Kris Caputa
National Research Council
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Kris Caputa.
Proceedings of SPIE | 2012
Bruce A. Macintosh; Andre Anthony; Jennifer Atwood; Nicolas A. Barriga; Brian J. Bauman; Kris Caputa; Jeffery Chilcote; Daren Dillon; René Doyon; Jennifer Dunn; Donald Gavel; Ramon Galvez; Stephen J. Goodsell; James R. Graham; Markus Hartung; Joshua Isaacs; Dan Kerley; Quinn Konopacky; Kathleen Labrie; James E. Larkin; Jérôme Maire; Christian Marois; Max Millar-Blanchaer; Arturo Nunez; Ben R. Oppenheimer; David Palmer; John Pazder; Marshall D. Perrin; Lisa A. Poyneer; Carlos Quirez
The Gemini Planet Imager is a next-generation instrument for the direct detection and characterization of young warm exoplanets, designed to be an order of magnitude more sensitive than existing facilities. It combines a 1700-actuator adaptive optics system, an apodized-pupil Lyot coronagraph, a precision interferometric infrared wavefront sensor, and a integral field spectrograph. All hardware and software subsystems are now complete and undergoing integration and test at UC Santa Cruz. We will present test results on each subsystem and the results of end-to-end testing. In laboratory testing, GPI has achieved a raw contrast (without post-processing) of 10-6 5σ at 0.4”, and with multiwavelength speckle suppression, 2x10-7 at the same separation.
Proceedings of SPIE | 2014
Glen Herriot; David Andersen; Jenny Atwood; Corinne Boyer; Peter W. G. Byrnes; Kris Caputa; Brent Ellerbroek; Luc Gilles; Alexis Hill; Zoran Ljusic; John Pazder; Matthias Rosensteiner; Malcolm Smith; Paolo Spano; Kei Szeto; Jean-Pierre Véran; Ivan Wevers; L. Wang; Robert Wooff
NFIRAOS, the Thirty Meter Telescope’s first adaptive optics system is an order 60x60 Multi-Conjugate AO system with two deformable mirrors. Although most observing will use 6 laser guide stars, it also has an NGS-only mode. Uniquely, NFIRAOS is cooled to -30 °C to reduce thermal background. NFIRAOS delivers a 2-arcminute beam to three client instruments, and relies on up to three IR WFSs in each instrument. We present recent work including: robust automated acquisition on these IR WFSs; trade-off studies for a common-size of deformable mirror; real-time computing architectures; simplified designs for high-order NGS-mode wavefront sensing; modest upgrade concepts for high-contrast imaging.
Proceedings of SPIE | 2010
Brent Ellerbroek; Sean M. Adkins; David R. Andersen; Jennifer Atwood; Steve Browne; Corinne Boyer; Peter Byrnes; Kris Caputa; Rodolphe Conan; Raphaël Cousty; Daren Erikson; Joeleff Fitzsimmons; Frederick Gamache; Luc Gilles; Glen Herriot; Paul Hickson; Olivier Lardier; Pierre Morin; John Pazder; Thomas Pfrommer; David Quinn; Vladimir Reshetov; Scott Roberts; Jean-Christophe Sinquin; Matthias Schoeck; Malcolm Smith; Glenn A. Tyler; Jeff Vaughn; Jean-Pierre Véran; Curt Vogel
Adaptive optics (AO) is essential for many elements of the science case for the Thirty Meter Telescope (TMT). The initial requirements for the observatorys facility AO system include diffraction-limited performance in the near IR, with 50 per cent sky coverage at the galactic pole. Point spread function uniformity and stability over a 30 arc sec field-ofview are also required for precision photometry and astrometry. These capabilities will be achieved via an order 60×60 multi-conjugate AO system (NFIRAOS) with two deformable mirrors, six laser guide star wavefront sensors, and three low-order, IR, natural guide star wavefront sensors within each client instrument. The associated laser guide star facility (LGSF) will employ 150W of laser power at a wavelength of 589 nm to generate the six laser guide stars. We provide an update on the progress in designing, modeling, and validating these systems and their components over the last two years. This includes work on the layouts and detailed designs of NFIRAOS and the LGSF; fabrication and test of a full-scale prototype tip/tilt stage (TTS); Conceptual Designs Studies for the real time controller (RTC) hardware and algorithms; fabrication and test of the detectors for the laser- and natural-guide star wavefront sensors; AO system modeling and performance optimization; lab tests of wavefront sensing algorithms for use with elongated laser guide stars; and high resolution LIDAR measurements of the mesospheric sodium layer. Further details may be found in specific papers on each of these topics.
Proceedings of SPIE | 2014
Bruce A. Macintosh; Andre Anthony; Jenny Atwood; Brian J. Bauman; Andrew Cardwell; Kris Caputa; Jeffery Chilcote; Robert J. De Rosa; Daren Dillon; René Doyon; Jennifer Dunn; Darren Erickson; Michael P. Fitzgerald; Donald Gavel; Ramon Galvez; Stephen J. Goodsell; James R. Graham; Alexandra Z. Greenbaum; Markus Hartung; Pascale Hibon; Patrick Ingraham; Dan Kerley; Quinn Konopacky; Kathleen Labrie; James E. Larkin; Jérôme Maire; Franck Marchis; Christian Marois; Max Millar-Blanchaer; Katie M. Morzinski
The Gemini Planet Imager (GPI) is a facility extreme-AO high-contrast instrument – optimized solely for study of faint companions – on the Gemini telescope. It combines a high-order MEMS AO system (1493 active actuators), an apodized pupil Lyot coronagraph, a high-accuracy IR post-coronagraph wavefront sensor, and a near-infrared integral field spectrograph. GPI incorporates several other novel features such as ultra-high quality optics, a spatially-filtered wavefront sensor, and new calibration techniques. GPI had first light in November 2013. This paper presnets results of first-light and performance verification and optimization and shows early science results including extrasolar planet spectra and polarimetric detection of the HR4696A disk. GPI is now achieving contrasts approaching 10-6 at 0.5” in 30 minute exposures.
Proceedings of SPIE | 2008
Stephane Claude; F. Jiang; P. Niranjanan; P. Dindo; Darren Erickson; Keith Yeung; D. Derdall; Dave Duncan; Dominic Garcia; Brian Leckie; M. Pfleger; G. Rodrigues; Kei Szeto; Paul Welle; I. Wood; Kris Caputa; Art Lichtenberger; S-K. Pan
The Band 3 receiver, covering the 84-116 GHz frequency band is one of the 10 channels that will be installed on the Atacama Large Millimeter Array (ALMA). A total of 73 units have to be built in two phases: 8 preproduction and then 65 production units. This paper reports on the assembly, testing and performance of the preproduction series of these state-of-the-art millimeter receivers.
international conference on infrared, millimeter, and terahertz waves | 2005
Stephane Claude; P. Dindo; D. Erickson; F. Jiang; K. Yeung; D. Derdall; D. Duncan; D. Garcia; D. Henke; B. Leckie; A. Lichtenberger; P. Niranjanan; S.-K. Pan; M. Pfleger; G. Rodrigues; K. Szeto; P. Welle; Kris Caputa
Test results are presented of the Band 3 module integrated into the Atacama large millimeter array (ALMA) front end receiver. The 84 to 116 GHz collected signal by the Band 3 receiver is split into two orthogonal polarisations using an orthomode transducer and then down-converted to 6 GHz over 4 GHz bandwidth using sideband separating mixers with better than 10 dB of image rejection. The single sideband systems low noise of 35 to 45 K is achieved by cascading superconductor-insulator-superconductor (SIS) mixers and low noise cryogenic amplifiers that consist of three stage high mobility transistors (HEMT) operating at 4 K.
Proceedings of SPIE | 2014
Corinne Boyer; Sean M. Adkins; David Andersen; Jenny Atwood; Yong Bo; Peter W. G. Byrnes; Kris Caputa; Jeff Cavaco; Brent Ellerbroek; Luc Gilles; James A. Gregory; Glen Herriot; Paul Hickson; Zoran Ljusic; Darren Manter; Christian Marois; Angel Otarola; Hubert Pagès; Matthias Schoeck; Jean-Christophe Sinquin; Malcolm Smith; Paolo Spano; Kei Szeto; Jinlong Tang; Tony Travouillon; Jean-Pierre Véran; L. Wang; Kai Wei
The TMT first light Adaptive Optics (AO) facility consists of the Narrow Field Infra-Red AO System (NFIRAOS) and the associated Laser Guide Star Facility (LGSF). NFIRAOS is a 60 × 60 laser guide star (LGS) multi-conjugate AO (MCAO) system, which provides uniform, diffraction-limited performance in the J, H, and K bands over 17-30 arc sec diameter fields with 50 per cent sky coverage at the galactic pole, as required to support the TMT science cases. NFIRAOS includes two deformable mirrors, six laser guide star wavefront sensors, and three low-order, infrared, natural guide star wavefront sensors within each client instrument. The first light LGSF system includes six sodium lasers required to generate the NFIRAOS laser guide stars. In this paper, we will provide an update on the progress in designing, modeling and validating the TMT first light AO systems and their components over the last two years. This will include pre-final design and prototyping activities for NFIRAOS, preliminary design and prototyping activities for the LGSF, design and prototyping for the deformable mirrors, fabrication and tests for the visible detectors, benchmarking and comparison of different algorithms and processing architecture for the Real Time Controller (RTC) and development and tests of prototype candidate lasers. Comprehensive and detailed AO modeling is continuing to support the design and development of the first light AO facility. Main modeling topics studied during the last two years include further studies in the area of wavefront error budget, sky coverage, high precision astrometry for the galactic center and other observations, high contrast imaging with NFIRAOS and its first light instruments, Point Spread Function (PSF) reconstruction for LGS MCAO, LGS photon return and sophisticated low order mode temporal filtering.
Proceedings of SPIE | 2009
Rémi Soummer; Anand Sivaramakrishnan; Ben R. Oppenheimer; Robin Roberts; Douglas Brenner; Alexis Carlotti; Laurent Pueyo; Bruce A. Macintosh; Brian J. Bauman; Les Saddlemyer; David Palmer; Darren Erickson; Christophe Dorrer; Kris Caputa; Christian Marois; Kent Wallace; Emily Griffiths; Jacob Mey
The Gemini Planet Imager (GPI) is a new facility instrument to be commissioned at the 8-m Gemini South telescope in early 2011. It combines of several subsystems including a 1500 subaperture Extreme Adaptive Optics system, an Apodized Pupil Lyot Coronagraph, a near-infrared high-accuracy interferometric wavefront sensor, and an Integral Field Unit Spectrograph, which serves as the science instrument. GPIs main scientific goal is to detect and characterize relatively young (<2GYr), self luminous planets with planet-star brightness ratios of ≤ 10-7 in the near infrared. Here we present an overview of the coronagraph subsystem, which includes a pupil apodization, a hard-edged focal plane mask and a Lyot stop. We discuss designs optimization, masks fabrication and testing. We describe a near infrared testbed, which achieved broadband contrast (H-band) below 10-6 at separations > 5λ/D, without active wavefront control (no deformable mirror). We use Fresnel propagation modeling to analyze the testbed results.
Proceedings of SPIE | 2012
Brent Ellerbroek; Sean M. Adkins; David Andersen; Jenny Atwood; Arnaud Bastard; Yong Bo; Marc-Andre Boucher; Corinne Boyer; Peter W. G. Byrnes; Kris Caputa; Shanqiu Chen; Carlos Correia; Raphaël Cousty; Joeleff Fitzsimmons; Luc Gilles; James A. Gregory; Glen Herriot; Paul Hickson; Alexis Hill; John Pazder; Hubert Pagès; Thomas Pfrommer; Vladimir A. Reshetov; Scott Roberts; Jean-Christophe Sinquin; Matthias Schoeck; Malcolm Smith; Jean-Pierre Véran; L. Wang; Kai Wei
We provide an update on the development of the first light adaptive optics systems for the Thirty Meter Telescope (TMT) over the past two years. The first light AO facility for TMT consists of the Narrow Field Infra-Red AO System (NFIRAOS) and the associated Laser Guide Star Facility (LGSF). This order 60 × 60 laser guide star (LGS) multi-conjugate AO (MCAO) architecture will provide uniform, diffraction-limited performance in the J, H, and K bands over 17-30 arc sec diameter fields with 50 per cent sky coverage at the galactic pole, as is required to support TMT science cases. Both NFIRAOS and the LGSF have successfully completed design reviews during the last twelve months. We also report on recent progress in AO component prototyping, control algorithm development, and system performance analysis.
Proceedings of SPIE | 2014
Kris Caputa; Jenny Atwood; Glen Herriot; Jean-Pierre Véran; Paolo Spano; Adam Zielinski
High order AO subsystems of the ELT require technological advancements in the Deformable Mirror (DM) construction and corresponding improvements in the drive electronics. Advanced prototyping is currently under way at NSI-Herzberg to reduce risks of deploying untried technology in the TMT AO subsystem NFIRAOS. We have developed a 96-channel output module and constructed a sub-scale DM Electronics prototype NDME384 with 384 output channels based on 4 such modules. French DM vendor Cilas has fabricated the NFIRAOS DM Breadoboard with 360 piezoelectric actuators in a 60×6 matrix, to demonstrate the DM technology to be deployed in NFIRAOS wavefront correctors. We present the results of testing our NDME384 prototype while driving the NFIRAOS DM Breadoboard.