Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Nazim A. Bharmal"'
Autor:
Carlos Gonzalez-Gutierrez, Nazim Ali Bharmal, Jorge Rodriguez-Muro, Alejandro Buendia-Roca, Huizhe Yang, Laurence W. Fitzpatrick, Timothy J. Morris, Francisco Javier de Cos Juez
Publikováno v:
International Journal of Optomechatronics, Vol 18, Iss 1 (2024)
Laser guide stars in astronomical adaptive optics systems have the focus anisoplanatism problem, especially for telescopes larger than 4 m in diameter. The Projected Pupil Plane Pattern (PPPP) offers an alternative solution by projecting a collimated
Externí odkaz:
https://doaj.org/article/3aa22cebe8024eb6af28c54680ed8cc4
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 497:4580-4586
Adaptive optics (AO) is widely used in ground-based telescopes to compensate the effects of atmosphere distortion, and the wavefront sensor is a significant component in the AO systems. The plenoptic wavefront sensor has been proposed as an alternati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce5d9f54022f74a9bd6222c0a3a3809f
https://doi.org/10.1093/mnras/staa2269
https://doi.org/10.1093/mnras/staa2269
Autor:
Carlos González-Gutiérrez, Nazim Ali Bharmal, Jorge Rodríguez Muro, Francisco Javier de Cos Juez
Publikováno v:
Imaging and Applied Optics Congress 2022 (3D, AOA, COSI, ISA, pcAOP).
A broad collimated laser beam and a pair of cameras combined with deep learning, helps to characterize atmospheric effects when observing distant objects with a telescope or the possible effects in ground communications.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::745d7fbaef47e189cc594c1376da4921
https://doi.org/10.1364/aoa.2022.of2b.5
https://doi.org/10.1364/aoa.2022.of2b.5
Publikováno v:
Applied Optics, 2022, Vol.61(14), pp.4160-4167 [Peer Reviewed Journal]
Comisión Nacional de Investigación Científica y Tecnológica (72160371); Science and Technology Facilities Council (ST/L00075X/1, ST/L002213/1, ST/P000541/1, ST/T000244/1). The direct detection and imaging of exoplanets requires the use of high-co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae5f26e06bb0101ebd5d261ddf32ed5f
https://doi.org/10.1364/AO.439569
https://doi.org/10.1364/AO.439569
Autor:
Nazim A. Bharmal, David Bramall, Ariadna Z. Calcines Rosario, Timothy J. Morris, Jürgen Schmoll, Lazar Staykov
Publikováno v:
Schreiber, Laura & Schmidt, Dirk & Vernet, Elise (Eds.). Proceedings Volume 12185, Adaptive Optics Systems VIII; SPIE Astronomical Telescopes + Instrumentation. : SPIE
WIVERN is a testbed for laboratory experiments in laser-based wavefront sensing. It emulates laser uplink from a 4m telescope with 1.6 arcsec seeing and laser back-scattering from up to 20 km. Currently there are three current wavefront sensing capab
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c5e59476cc415c7ae321134e675114b7
https://doi.org/10.1117/12.2629888
https://doi.org/10.1117/12.2629888
Publikováno v:
Applied Optics, 2021, Vol.60(14), pp.4208-4216 [Peer Reviewed Journal]
The plenoptic wavefront sensor (PlWFS) has been proposed as being suitable for operating on extended objects in adaptive optics (AO) systems. We propose a new self-referencing method that uses the cell image of PlWFS as a correlation reference and en
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf77afaa98590230586687ca1382d54e
https://pubmed.ncbi.nlm.nih.gov/33983176
https://pubmed.ncbi.nlm.nih.gov/33983176
Autor:
Jonathan Crass, Brian Sands, Andrew Bechter, Theodoros Anagnos, Jennifer Power, Martin Glück, Philipp Hottinger, Andreas Quirrenbach, Robert J. Harris, Alastair Basden, Philipp-Immanuel Dietrich, Matthias Blaicher, Philip L. Neureuther, Nazim Ali Bharmal, Oliver Sawodny, Tim Morris, Jörg-Uwe Pott, Jochen Heidt, Christian Koos
Publikováno v:
Journal of the Optical Society of America B, 2021, Vol.38(9) [Peer Reviewed Journal]
We present the first on-sky results of the micro-lens ring tip-tilt (MLR-TT) sensor. This sensor utilizes a 3D printed micro-lens ring feeding six multi-mode fibers to sense misaligned light, allowing centroid reconstruction. A tip-tilt mirror allows
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::51f6b5e584c8e6efe93c5ccd20747512
Autor:
Santiago Barboza, Phillip Hottinger, James Osborn, Robert R. Thomson, Calum A. Ross, Andrea Bianco, Tim Morris, Pascal Maier, Norbert Muench, E. M. Redaelli, Alessio Zanutta, Henri-François Raynaud, Caroline Kulcsár, Nazim Ali Bharmal, David Guillaume MacLachlan, Matthias Blaicher, Lisa Bardou, Tim A. Birks, Sebastiaan Y. Haffert, Léonard Prengère, Eric Gendron, Theodoros Anagnos, Christoph U. Keller, Baptiste Sinquin, Itandehui Gris-Sánchez, Aurélien Benoit, Giulio Riva, Yilin Xu, Ignas Snellen, Robert J. Harris, Lazar Staykov, Fraser A. Pike, Mareike Trappen, Christian Koos
Publikováno v:
Journal of Astronomical Telescopes Instruments and Systems
Journal of Astronomical Telescopes Instruments and Systems, Society of Photo-optical Instrumentation Engineers, 2020, 6, pp.045007. ⟨10.1117/1.JATIS.6.4.045007⟩
Journal of Astronomical Telescopes, Instruments, and Systems
Journal of Astronomical Telescopes, Instruments, and Systems, 6(4), 045007
Journal of Astronomical Telescopes Instruments and Systems, Society of Photo-optical Instrumentation Engineers, 2020, 6, pp.045007. ⟨10.1117/1.JATIS.6.4.045007⟩
Journal of Astronomical Telescopes, Instruments, and Systems
Journal of Astronomical Telescopes, Instruments, and Systems, 6(4), 045007
Direct imaging instruments have the spatial resolution to resolve exoplanets from their host star. This enables direct characterization of the exoplanets atmosphere, but most direct imaging instruments do not have spectrographs with high enough resol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5a9badf4f898c16ecfbbba0799025cb
https://hdl.handle.net/1887/3133844
https://hdl.handle.net/1887/3133844
Autor:
Tristan Buey, Lisa Bardou, Clément Schotte, M. Cohen, Nicolas Dubost, Lazar Staykov, Nazim Ali Bharmal, James Osborn, Eric Gendron, Magali Loupias, Fanny Chemla, Michel Tallon, Maud Langlois, Tim Morris
Publikováno v:
Adaptive Optics Systems VII
Adaptive Optics Systems VII, Dec 2020, Online Only, United States. pp.1144819, ⟨10.1117/12.2561326⟩
Adaptive Optics Systems VII, Dec 2020, Online Only, United States. pp.1144819, ⟨10.1117/12.2561326⟩
Funding: Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) (72160371); UK Research and Innovation Science and Technology Facilities Council (STFC) (ST/L002213/1, ST/L00075X/1, ST/P000541/1, ST/T000244/1). Point-diffraction int
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1610289e57f5a86f6c8176ef168ec041
https://hal.archives-ouvertes.fr/hal-03453938
https://hal.archives-ouvertes.fr/hal-03453938
Autor:
Tim Morris, D. Bonaccini Calia, Simone Esposito, Carlos Correia, I. Montilla, Maritza Reyes, James Osborn, T. Fusco, Caroline Kulcsár, Lisa Bardou, Eric Gendron, Lazar Staykov, Gérard Rousset, Jean-Luc Beuzit, Benoit Neichel, Nazim Ali Bharmal, Paulo J. V. Garcia
Publikováno v:
Adaptive Optics Systems VII
Adaptive Optics Systems VII, Dec 2020, Online Only, Japan. pp.181, ⟨10.1117/12.2562805⟩
Adaptive Optics Systems VII, Dec 2020, Online Only, United States. pp.181, ⟨10.1117/12.2562805⟩
Adaptive Optics Systems VII, Dec 2020, Online Only, Japan. pp.181, ⟨10.1117/12.2562805⟩
Adaptive Optics Systems VII, Dec 2020, Online Only, United States. pp.181, ⟨10.1117/12.2562805⟩
International audience; On-sky testing of new instrumentation concepts is required before they can be incorporated within facility-class instrumentation with certainty that they will work as expected within a real telescope environment. Increasingly,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e081c8cc6159b07125b7bf3c97a5b7f3
https://hal.archives-ouvertes.fr/hal-03444582
https://hal.archives-ouvertes.fr/hal-03444582