel selection algorithm

, 2011
Astronomical adaptive optics systems with open-loop deformable mirror control have recently come on-line. In these systems, the deformable mirror surface is not included in the wavefront sensor paths, and so changes made to the deformable mirror are not ...
A. G. Basden, Basden, Basden, E. Gendron, Foy, Gendron, Gendron, Lardière, Marchetti, Masciadri, Myers, R. M. Myers, Roddier, Simonich, Tatarski, Thomas, Thomas   +16 more
core   +3 more sources

The Subaru Coronagraphic Extreme Adaptive Optics system: enabling high-contrast imaging on solar-system scales [PDF]

, 2015
The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is a multipurpose high-contrast imaging platform designed for the discovery and detailed characterization of exoplanetary systems and serves as a testbed for high-contrast imaging ...
Baba, N., Clergeon, C., Close, L., Doughty, D., Duchene, G., Garrel, V., Gauchet, L., Guyon, O., Hayano, Y., Huby, E., Jovanovic, N., Kotani, T., Kudo, T., Kuhn, J., Lacour, S., Lai, O., Lozi, J., Males, J., Marchis, F., Martinache, F., Matsuo, T., Minowa, Y., Morino, J., Murakami, N., Newman, K., Nishikawa, J., Norris, B., Oshiyama, F., Perrin, G., Schworer, G., Serabyn, E., Singh, G., Stewart, P., Takato, N., Tamura, M., Tuthill, P., Vievard, S., Woillez, J.   +37 more
core   +3 more sources

Large Transverse Thermoelectric Effect in Weyl Semimetal TaIrTe4 Engineered for Photodetection

Advanced Functional Materials, EarlyView.
This experimental work shows that the anomalous scanning photocurrent response patterns of the Weyl semimetal TaIrTe4${\rm TaIrTe}_4$ under visible and long‐wave infrared illumination are due to a large transverse thermoelectric response of the material.
Morgan G. Blevins, Xianglin Ji, Vivian J. Santamaria‐Garcia, Abhishek Mukherjee, Thanh Nguyen, Mingda Li, Svetlana V. Boriskina   +6 more
wiley   +1 more source

Measurement of Thermo-Elastic Deformation of an Optic using a Polarization Based Shearing Interferometer

, 2012
A shearing interferometer is presented which uses polarization control to shear the wavefront and to modulate the interference pattern. The shear is generated by spatial walk-off in a birefringent crystal. By adjusting the orientation of the birefringent
Abramowitz, Agrawal, Fowels, Ghiglia, Hello, Hello, Kothiyal, Lu, Murukeshan, Nikogosyan, Rosso, Servin, Winkler, Yariv, Zhu Tuan   +14 more
core   +1 more source

Light-controllable metasurface for microwave wavefront manipulation

Optics Express, 2020
Applying multiple physical fields to artificial manipulate electromagnetic waves is a highly stirring research. In this paper, we creatively combine light control with microwave scattering, realizing an optically coding metasurface for beam deflection based on anomalous reflection.
Lei Chen, Qian Fan Nie, Ying Ruan, Si Si Luo, Fu Ju Ye, Hao Yang Cui   +5 more
openaire   +2 more sources

Decoding THz‐Driven Dynamic Fingerprints of Ferroelectric Nanotwin Networks

Advanced Materials, EarlyView.
ABSTRACT Ultrafast polarization dynamics in ferroelectrics are of considerable interest for high‐speed tunable dielectrics and electro‐optics. Extended domain wall networks formed in ferroelectric twin nanodomains can support collective dynamics in the terahertz regime but require techniques that track polarization and strain evolution driven by ...
Xiaojiang Li, Aiden Ross, Vladimir A. Stoica, Sujit Das, Sankalpa Hazra, Huaiyu (Hugo) Wang, Hari Padma, Matthias C. Hoffmann, Patrick Kramer, Sanghoon Song, Silke Nelson, Takahiro Sato, Diling Zhu, Ramamoorthy Ramesh, Lane W. Martin, Yue Cao, John W. Freeland, Aaron M. Lindenberg, Haidan Wen, Long‐Qing Chen, Venkatraman Gopalan   +20 more
wiley   +1 more source

Model-based wavefront control for CCAT [PDF]

SPIE Proceedings, 2011
The 25-m aperture CCAT submillimeter-wave telescope will have a primary mirror that is divided into 162 individual segments, each of which is provided with 3 positioning actuators. CCAT will be equipped with innovative Imaging Displacement Sensors (IDS) - inexpensive optical edge sensors - capable of accurately measuring all segment relative motions.
Redding, David, Lou, John Z., Kissil, Andy, Bradford, Matt, Padin, Steve, Woody, David   +5 more
openaire   +2 more sources