Dr. Christian Dani Guzmán Profile

Dr. Christian Dani Guzmán

Chief Executive Officer at Sky-Walkers SpA

SPIE Involvement:

Author

Publications (37)

Proceedings Article | 29 August 2022 Presentation + Paper

System integration of the Potsdam Arrayed Waveguide Spectrograph (PAWS)

Eloy Hernandez, Alan Günther, Svend-Marian Bauer, Christian Dani Guzmán, Christer Sandin, Andreas Stoll, Stella Vjesnica, Kalaga Madhav, Martin M. Roth

Proceedings Volume 12184, 121841O (2022) https://doi.org/10.1117/12.2627318

KEYWORDS: Sensors, Temperature metrology, Cryocoolers, Cryogenics, Bridges, Computer aided design, Molybdenum, Spectrographs, Mirrors, Electronics

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Optomechanical design of PAWS, the Potsdam Arrayed Waveguide Spectrograph

Eloy Hernandez, Andreas Stoll, Svend-Marian Bauer, Amokrane Berdja, Rafael Bernardi, Dani Guzman, Alan Günther, Kalaga Madhav, Martin Roth, Christer Sandin, Constanza Villanueva

Proceedings Volume 11451, 114515O (2020) https://doi.org/10.1117/12.2562174

KEYWORDS: Waveguides, Spectrographs, Single mode fibers, Optical design, Telescopes, Calibration, Microscopes, Free space optics, Integrated photonics, Astronomy

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Proceedings Article | 6 July 2018 Presentation + Paper

The GMT-consortium large earth finder (G-CLEF): an optical echelle spectrograph for the Giant Magellan Telescope (GMT)

Andrew Szentgyorgyi, Daniel Baldwin, Stuart Barnes, Jacob Bean, Sagi Ben-Ami, Patricia Brennan, Jamie Budynkiewicz, Daniel Catropa, Moo-Young Chun, Charlie Conroy, Adam Contos, Jeffrey Crane, Daniel Durusky, Harland Epps, Ian Evans, Janet Evans, Valery Fishman, Anna Frebel, Thomas Gauron, Dani Guzman, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Andres Jordan, Jihun Kim, Kang-Min Kim, Yunjong Kim, Sungho Lee, Mercedes Lopez-Morales, Claudia Mendes de Oliveira, Kenneth McCracken, Stuart McMuldroch, Joseph Miller, Mark Mueller, Jae Sok Oh, Cem Onyuksel, Byeong-Gon Park, Chan Park, Sung-Joon Park, Charles Paxson, David Phillips, David Plummer, William Podgorski, Adam Rubin, Andreas Seifahrt, Daniel Stark, Joao Steiner, Alan Uomoto, Ronald Walsworth, Young-Sam Yu

Proceedings Volume 10702, 107021R (2018) https://doi.org/10.1117/12.2313539

KEYWORDS: Spectrographs, Cameras, Calibration, Telescopes, Stars, Optical benches, Thorium

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Proceedings Article | 9 August 2016 Paper

The GMT-Consortium Large Earth Finder (G-CLEF): an optical Echelle spectrograph for the Giant Magellan Telescope (GMT)

Andrew Szentgyorgyi, Daniel Baldwin, Stuart Barnes, Jacob Bean, Sagi Ben-Ami, Patricia Brennan, Jamie Budynkiewicz, Moo-Young Chun, Charlie Conroy, Jeffrey Crane, Harland Epps, Ian Evans, Janet Evans, Jeff Foster, Anna Frebel, Thomas Gauron, Dani Guzmán, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Andres Jordan, Jihun Kim, Kang-Miin Kim, Claudia Mendes Mendes de Oliveira, Mercedes Lopez-Morales, Kenneth McCracken, Stuart McMuldroch, Joseph Miller, Mark Mueller, Jae Sok Oh, Cem Onyuksel, Mark Ordway, Byeong-Gon Park, Chan Park, Sung-Joon Park, Charles Paxson, David Phillips, David Plummer, William Podgorski, Andreas Seifahrt, Daniel Stark, Joao Steiner, Alan Uomoto, Ronald Walsworth, Young-Sam Yu

Proceedings Volume 9908, 990822 (2016) https://doi.org/10.1117/12.2233506

KEYWORDS: Spectrographs, Telescopes, Cameras, Calibration, Lamps, Interfaces, Fiber science, Light sources, Optical design, Mirrors

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Proceedings Article | 4 August 2016 Paper

Update on BOMBOLO: a 3-arm, wide-field, near-UV/optical imager for the 4-meter SOAR telescope

Eduardo Garcés, Dani Guzmán, Damien Jones, Rodolfo Angeloni, Thomas Puzia

Proceedings Volume 9908, 99084B (2016) https://doi.org/10.1117/12.2232206

KEYWORDS: Imaging systems, Mechanical engineering, Monte Carlo methods, Telescopes, Cameras, Optical design, Chemical elements, Optical components, Collimators, Mirrors

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Proceedings Article | 27 July 2016 Paper

Experimental results on using artificial neural networks for accurate centroiding in Shack-Hartmann wavefront sensors with elongated spots

Amokrane Berdja, Eduardo Garcés Santibañez, Christian Dani Guzmán

Proceedings Volume 9909, 99093Y (2016) https://doi.org/10.1117/12.2233039

KEYWORDS: Wavefront sensors, Artificial neural networks, Adaptive optics, Sodium, Sensors, Neural networks, Optical turbulence, Charge-coupled devices, Stars, Control systems

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Proceedings Article | 22 July 2016 Paper

Advanced structural design for precision radial velocity instruments

Dan Baldwin, Andrew Szentgyorgyi, Stuart Barnes, Jacob Bean, Sagi Ben-Ami, Patricia Brennan, Jamie Budynkiewicz, Moo-Young Chun, Charlie Conroy, Jeffrey Crane, Harland Epps, Ian Evans, Janet Evans, Jeff Foster, Anna Frebel, Thomas Gauron, Dani Guzman, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Andres Jordan, Jihun Kim, Kang-Min Kim, Claudia Mendes de Oliveira, Mercedes Lopez-Morales, Kenneth McCracken, Stuart McMuldroch, Joseph Miller, Mark Mueller, Jae Sok Oh, Mark Ordway, Byeong-Gon Park, Chan Park, Sung-Joon Park, Charles Paxson, David Phillips, David Plummer, William Podgorski, Andreas Seifahrt, Daniel Stark, Joao Steiner, Alan Uomoto, Ronald Walsworth, Young-Sam Yu

Proceedings Volume 9912, 99123I (2016) https://doi.org/10.1117/12.2235250

KEYWORDS: Optical benches, Spectrographs, Optical design, Composites, Telescopes, Structural design, Finite element methods, Thermography, Sensors, Optical components

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The GMT-Consortium Large Earth Finder (G-CLEF) is an echelle spectrograph with precision radial velocity (PRV) capability that will be a first light instrument for the Giant Magellan Telescope (GMT). G-CLEF has a PRV precision goal of 40 cm/sec (10 cm/s for multiple measurements) to enable detection of Earth-like exoplanets in the habitable zones of sun-like stars¹. This precision is a primary driver of G-CLEF’s structural design. Extreme stability is necessary to minimize image motions at the CCD detectors. Minute changes in temperature, pressure, and acceleration environments cause structural deformations, inducing image motions which degrade PRV precision. The instrument’s structural design will ensure that the PRV goal is achieved under the environments G-CLEF will be subjected to as installed on the GMT azimuth platform, including:

Millikelvin (0.001 °K) thermal soaks and gradients

10 millibar changes in ambient pressure

Changes in acceleration due to instrument tip/tilt and telescope slewing Carbon fiber/cyanate composite was selected for the optical bench structure in order to meet performance goals. Low coefficient of thermal expansion (CTE) and high stiffness-to-weight are key features of the composite optical bench design. Manufacturability and serviceability of the instrument are also drivers of the design.

In this paper, we discuss analyses leading to technical choices made to minimize G-CLEF’s sensitivity to changing environments. Finite element analysis (FEA) and image motion sensitivity studies were conducted to determine PRV performance under operational environments. We discuss the design of the optical bench structure to optimize stiffness-to-weight and minimize deformations due to inertial and pressure effects. We also discuss quasi-kinematic mounting of optical elements and assemblies, and optimization of these to ensure minimal image motion under thermal, pressure, and inertial loads expected during PRV observations.

Proceedings Article | 22 August 2014 Paper

Statistics of atmospheric turbulence at Cerro Pachon using the GeMS profiler

Ignacio Rodriguez, Benoit Neichel, Clémentine Béchet, Dani Guzmán, Andrés Guesalaga

Proceedings Volume 9148, 914866 (2014) https://doi.org/10.1117/12.2056665

KEYWORDS: Turbulence, Adaptive optics, Atmospheric turbulence, Telescopes, Gemini Observatory, Deconvolution, Profiling, Stars, Matrices, Statistical analysis

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Proceedings Article | 7 August 2014 Paper

Laboratory validation of a laser shaping system before guide star projection

Sebastián Zúñiga, Clémentine Béchet, Héctor González-Núñez, Benoit Neichel, Vincent Fesquet, Vincent Garrel, Pedro Escárate, Mario Castro, Dani Guzmán, Andrés Guesalaga

Proceedings Volume 9148, 91483I (2014) https://doi.org/10.1117/12.2056062

KEYWORDS: Actuators, Electroluminescent displays, Adaptive optics, Deformable mirrors, Calibration, Stars, Wavefront sensors, Mirrors, Laser guide stars, Microelectromechanical systems

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Proceedings Article | 6 August 2014 Paper

The opto-mechanical design of the GMT-consortium large earth finder (G-CLEF)

Mark Mueller, Daniel Baldwin, Jacob Bean, Henry Bergner, Bruce Bigelow, Moo-Young Chun, Jeffrey Crane, Jeff Foster, Gabor Fűrész, Thomas Gauron, Dani Guzman, Edward Hertz, Andrés Jordán, Kang-Min Kim, Kenneth McCracken, Timothy Norton, Mark Ordway, Chan Park, Sang Park, William Podgorski, Andrew Szentgyorgyi, Alan Uomoto, In-Soo Yuk

Proceedings Volume 9147, 91479A (2014) https://doi.org/10.1117/12.2056440

KEYWORDS: Spectrographs, Space telescopes, Telescopes, Cameras, Optical mounts, Composites, Temperature metrology, Mirrors, Control systems, Optical benches

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The GMT-Consortium Large Earth Finder (G-CLEF) is a fiber fed, optical echelle spectrograph that has been selected as a first light instrument for the Giant Magellan Telescope (GMT) currently under construction at the Las Campanas Observatory in Chile’s Atacama desert region. We designed G-CLEF as a general-purpose echelle spectrograph with precision radial velocity (PRV) capability used for exoplanet detection. The radial velocity (RV) precision goal of GCLEF is 10 cm/sec, necessary for detection of Earth-sized planets orbiting stars like our Sun in the habitable zone. This goal imposes challenging stability requirements on the optical mounts and the overall spectrograph support structures. Stability in instruments of this type is typically affected by changes in temperature, orientation, and air pressure as well as vibrations caused by telescope tracking. For these reasons, we have chosen to enclose G-CLEF’s spectrograph in a thermally insulated, vibration isolated vacuum chamber and place it at a gravity invariant location on GMT’s azimuth platform. Additional design constraints posed by the GMT telescope include: a limited space envelope, a thermal emission ceiling, and a maximum weight allowance. Other factors, such as manufacturability, serviceability, available technology and budget are also significant design drivers. All of the previously listed considerations must be managed while ensuring that performance requirements are achieved. In this paper, we discuss the design of G-CLEF’s optical mounts and support structures including technical choices made to minimize the system’s sensitivity to thermal gradients. A more general treatment of the properties of G-CLEF can be found elsewhere in these proceedings1. We discuss the design of the vacuum chamber which houses the irregularly shaped optical bench and optics while conforming to a challenging space envelope on GMT’s azimuth platform. We also discuss the design of G-CLEF’s insulated enclosure and thermal control systems which maintain the spectrograph at milli-Kelvin level stability while simultaneously limiting the maximum thermal emission into the telescope dome environment. Finally, we discuss G-CLEF’s front-end assembly and fiber-feed system as well as other interface challenges presented by the telescope, enclosure and neighboring instrumentation.

Proceedings Article | 28 July 2014 Paper

LOTUCE2: a dome-seeing instrument for the E-ELT

Amokrane Berdja, Dani Guzman, Norman Saez, Nicole David, Nicolás Dubost, Marc Sarazin, Aziz Ziad

Proceedings Volume 9147, 91479R (2014) https://doi.org/10.1117/12.2056270

KEYWORDS: Optical turbulence, Charge-coupled devices, Telescopes, Cameras, Turbulence, Mirrors, Domes, Point spread functions, Collimation, Optical design

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Proceedings Article | 28 July 2014 Paper

A novel systems engineering approach to the design of a precision radial velocity spectrograph: the GMT-Consortium Large Earth Finder (G-CLEF)

William Podgorski, Jacob Bean, Henry Bergner, Moo-Young Chun, Jeffrey Crane, Ian Evans, Janet Evans, Gabor Furesz, Dani Guzman, Kang-Min Kim, Kenneth McCracken, Mark Mueller, Timothy Norton, Chan Park, Sang Park, David Plummer, Andrew Szentgyorgyi, Alan Uomoto, In-Soo Yuk

Proceedings Volume 9147, 91478W (2014) https://doi.org/10.1117/12.2056329

KEYWORDS: Spectrographs, Calibration, Telescopes, Error analysis, Velocity measurements, Sensors, Adaptive optics, Cameras, Mirrors, Space telescopes

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Proceedings Article | 28 July 2014 Paper

The G-CLEF spectrograph optical design

Gábor Fűrész, Harland Epps, Stuart Barnes, William Podgorski, Andrew Szentgyorgyi, Mark Mueller, Daniel Baldwin, Jacob Bean, Henry Bergner, Moo-Young Chun, Jeffrey Crane, Janet Evans, Ian Evans, Jeff Foster, Thomas Gauron, Dani Guzman, Edward Hertz, Andres Jordán, Kang-Min Kim, Kenneth McCracken, Timothy Norton, Mark Ordway, Chan Park, Sang Park, Dave Plummer, Alan Uomoto, In-Soo Yuk

Proceedings Volume 9147, 91479G (2014) https://doi.org/10.1117/12.2057153

KEYWORDS: Mirrors, Spectrographs, Cameras, Collimators, Optical design, Telescopes, Point spread functions, Sensors, Observatories, Spectral resolution

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Proceedings Article | 28 July 2014 Paper

A preliminary design for the GMT-Consortium Large Earth Finder (G-CLEF)

Andrew Szentgyorgyi, Stuart Barnes, Jacob Bean, Bruce Bigelow, Antonin Bouchez, Moo-Young Chun, Jeffrey Crane, Harland Epps, Ian Evans, Janet Evans, Anna Frebel, Gabor Furesz, Alex Glenday, Dani Guzman, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Ueejong Jeong, Andres Jordan, Kang-Min Kim, Jihun Kim, Chih-Hao Li, Mercedes Lopez-Morales, Kenneth McCracken, Brian McLeod, Mark Mueller, Jakyung Nah, Timothy Norton, Heeyoung Oh, Jae Sok Oh, Mark Ordway, Byeong-Gon Park, Chan Park, Sung-Joon Park, David Phillips, David Plummer, William Podgorski, Florian Rodler, Andreas Seifahrt, Kyung-Mo Tak, Alan Uomoto, Marcos Van Dam, Ronald Walsworth, Young Sam Yu, In-Soo Yuk

Proceedings Volume 9147, 914726 (2014) https://doi.org/10.1117/12.2056741

KEYWORDS: Spectrographs, Telescopes, Stars, Mirrors, Calibration, Exoplanets, Adaptive optics, Cameras, Interfaces, Optical design

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Proceedings Article | 24 July 2014 Paper

BOMBOLO: A 3-arms optical imager for SOAR Observatory

Dani Guzmán, Rodolfo Angeloni, Thomas Puzia, Damien Jones, Andrés Jordán, Timo Anguita, Susan Benecchi, Eduardo Garcés

Proceedings Volume 9147, 91475V (2014) https://doi.org/10.1117/12.2056454

KEYWORDS: Cameras, Stars, Optical filters, Sensors, Telescopes, Imaging systems, Collimators, Observatories, Astronomy, Solar system

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Proceedings Article | 23 July 2014 Paper

Finite-differences model to predict temperatures on cryogenic focal plane arrays: first laboratory results

Dani Guzmán, Rodrigo Bilbeny, Andrew Szentgyorgyi, Timothy Norton

Proceedings Volume 9154, 915425 (2014) https://doi.org/10.1117/12.2056472

KEYWORDS: Fused deposition modeling, Temperature metrology, Sensors, Cryogenics, Thermal modeling, Charge-coupled devices, Design for manufacturing, CCD image sensors, Transmission electron microscopy, Advanced distributed simulations

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Proceedings Article | 21 July 2014 Paper

First on-sky results of a neural network based tomographic reconstructor: Carmen on Canary

J. Osborn, D. Guzman, F. de Cos Juez, A. Basden, T. Morris, É. Gendron, T. Butterley, R. Myers, A. Guesalaga, F. Sanchez Lasheras, M. Gomez Victoria, M. Sánchez Rodríguez, D. Gratadour, G. Rousset

Proceedings Volume 9148, 91484M (2014) https://doi.org/10.1117/12.2057462

KEYWORDS: Tomography, Adaptive optics, Calibration, Artificial neural networks, Wavefronts, Turbulence, Telescopes, Neural networks, Atmospheric optics, Optical turbulence

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Proceedings Article | 18 July 2014 Paper

ARNICA and LonGSp: the refurbishment of two near infrared instruments

Shintaro Koshida, Leonardo Vanzi, Dani Guzman, Rodrigo Leiva, Marco Bonati, Roberto Avilés, Carlo Baffa, Francesco Palla, Filippo Mannucci, Tzu Chiang Shen, Vincent Suc

Proceedings Volume 9147, 91473B (2014) https://doi.org/10.1117/12.2056115

KEYWORDS: Sensors, Telescopes, Near infrared, Control systems, Observatories, Astronomy, Signal detection, Interference (communication), Stars, Spectrographs

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Proceedings Article | 18 July 2014 Paper

Using DARC in a multi-object AO bench and in a dome seeing instrument

Norman Sáez, Alistair Basden, Dani Guzmán, Nicolás Dubost, Amokrane Berdja

Proceedings Volume 9152, 91521X (2014) https://doi.org/10.1117/12.2055590

KEYWORDS: Cameras, Adaptive optics, Control systems, Turbulence, Bone, Prototyping, Light emitting diodes, Interfaces, Stars, Software development

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Proceedings Article | 5 October 2012 Paper

The GMT-CfA, Carnegie, Catolica, Chicago Large Earth Finder (G-CLEF): a general purpose optical echelle spectrograph for the GMT with precision radial velocity capability

A. Szentgyorgyi, A. Frebel, G. Furesz, E. Hertz, T. Norton, J. Bean, H. Bergner, J. Crane, J. Evans, I. Evans, T. Gauron, A. Jordán, S. Park, A. Uomoto, S. Barnes, W. Davis, M. Eisenhower, H. Epps, D. Guzman, K. McCracken, M. Ordway, D. Plummer, W. Podgorski, D. Weaver

Proceedings Volume 8446, 84461H (2012) https://doi.org/10.1117/12.924957

KEYWORDS: Spectrographs, Cameras, Telescopes, Calibration, Optical design, Interfaces, Molybdenum, Lenses, Charge-coupled devices, Mirrors

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Proceedings Article | 13 September 2012 Paper

New results on a Cn2 profiler for GeMS

A. Cortes, B. Neichel, A. Guesalaga, J. Osborn, F. Rigaut, D. Guzman

Proceedings Volume 8447, 84475T (2012) https://doi.org/10.1117/12.925242

KEYWORDS: Turbulence, Stars, Adaptive optics, Telescopes, Gemini Observatory, Atmospheric optics, Neodymium, Monte Carlo methods, Tomography, Laser guide stars

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Proceedings Article | 13 September 2012 Paper

Improving stability, robustness, and performance of laser systems

Andres Guesalaga, Benoit Neichel, Maxime Boccas, Celine D'Orgeville, Francois Rigaut, Dani Guzman, Jaime Anguita

Proceedings Volume 8447, 84474M (2012) https://doi.org/10.1117/12.924908

KEYWORDS: Adaptive optics, Turbulence, Laser guide stars, Laser systems engineering, Telescopes, Deformable mirrors, Wavefronts, Gemini Observatory, Atmospheric optics, Near field optics

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Proceedings Article | 13 September 2012 Paper

Tomographic reconstructor for multi-object adaptive optics using artificial neural networks

Dani Guzman, Alexandre Mello, James Osborn, Francisco De Cos, Marlon Gómez, Timothy Butterley, Nicole David, Nieves Roqueñi, Richard Myers, Andrés Guesalaga, Matias Salas

Proceedings Volume 8447, 844740 (2012) https://doi.org/10.1117/12.925355

KEYWORDS: Stars, Tomography, Wavefronts, Turbulence, Adaptive optics, Artificial neural networks, Neural networks, Neurons, Device simulation, Telescopes

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Proceedings Article | 13 September 2012 Paper

Design of frequency-based controllers for vibration mitigation at the Gemini-South telescope

Andres Guesalaga, Benoit Neichel, Francois Rigaut, James Osborn, Dani Guzman

Proceedings Volume 8447, 844711 (2012) https://doi.org/10.1117/12.924909

KEYWORDS: Turbulence, Mirrors, Adaptive optics, Telescopes, Autoregressive models, Gemini Observatory, Wavefront sensors, Actuators, Optical instrument design, Linear filtering

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Proceedings Article | 28 July 2010 Paper

Deformable mirror models for open-loop adaptive optics using non-parametric estimation techniques

Dani Guzmán, Francisco Javier De Cos Juez, Richard Myers, Fernando Sánchez Lasheras, Laura Young, Andrés Guesalaga

Proceedings Volume 7736, 77361C (2010) https://doi.org/10.1117/12.856894

KEYWORDS: Mirrors, Actuators, Microelectromechanical systems, Adaptive optics, Mars, Deformable mirrors, Data modeling, Wavefronts, Interferometers, Neurons

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Proceedings Article | 28 July 2010 Paper

Status update of the CANARY on-sky MOAO demonstrator

E. Gendron, T. Morris, Z. Hubert, R. Myers, A. Longmore, G. Rousset, G. Talbot, F. Vidal, N. Dipper, D. Gratadour, N. Looker, M. Brangier, E. Younger, A. Sevin, A. Basden, D. Perret, L. Young, D. Atkinson, F. Chemla, D. Henry, T. Butterley, P. Laporte, D. Guzman, M. Marteaud, D. Geng, N. Vedrenne, M. Harrison, T. Fusco, A. Guesalaga, C. Dunlop, S. Todd, K. Dee, C. Dickson, A. Greenaway, B. Stobie, H. Dalgarno, J. Skvarc

Proceedings Volume 7736, 77360P (2010) https://doi.org/10.1117/12.857668

KEYWORDS: Telescopes, Calibration, Adaptive optics, Tomography, Mirrors, Sensors, Actuators, Device simulation, Cameras, Deformable mirrors

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Proceedings Article | 22 July 2010 Paper

Cryogenic design of the EMCCD cameras for the Brazilian tunable filter imager

Denis Andrade, Dani Guzman, Olivier Daigle, Keith Taylor, Claudia Mendez de Oliveira, Javier Ramirez Fernandez

Proceedings Volume 7742, 77421W (2010) https://doi.org/10.1117/12.856929

KEYWORDS: Cameras, Sensors, Electron multiplying charge coupled devices, Cryogenics, Tunable filters, Imaging systems, Aluminum, Interfaces, Copper, Photons

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Proceedings Article | 20 July 2010 Paper

The Brazilian tunable filter imager for SOAR

Keith Taylor, Cláudia Mendes de Oliveira, Rene Laporte, Christian Guzman, Javier Ramirez Fernandez, Sergio Scarano, Giseli Ramos, Henri Plana, Fernando Lourenco, Jean-Luc Gach, Fernando Fontes, Fabricio Ferrari, Luiz Cavalcanti, Edna Gutierrez Castañeda, Alvaro de Calasans, Philippe Balard, Philippe Amram, Denis Andrade

Proceedings Volume 7739, 77394U (2010) https://doi.org/10.1117/12.857657

KEYWORDS: Tunable filters, Fabry–Perot interferometers, Spectral resolution, Imaging systems, Telescopes, Imaging spectroscopy, Electron multiplying charge coupled devices, Astronomy, Photon counting, Spatial resolution

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Proceedings Article | 18 September 2009 Paper

Control of deformable mirrors in MOAO using H∞ optimization

Andrés Guesalaga, Dani Guzman, Richard Myers, Tim Morris, Nigel Dipper, Alastair Basden

Proceedings Volume 7439, 74390N (2009) https://doi.org/10.1117/12.826081

KEYWORDS: Actuators, Adaptive optics, Turbulence, Wavefronts, Deformable mirrors, Wavefront sensors, Sensors, Tomography, Device simulation, Telescopes

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Proceedings Article | 16 July 2008 Paper

Deformable mirror controller for open-loop adaptive optics

Dani Guzmán, Andrés Guesalaga, Richard Myers, Ray Sharples, Tim Morris, Alastair Basden, Christopher Saunter, Nigel Dipper, Laura Young, Luis Rodríguez, Marcos Reyes, Yolanda Martin

Proceedings Volume 7015, 70153X (2008) https://doi.org/10.1117/12.787677

KEYWORDS: Sensors, Adaptive optics, Deformable mirrors, Turbulence, Wavefront sensors, Tomography, Actuators, Monte Carlo methods, Optical design, Image resolution

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Proceedings Article | 10 July 2008 Paper

CANARY: the on-sky NGS/LGS MOAO demonstrator for EAGLE

Richard Myers, Zoltán Hubert, Timothy Morris, Eric Gendron, Nigel Dipper, Aglaé Kellerer, Stephen Goodsell, Gérard Rousset, Eddy Younger, Michel Marteaud, Alastair Basden, Fanny Chemla, C. Dani Guzman, Thierry Fusco, Deli Geng, Brice Le Roux, Mark Harrison, Andrew Longmore, Laura Young, Fabrice Vidal, Alan Greenaway

Proceedings Volume 7015, 70150E (2008) https://doi.org/10.1117/12.789544

KEYWORDS: Adaptive optics, Tomography, Control systems, Wavefront sensors, Sensors, Telescopes, Device simulation, Wavefronts, Calibration, Real-time computing

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Proceedings Article | 18 February 2008 Paper

Synthesis of approximate zonal controllers for MEMS DMs

Andres Guesalaga, Dani Guzman, Richard Myers, Ray Sharples, Tim Morris, Christopher Saunter, Alastair Basden

Proceedings Volume 6888, 68880K (2008) https://doi.org/10.1117/12.760838

KEYWORDS: Actuators, Adaptive optics, Sensors, Wavefronts, Turbulence, Microelectromechanical systems, Wavefront sensors, Control systems, Device simulation, Error analysis

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Proceedings Article | 23 June 2006 Paper

Modeling the cost of detector controller support in a multi-instrument observatory

Dani Guzmán

Proceedings Volume 6271, 627110 (2006) https://doi.org/10.1117/12.669175

KEYWORDS: Sensors, Electronics, Observatories, Gemini Observatory, Digital signal processing, Charge-coupled devices, Power supplies, Signal detection, Control systems, Astronomy

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Proceedings Article | 20 June 2006 Paper

Characterization of NIR InGaAs imager arrays for the JDEM SNAP mission concept

S. Seshadri, D. Cole, B. Hancock, P. Ringold, C. Peay, C. Wrigley, M. Bonati, M. Brown, M. Schubnell, G. Rahmer, D. Guzman, D. Figer, G. Tarle, R. Smith, C. Bebek

Proceedings Volume 6276, 62760S (2006) https://doi.org/10.1117/12.673252

KEYWORDS: Sensors, Indium gallium arsenide, Mercury cadmium telluride, Multiplexers, Quantum efficiency, Imaging systems, Data conversion, Near infrared, Sensor performance, Detector development

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Proceedings Article | 29 September 2004 Paper

VIRGO-2K 2.25-um HgCdTe dark current

Roger Smith, Marco Bonati, Dani Guzman

Proceedings Volume 5499, (2004) https://doi.org/10.1117/12.552342

KEYWORDS: Sensors, Temperature metrology, Transistors, Multiplexers, Interference (communication), Servomechanisms, Mercury cadmium telluride, Nondestructive evaluation, Astronomy, Liquids

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Proceedings Article | 29 September 2004 Paper

A versatile wavelength-dependent spectrophotometer for efficiency measurements of CCD and cryogenic gratings

Dani Guzman, Sebastien Blais-Ouellette, Marco Bonati, Amal Elgamil

Proceedings Volume 5499, (2004) https://doi.org/10.1117/12.551973

KEYWORDS: Sensors, Quantum efficiency, Charge-coupled devices, Cryogenics, Monochromators, Light sources, Spectrophotometry, LabVIEW, Optical filtering, Image sensors

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Proceedings Article | 24 September 2004 Paper

Cryogenic VPH gratings for the CELT/TMT

Sebastien Blais-Ouellette, Dani Guzman, Amal Elgamil, Richard Rallison

Proceedings Volume 5494, (2004) https://doi.org/10.1117/12.552185

KEYWORDS: Sensors, Cryogenics, Diffraction gratings, Modulation, Optical components, Diffraction, Prisms, Volume holography, Holography, LabVIEW

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Showing 5 of 37 publications

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