Results 171 to 180 of about 325,753 (218)

Lab tests of segment/petal phasing with a pyramid wavefront sensor and a holographic dispersed fringe sensor in turbulence with the Giant Magellan Telescope high contrast adaptive optics phasing testbed

Journal of Astronomical Telescopes Instruments and Systems, 2022
. The Giant Magellan Telescope (GMT) design consists of seven circular 8.4-m diameter mirrors, together forming a single 25.4-m diameter primary mirror. This large aperture and collecting area can help extreme adaptive optics (ExAO) systems such as GMT’s
A. Hedglen, L. Close, S. Haffert, J. Males, M. Kautz, A. Bouchez, R. Demers, F. Quirós-Pacheco, B. Sitarski, O. Guyon, Kyle Van Gorkom, J. Long, J. Lumbres, L. Schatz, K. Miller, A. Rodack, J. Knight   +16 more
semanticscholar   +1 more source

Piston-tip-tilt mirror array in the wide field phasing testbed for the Giant Magellan Telescope

Astronomical Telescopes + Instrumentation, 2022
The Wide Field Phasing Testbed (WFPT) will be used to test phasing and active optics systems planned for the doubly segmented Giant Magellan Telescope (GMT). The testbed consists of a set of optical relays including segmented and deformable mirrors (DMs)
Daniel Catropa, B. McLeod, Joseph D'Arco, Daniel Durusky, J. Kansky, S. McMuldroch, W. Podgorski, MattR. Smith, Joseph M. Zajac, A. Bouchez, Glenn Brossus, R. Demers, F. Quirós-Pacheco, P. Schurter, B. Sitarski   +14 more
semanticscholar   +1 more source

Differential piston sensing with LIFT: application to the GMT

Astronomical Telescopes + Instrumentation, 2022
The Giant Magellan Telescope’s primary and deformable secondary mirror are each composed of 7 segments. The Natural Guide Star (NGS) wavefront sensor has the critical task to keep these 7 segments in phase in addition to the classical Adaptive Optics (AO)
A. Cheffot, C. Plantet, E. Pinna, S. Esposito, Nicolò Azzaroli, F. Rossi, M. Bonaglia, A. Puglisi, T. Lapucci, L. Carbonaro, F. Quirós-Pacheco, M. V. van Dam, A. Bouchez, R. Demers   +13 more
semanticscholar   +1 more source

First lab results of segment/petal phasing with a pyramid wavefront sensor and a novel holographic dispersed fringe sensor (HDFS) from the Giant Magellan Telescope high contrast adaptive optics phasing testbed

Astronomical Telescopes + Instrumentation, 2022
The Giant Magellan Telescope (GMT) design consists of seven circular 8.4-m diameter mirror segments that are separated by large > 30 cm gaps, making them susceptible to fluctuations in optical path differences (piston) due to flexure, segment vibrations,
A. Hedglen, L. Close, S. Haffert, J. Males, M. Kautz, A. Bouchez, R. Demers, F. Quirós-Pacheco, B. Sitarski, O. Guyon, Kyle Van Gorkom, J. Long, J. Lumbres, L. Schatz, K. Miller, A. Rodack, J. Knight   +16 more
semanticscholar   +1 more source

The MICADO first light imager for the ELT: relay optics opto-mechanical final design

Astronomical Telescopes + Instrumentation, 2022
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 Multi conjugate Adaptive Optics ...
S. Barboza, A. Boné, G. Rodeghiero, R. Harris, Joshua Jost, J. Pott, R. Rohloff, F. Müller, R. Hofferbert, P. Bizenberger, J. Ramos, N. Münch, L. Mohr, Paula Stępień, Wolfram Schlossmacher, M. Müller   +15 more
semanticscholar   +1 more source

Study of the optical piston

Physical Review A, 1986
We report an experimental and theoretical study of the optical piston, a consequence of the phenomenon of light-induced drift (LID), observed in binary mixtures of Na vapor and a buffer gas. Good agreement has been found between experiment and existing theory as far as the shape of the Na density profile in the piston is concerned.
Jos E. M. Haverkort, J. P. Woerdman, H. G. C. Werij   +2 more
openaire   +3 more sources

The MICADO first light imager for the ELT: a comprehensive tolerance analysis for the relay optics

Astronomical Telescopes + Instrumentation, 2022
MICADO is the Multi-AO Imaging Camera for Deep Observations, a first light instrument for the Extremely Large Telescope (ELT). The instrument provides imaging, astrometric, spectroscopic and coronographic observing modes.
A. Boné, S. Barboza, Robert J. Harris, G. Rodeghiero, J. Pott, R. Rohloff, F. Müller, R. Hofferbert, P. Bizenberger, J. Ramos, N. Münch   +10 more
semanticscholar   +1 more source

Optical piston in glasses

Journal of Modern Optics, 2001
Abstract Light-driven electron transitions between different traps in the direction opposite to an electric force eE (e is the electron charge and E is the static electric field) are studied. We show that in Ge-doped silica fibres the electrons are transfered predominantly between different Ge centres at concentrations ≥ 10 mol.% and dominate over the ...
V. B. Antonyuk, B.P. Antonyuk
openaire   +2 more sources

Optical piston in rubidium

Optics Communications, 1987
Abstract We report observation of an optical piston due to the effect of light induced drift in a rubidium-argon mixture. A tunable semiconductor diode laser is used for diagnostics of rubidium density and isotropic ratio. Sign and magnitude of the light induced drift effect depend directly on fine and hyperfine structure of rubidium.
W. A. Hamel, A.D. Streater, J. P. Woerdman   +2 more
openaire   +2 more sources

Magneto-Optic Piston Effect

Physical Review Letters, 1999
Light-induced drift of optically active atoms in a buffer gas is a consequence of the unequal diffusive frictions suffered by the excited and the ground-state atoms. This drift can be used to create an "optical piston," which is best observed when the piston action is confined to a one-dimensional motion.
J. Singh, Rupamanjari Ghosh, Sushanta Dattagupta   +2 more
openaire   +2 more sources