Results 191 to 200 of about 325,753 (218)

Model driven-based extended target piston sensing for optical synthesis aperture imaging system

Applied Optics and Photonics China
The next generation of Earth observation on-orbit optical telescopes will provide high-resolution imaging of complex scene by using the aperture synthesis technique. Fast correction of pistons among each subaperture is the critical factor to preserve the
Kaiyuan Yang, Xiafei Ma, Haotong Ma, Zongliang Xie   +3 more
semanticscholar   +1 more source

Adaptive optics development at the Giant Magellan Telescope: recent progress

Astronomical Telescopes + Instrumentation
In the past two years significant forward progress has been achieved in development of Adaptive Optics sensing and control technology needed for the observation modes of the Giant Magellan Telescope1.
R. Demers, F. Quirós-Pacheco, Patricio Schurter, Bo Xin, J. Haddad, Jordi Molgó, William Schoenell, Rod Conan, Rodrigo Romano, A. Bouchez, Marcos A. van Dam, Daniel Catropa, J. Kansky, Brian Mcleod, S. McMuldroch, William Podgorski, Mark Witinski, Laird M. Close, V. Gasho, S. Haffert, A. Hedglen, M. Kautz, J. Males, C. Plantet, Alfio T. Puglisi, Fabio Rossi, A. Cheffot, Nicolò Azzaroli, L. Carbonaro, T. Lapucci, E. Pinna, Simone Esposito, C. d’Orgeville, Noelia Mart́ınez Rey, T. Travouillon, B. Nemati, Guillermo Gonzalez, Joel Nissen   +37 more
semanticscholar   +1 more source

Modeling of the optical piston: Density-wave shape and resonance-fluorescence effects

Physical Review A, 1988
We present results of a numerical model of the optical piston driven by laser-induced drift (LID). The model is based on a drift-velocity formulation of Lawandy, derived from an asymmetric-random-walk argument, and includes resonance-fluorescence effects. The model is applied primarily to the experimental conditions of H. G. C.
M.T. Perkins, D. Frezzo, Nabil M. Lawandy, Joseph M. Calo   +3 more
openaire   +3 more sources

The MICADO first light imager for the ELT: starting manufacturing of the relay optics

Astronomical Telescopes + Instrumentation
MICADO is the Multi-AO Imaging Camera for Deep Observations, a first light instrument for the Extremely Large Telescope (ELT). The instrument will be assisted by a Single-Conjugate Adaptive Optics (SCAO) system and the Multiconjugate adaptive Optics ...
S. Barboza, André Boné, R. Rohloff, Friedrich Müller, R. Hofferbert, José Ramos, J. Pott, Norbert Münch, Armin Böhn, Tobias Stadler, Tobias Maurer, P. Bizenberger, David Serrano, Wolfram Schlossmacher, Helmut Espig, James Mulherin, Christopher Hall, Michael Demarco   +17 more
semanticscholar   +1 more source

Software development and integration of an adaptive-optics testbed using the Giant Magellan Telescope software frameworks

Astronomical Telescopes + Instrumentation
The Giant Magellan Telescope (GMT) is a next-generation ground-based segmented telescope. In the last few years, significant progress has been made by the GMT team and partners to design a natural guide-star wavefront control strategy that can reliably ...
Jordi Molgó, William Schoenell, J. Filgueira, F. Quirós-Pacheco, Alfio T. Puglisi, Fabio Rossi, T. Lapucci, A. Bouchez, Bo Xin, Patricio Schurter, R. Demers, Laird M. Close, S. Haffert, M. Kautz, J. Males, Marianne Cox, José Soto, Chien Peng, Hector Swett, Chris Contaxis, Jorge Barrios, Gibreel El-Halabi, Paulo H. Silva   +22 more
semanticscholar   +1 more source

Analysis of piston error of an optical sparse-aperture imaging system

SPIE Proceedings, 2009
With the development of Earth and Space missions, the quest for higher spatial resolution for telescopes will turn into urgent need. Optical sparse-aperture system can be designed to obtain high resolution in astronomical object imaging with several independent small-aperture telescopes.
Yuhong Wan, Shiquan Tao, Zhuqing Jiang, Zhiwei Zhou, Juan Zhao, Dayong Wang   +5 more
openaire   +2 more sources

A piston error detection method of optical synthetic aperture system

SPIE Proceedings, 2014
The existence of phase error influences the imaging performance of optical synthetic aperture system and limits the resolution of the imaging system. The relationship between point spread function of binocular system and piston error is analyzed and the conclusion that the relation between point spread function and piston error is irrational with ...
Xiao-feng Wei, Chubin Liu, Ze-xun Geng, Chao Jiang   +3 more
openaire   +2 more sources

Piston sensing for a segmented mirror system via a digital dispersed fringe generated by wavelength tuning.

Optics Letters, 2020
A dispersed fringe sensor (DFS) is a promising approach for sensing the large-scale piston error for segmented mirror systems. In this Letter, a novel method, to the best of our knowledge, for piston sensing based on a digital dispersed fringe (DDF ...
Yongfeng Zhang, H. Xian
semanticscholar   +1 more source

Large-scale piston error detection technology for segmented optical mirrors via convolutional neural networks.

Optics Letters, 2019
In the cophasing of the segmented optical mirrors, the Shack-Hartmann wavefront sensor is not sensitive to the submirror piston error and the large range piston errors beyond the cophasing detection range of phase diversity algorithm.
Dequan Li, Shuyan Xu, Dong Wang, D. Yan
semanticscholar   +1 more source

Coupled waveguide integrated optic segment piston sensor for the GMT

2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, 2013
Integrated optic segment piston sensor (IOPS) for the Giant Magellan Telescope (GMT) uses single mode laser written waveguides to measure segment piston (axial alignment) of the GMT primary mirrors. Light in the H-band (from 1.5 to 1.6 μm) incident on each segment originating from an off-axis guide star is coupled into separate laser written single ...
Brady Espeland, Antonin Bouchez, Kristina Uhlendorf, Francis Bennet, Rodolphe Conan, Rusty Gardhouse   +5 more
openaire   +2 more sources