Dr. Xianyu Zhang Profile

Dr. Xianyu Zhang

Adaptive Optics Scientist at Large Binocular Telescope Observatory

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Author

Publications (24)

Proceedings Article | 12 September 2024 Poster + Paper

On-sky performance metric parametrization at LBTO pyramid WFS

J. Guerra, S. Ragland, B. Mechtley, G. Brusa, D. Miller, J. Power, G. Taylor, X. Zhang, E. Pinna

Proceedings Volume 13097, 130977L (2024) https://doi.org/10.1117/12.3020645

KEYWORDS: Adaptive optics, Wavefront sensors, Stars, Optical tracking, Observatories, Wavefront errors, Telescopes, Satellites, Equipment, Demodulation

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Proceedings Article | 3 September 2024 Presentation + Paper

Emerging adaptive optics facility at Large Binocular Telescope Observatory

Sam Ragland, Guido Brusa, Alessandro Cavallaro, Heejoo Choi, Juan Carlos Guerra, Tom Herbst, Michael Lefebvre, Douglas Miller, Fernando Pedichini, Jennifer Power, Joseph Shields, Mark Smithwright, Gregory Taylor, Christian Veillet, Xianyu Zhang, Roberto Biasi, Al Conrad, Laird Close, Simone Esposito, Daniele Gallieni, Elena Masciadri, Brandon Mechtley, Eliad Peretz, Enrico Pinna, Roberto Ragazzoni, Fabio Rossi, Guido Agapito, Matthieu Bec, Maria Bergomi, Thomas Bertram, Florian Briegel, Jacopo Farinato, John Hill, Daewook Kim, Luca Marafatto, Roberto Piazzesi, Kalyan Radhakrishnan, Armando Riccardi

Proceedings Volume 13097, 130970L (2024) https://doi.org/10.1117/12.3019441

KEYWORDS: Adaptive optics, Telescopes, Wavefront sensors, Equipment, Actuators, Observatories, Cameras, Wavefronts, Stars, Metrology

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The Large Binocular Telescope (LBT) Observatory pioneered Adaptive Optics (AO) technologies such as Adaptive Secondary Mirror (ASM), Pyramid wavefront sensor, and Ground-layer AO using Rayleigh lasers at 8 to 10m class telescopes. We have initiated an effort to turn LBT AO into a facility-class capability. The effort involves (1) building an AO team with AO development capability, (2) improving the robustness of the AO, (3) developing in-house AO expertise to maintain and troubleshoot the AO systems, (4) automating processes for efficient on-sky operation, (5) tracking performance metrics and cultivating accountability for on-sky AO performance, and (6) minimizing the operational risks for the ASMs. We present the status of these developments. LBTO continues its efforts to develop innovative technology. We explore the next phase of AO developments, including Agile Extreme Adaptive Optics (AgXAO) on the DX side of the LINC-NIRVANA optical bench to overcome the limitation imposed by varying and large atmospheric seeing at Mount Graham. AgXAO implementation includes the development of (1) a high-order, high-sensitivity wavefront sensor, (2) a high-density deformable mirror with 3000 actuators and next-generation ASM with about 950 actuators, (3) active optics integration, (4) vibration and wavefront piston control, (5) atmospheric turbulence measurements and weather forecast integration, and (6) a visible camera and an AO-corrected narrow-field fiber-coupled IFU spectrograph using one of the existing workhorse visible spectrographs. Developing AgXAO on the SX side, too, would enable Fizeau imaging in the visible wavelengths. AgXAO will also serve as a general-purpose high-contrast (and subsequently a Fizeau imaging) Testbed on LBT to test advanced wavefront control algorithms, including astrophotonics experiments, and machine learning algorithms with minimal impact on routine science operations. We propose developing AgXAO through student projects to train the next-generation scientists and engineers for the extremely large telescope (ELT) era. The ultimate goal is to push large aperture ground-based telescopes to their performance limits and make them competitive with space telescopes in terms of PSF stability and performance to enable breakthrough science.

Proceedings Article | 27 August 2024 Presentation + Paper

Adaptive secondary mirrors at the Large Binocular Telescope recent updates

G. Brusa, X. Zhang, M. Lefebvre, M. Tintori, M. Smithwright, J. Guerra, D. Miller, G. Taylor, S. Ragland

Proceedings Volume 13097, 130972M (2024) https://doi.org/10.1117/12.3020323

KEYWORDS: Actuators, Telescopes, Adaptive optics, Adaptive mirrors, Optical surfaces, Wavefront errors, Control systems, Safety, Design, Wind speed

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Proceedings Article | 27 August 2024 Poster + Paper

AO functionalities improvements with the adaptive secondary mirrors at the Large Binocular Telescope

Xianyu Zhang, Guido Brusa, Douglas Miller, Juan Carlos Guerra, Gregory Taylor, Armando Riccardi, Sam Ragland

Proceedings Volume 13097, 1309780 (2024) https://doi.org/10.1117/12.3020314

KEYWORDS: Adaptive optics, Telescopes, Actuators, Adaptive mirrors, Optical aberrations, Wavefront sensors, Equipment, Wavefronts, Wavefront aberrations, Point spread functions

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Proceedings Article | 14 December 2020 Presentation

Adaptive optics all the time at the LBTO

Julian Christou, Christian Veillet, Douglas Miller, Guido Brusa, Alessandaro Cavallaro, Gregory Taylor, Laura Funk, Al Conrad, Gustavo Rahmer, Xianyu Zhang, Shane Walsh, Steve Ertel, Enrico Pinna, Simone Esposito

Proceedings Volume 11448, 1144824 (2020) https://doi.org/10.1117/12.2562443

KEYWORDS: Adaptive optics, Calibration, Mirrors, Wavefront sensors, Image quality, Reliability, Actuators, Wavefronts, Matrices

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Proceedings Article | 13 December 2020 Poster + Paper

Adaptive secondary mirrors performance and reliability improvements at the Large Binocular Telescope

Xianyu Zhang, Guido Brusa, Douglas Miller, Matthieu Bec, Julian Christou, Armando Riccardi, Marco Xompero

Proceedings Volume 11448, 114485O (2020) https://doi.org/10.1117/12.2560850

KEYWORDS: Telescopes, Reliability, Mirrors, Failure analysis, Adaptive optics, Algorithm development, Complex systems, Actuators, Databases, Interfaces

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Proceedings Article | 13 December 2020 Poster + Paper

Adaptive secondary mirrors upgrades at the Large Binocular Telescope

Guido Brusa, Xianyu Zhang, Michael Lefebvre, Julian Christou, Albert Conrad, Roberto Biasi, Mario Andrighettoni, Martin Glück, Moritz Straub, Jörg-Uwe Pott

Proceedings Volume 11448, 114485T (2020) https://doi.org/10.1117/12.2563092

KEYWORDS: Telescopes, Mirrors, Interferometers, Control systems, Electronics, Adaptive optics, Cameras, New and emerging technologies, Reliability, Signal attenuation

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Proceedings Article | 13 July 2018 Presentation + Paper

Adaptive optics systems at the Large Binocular Telescope: status, upgrades, and improvements

Julian Christou, Guido Brusa, Al Conrad, John Hill, Douglas Miller, Gustavo Rahmer, Gregory Taylor, Christian Veillet, Xianyu Zhang

Proceedings Volume 10703, 107030A (2018) https://doi.org/10.1117/12.2312782

KEYWORDS: Adaptive optics, Telescopes, Stars, Interferometry, Cameras, Mirrors, Sensors, Electronic support measures, Actuators, Spectroscopy

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Proceedings Article | 10 July 2018 Presentation + Paper

Progress on solar multi-conjugate adaptive optics at the New Vacuum Solar Telescope

Changhui Rao, Lanqiang Zhang, Lin Kong, Xuejun Rao, Youming Guo, Hua Bao, Libo Zhong, Lei Zhu, Xue'an Ma, Mei Li, Cheng Wang, Xiaojun Zhang, Xinlong Fan, Donghong Chen, Xiaoyun Wang, Zhongyi Feng, Xianyu Zhang

Proceedings Volume 10703, 107030G (2018) https://doi.org/10.1117/12.2310124

KEYWORDS: Adaptive optics, Solar telescopes, Wavefront sensors, Digital signal processing, Telescopes, Observatories, Turbulence, Field programmable gate arrays, Wavefronts, Image resolution

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Proceedings Article | 4 August 2016 Paper

Progress in multi-conjugate adaptive optics at Big Bear Solar Observatory

Dirk Schmidt, Nicolas Gorceix, Jose Marino, Thomas Berkefeld, Thomas Rimmele, Xianyu Zhang, Friedrich Wöger, Phil Goode

Proceedings Volume 9909, 990929 (2016) https://doi.org/10.1117/12.2232087

KEYWORDS: Adaptive optics, Wavefront sensors, Observatories, Telescopes, Turbulence, Adaptive optics, Observatories, Solar telescopes, Electroluminescent displays, Relays, Deformable mirrors, Mirrors

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Proceedings Article | 27 July 2016 Paper

Adaptive optics operations at the Large Binocular Telescope Observatory

Douglas Miller, Gregory Taylor, Julian Christou, Xianyu Zhang, Guido Brusa Zappellini, Gustavo Rahmer, Michael Lefebvre, Alfio Puglisi, Enrico Pinna, Simone Esposito

Proceedings Volume 9909, 99092G (2016) https://doi.org/10.1117/12.2234324

KEYWORDS: Adaptive optics, Telescopes, Observatories, Stars, Mirrors, Actuators, Monochromatic aberrations, Calibration, Sensors, Active optics

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Proceedings Article | 27 July 2016 Paper

Adaptive optics capabilities at the Large Binocular Telescope Observatory

J. Christou, G. Brusa, A. Conrad, S. Esposito, T. Herbst, P. Hinz, J. Hill, D. Miller, S. Rabien, G. Rahmer, G. Taylor, C. Veillet, X. Zhang

Proceedings Volume 9909, 99092E (2016) https://doi.org/10.1117/12.2231783

KEYWORDS: Adaptive optics, Telescopes, Imaging systems, Mirrors, Stars, Optical benches, Sensors, Interferometry, Cameras, Point spread functions

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Proceedings Article | 26 July 2016 Paper

Engineering aspects of the Large Binocular Telescope Observatory adaptive optics systems

Guido Brusa, Dave Ashby, Julian Christou, Jonathan Kern, Michael Lefebvre, Tom McMahon, Douglas Miller, Gustavo Rahmer, Richard Sosa, Gregory Taylor, Conrad Vogel, Xianyu Zhang

Proceedings Volume 9909, 990903 (2016) https://doi.org/10.1117/12.2234733

KEYWORDS: Adaptive optics, Telescopes, Sensors, Mirrors, Calibration, Control systems, Actuators, Coating, Observatories, Interferometers

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Proceedings Article | 21 July 2014 Paper

Optical design of the Big Bear Solar Observatory's multi-conjugate adaptive optics system

Xianyu Zhang, Nicolas Gorceix, Dirk Schmidt, Philip Goode, Wenda Cao, Thomas Rimmele, Roy Coulter

Proceedings Volume 9148, 914850 (2014) https://doi.org/10.1117/12.2055561

KEYWORDS: Mirrors, Wavefront sensors, Adaptive optics, Optical design, Solar telescopes, Observatories, Electroluminescent displays, Light sources, Telescopes, Modulation transfer functions

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Proceedings Article | 21 July 2014 Paper

The multi-conjugate adaptive optics system of the New Solar Telescope at Big Bear Solar Observatory

Dirk Schmidt, Nicolas Gorceix, Xianyu Zhang, Jose Marino, Roy Coulter, Sergey Shumko, Phil Goode, Thomas Rimmele, Thomas Berkefeld

Proceedings Volume 9148, 91482U (2014) https://doi.org/10.1117/12.2055146

KEYWORDS: Adaptive optics, Wavefront sensors, Deformable mirrors, Electroluminescent displays, Cameras, Solar telescopes, Observatories, Control systems, Actuators, Telescopes

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SPIE Journal Paper | 6 February 2013

LINC-NIRVANA for the large binocular telescope: setting up the world’s largest near infrared binoculars for astronomy

Ralph Hofferbert, Harald Baumeister, Thomas Bertram, Jürgen Berwein, Peter Bizenberger, Armin Böhm, Michael Böhm, José Luis Borelli, Matthieu Brangier, Florian Briegel, Albert Conrad, Fulvio De Bonis, Roman Follert, Thomas Herbst, Armin Huber, Frank Kittmann, Martin Kürster, Werner Laun, Ulrich Mall, Daniel Meschke, Lars Mohr, Vianak Naranjo, Aleksei Pavlov, Jorg-Uwe Pott, Hans-Walter Rix, Ralf-Rainer Rohloff, Eva Schinnerer, Clemens Storz, Jan Trowitzsch, Zhaojun Yan, Xianyu Zhang, Andreas Eckart, Matthew Horrobin, Steffen Rost, Christian Straubmeier, Imke Wank, Jens Zuther, Udo Beckmann, Claus Connot, Matthias Heininger, Karl-Heinz Hofmann, Tim Kroner, Edmund Nussbaum, Dieter Schertl, Gerd Weigelt, Maria Bergomi, Alessandro Brunelli, Marco Dima, Jacopo Farinato, Demetrio Magrin, Luca Marafatto, Roberto Ragazzoni, Valentina Viotto, Carmelo Arcidiacono, Giovanni Bregoli, Paolo Ciliegi, Giuseppe Cosentino, Emiliano Diolaiti, Italo Foppiani, Matteo Lombini, Laura Schreiber, Francesco D'Alessio, Gianluca Li Causi, Dario Lorenzetti, Fabrizio Vitali, Mario Bertero, Patrizia Boccacci, Andrea La Camera

OE, Vol. 52, Issue 08, 081602, (February 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.8.081602

KEYWORDS: Telescopes, Sensors, Mirrors, Interferometry, Near infrared, Adaptive optics, Interfaces, Cameras, Optical engineering, Astronomy

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Proceedings Article | 24 October 2012 Paper

LINC-NIRVANA for the LBT: setting up the world's largest NIR binoculars for astronomy

Ralph Hofferbert, Harald Baumeister, Thomas Bertram, Jürgen Berwein, Peter Bizenberger, Armin Böhm, Michael Böhm, José Luis Borelli, Matthieu Brangier, Florian Briegel, Albert Conrad, Fulvio De Bonis, Roman Follert, Tom Herbst, Armin Huber, Frank Kittmann, Martin Kürster, Werner Laun, Ulrich Mall, Daniel Meschke, Lars Mohr, Vianak Naranjo, Aleksei Pavlov, Jörg-Uwe Pott, Hans-Walter Rix, Ralf-Rainer Rohloff, Eva Schinnerer, Clemens Storz, Jan Trowitzsch, Zhaojun Yan, Xianyu Zhang, Andreas Eckart, Matthew Horrobin, Steffen Rost, Christian Straubmeier, Imke Wank, Jens Zuther, Udo Beckmann, Claus Connot, Matthias Heininger, Karl-Heinz Hofmann, Tim Kröner, Eddy Nussbaum, Dieter Schertl, Gerd Weigelt, Maria Bergomi, Alessandro Brunelli, Marco Dima, Jacopo Farinato, Demetrio Magrin, Luca Marafatto, Roberto Ragazzoni, Valentina Viotto, Carmelo Arcidiacono, Giovanni Bregoli, Paolo Ciliegi, Guiseppe Cosentino, Emiliano Diolaiti, Italo Foppiani, Matteo Lombini, Laura Schreiber, Francesco D'Alessio, Gianluca Li Causi, Dario Lorenzetti, Fabrizio Vitali, Mario Bertero, Patrizia Boccacci, Andrea La Camera

Proceedings Volume 8511, 85110A (2012) https://doi.org/10.1117/12.928284

KEYWORDS: Telescopes, Mirrors, Sensors, Interferometry, Cameras, Adaptive optics, Near infrared, Stars, Imaging systems, Interfaces

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Proceedings Article | 15 October 2012 Paper

Large field-of-view configurations for large-telescope adaptive optics systems: advantages and tradeoffs

Xianyu Zhang, Thomas Herbst, Changhui Rao, Peter Bizenberger, Albert Conrad, Carmelo Arcidiacono, Wolfgang Gaessler, Roberto Ragazzoni, Thomas Bertram

Proceedings Volume 8415, 841507 (2012) https://doi.org/10.1117/12.977706

KEYWORDS: Adaptive optics, Wavefront sensors, Stars, Mirrors, Telescopes, Charge-coupled devices, Large telescopes, Atmospheric turbulence, Sensors, Turbulence

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Proceedings Article | 15 October 2012 Paper

Measurement of non-common path static aberrations in an interferometric camera by phase diversity

Zhaojun Yan, Thomas Herbst, Pengqian Yang, Peter Bizenberger, Xianyu Zhang, Albert Conrad, Thomas Bertram, Martin Kuerster, Hans-Walter Rix, Xinyang Li, Changhui Rao

Proceedings Volume 8417, 841726 (2012) https://doi.org/10.1117/12.974523

KEYWORDS: Cameras, Adaptive optics, Interferometry, Sensors, Channel projecting optics, Optical testing, Computer simulations, Imaging systems, Phase interferometry, Telescopes

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Proceedings Article | 15 October 2012 Paper

LINC-NIRVANA: cryogenic optics for diffraction limited beam combination

Peter Bizenberger, Harald Baumeister, Tom Herbst, Xianyu Zhang

Proceedings Volume 8415, 84150Q (2012) https://doi.org/10.1117/12.977782

KEYWORDS: Mirrors, Telescopes, Optics manufacturing, Aluminum, Sensors, Interferometers, Beam splitters, Polishing, Wavefronts, Diffraction

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Proceedings Article | 13 September 2012 Paper

Pupil rotation compensation for LINC-NIRVANA

Matthieu Brangier, Albert Conrad, Thomas Bertram, Xianyu Zhang, Juergen Berwein, Florian Briegel, Thomas Herbst, Roberto Ragazzoni

Proceedings Volume 8447, 84472U (2012) https://doi.org/10.1117/12.927121

KEYWORDS: Adaptive optics, Sensors, Deformable mirrors, Control systems, Interferometry, Imaging systems, CCD image sensors, Charge-coupled devices, Wavefront sensors, Infrared telescopes

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Proceedings Article | 13 September 2012 Paper

LINC-NIRVANA Pathfinder: testing the next generation of wave front sensors at LBT

Albert Conrad, Carmelo Arcidiacono, Harald Baumeister, Maria Bergomi, Thomas Bertram, Juergen Berwein, Chris Biddick, Peter Bizenberger, Matthieu Brangier, Florian Briegel, Alessandro Brunelli, Joar Brynnel, Lorenzo Busoni, Norm Cushing, Fulvio De Bonis, Michele De La Pena, Simone Esposito, Jacopo Farinato, Luca Fini, Richard Green, Tom Herbst, Ralph Hofferbert, Frank Kittmann, Martin Kuerster, Werner Laun, Daniel Meschke, Lars Mohr, Aleksei Pavlov, Jorg-Uwe Pott, Alfio Puglisi, Roberto Ragazzoni, Andrew Rakich, Ralf-Rainer Rohloff, Jan Trowitzsch, Valentina Viotto, Xianyu Zhang

Proceedings Volume 8447, 84470V (2012) https://doi.org/10.1117/12.925650

KEYWORDS: Stars, Adaptive optics, Wavefronts, Calibration, Charge-coupled devices, Mirrors, Cameras, Infrared cameras, CCD cameras, Wavefront sensors

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Proceedings Article | 13 September 2012 Paper

The LINC-NIRVANA high layer wavefront sensor laboratory experiment: progress report

Xianyu Zhang, Albert Conrad, Daniel Meschke, Thomas Bertram, Thomas Herbst, Carmelo Arcidiacono, Peter Bizenberger, Wolfgang Gaessler, Laura Schreiber, Roberto Ragazzoni, Martin Kuerster, Fulvio De Bonis, Lars Mohr, Jacopo Farinato, Emiliano Diolaiti, Hans-Walter Rix, Changhui Rao, Florian Briegel, Frank Kittmann, Juergen Berwein, Jan Trowitzsch, Matthieu Brangier

Proceedings Volume 8447, 84476H (2012) https://doi.org/10.1117/12.926304

KEYWORDS: Stars, Wavefront sensors, Adaptive optics, Deformable mirrors, Telescopes, Calibration, Mirrors, Cameras, Astronomy, Atmospheric optics

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Proceedings Article | 29 July 2010 Paper

An atmospheric turbulence generator for dynamic tests with LINC-NIRVANA's adaptive optics system

D. Meschke, P. Bizenberger, W. Gaessler, X. Zhang, L. Mohr, H. Baumeister, E. Diolaiti

Proceedings Volume 7736, 773646 (2010) https://doi.org/10.1117/12.856933

KEYWORDS: Adaptive optics, Stars, Atmospheric turbulence, Telescopes, Wavefront sensors, Optical design, Atmospheric optics, Optical fabrication, Sensors, Light sources

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Showing 5 of 24 publications

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