Results 201 to 210 of about 345,237 (255)

In situ pressure calibration for piston cylinder cells via ruby fluorescence with fiber optics

Review of Scientific Instruments, 2007
K Koyama-Nakazawa, Masahito Koeda, Masato Hedo, Yoshiya Uwatoko   +3 more
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Compact spectral pulse shaping using hybrid planar lightwave circuit and free-space optics with MEMS piston micromirrors and spectrogram feedback control

The 17th Annual Meeting of the IEEELasers and Electro-Optics Society, 2004. LEOS 2004., 2004
David Moalem Maron, C. Dorrer, Ilnam Kang, C.R. Doerr, M. Cappuzzo, L. Gomez, E. Chen, A. Wong-Foy, E.J. Laskowski, F. Klemens, Cristian Bolle, Raymond A. Cirelli, E. Ferry, T. Sorsch, J.F. Miner, E. Bower, M.E. Simon, F. Pardo, Daniel López   +18 more
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Adaptive optics for array telescopes using piston-and-tilt wave-front sensing

Applied Optics, 1992
Peter Wizinowich, B. A. McLeod, Michael Lloyd‐Hart, J. R. P. Angel, D. Colucci, R. Dekany, Donald McCarthy, David Wittman, Ian Scott‐Fleming   +8 more
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CMOS-Integrable Piston-Type Micro-Mirror Array for Adaptive Optics Made of Mono-Crystalline Silicon using 3-D Integration

2009 IEEE 22nd International Conference on Micro Electro Mechanical Systems, 2009
Martin Lapisa, Fabian Zimmer, Frank Niklaus, Andreas Gehner, Göran Stemme   +4 more
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Model-based large-dynamic iterative piston correction using extended objects.

Optics Letters, 2023
Cophasing is crucial for segmented or sparse aperture telescopes to achieve high resolution. In this Letter, we propose a novel, to the best of our knowledge, model-based piston correction method that can remove large-scale piston errors within a few ...
Zexia Zhang, Bing Dong
semanticscholar   +1 more source

A phase retrieval technique to measure and correct residual segment piston errors of large aperture optical telescopes

Astronomical Telescopes + Instrumentation, 2022
The success of the Keck telescopes’ segmented mirror technology provided a basis for the development of other large and extremely large telescopes. We investigate ways to optimize the performance of the segmented mirror telescope further to (1) take on ...
S. Ragland, L. Gers
semanticscholar   +1 more source

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

Design and development of a 331-segment tip–tilt–piston mirror array for space-based adaptive optics

, 2007
Jason B. Stewart, Thomas G. Bifano, Steven Cornelissen, Paul Bierden, B. M. Levine, T. Cook   +5 more
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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