714 citations · 1.5k across the 34 of their papers we have counts for
35 papers
Photonic lantern wavefront reconstruction in a multi-wavefront sensor single-conjugate adaptive optics system
Aditya R. Sengupta, Jordan Diaz, Benjamin L. Gerard +6
Exoplanet direct imaging using adaptive optics (AO) is often limited by non-common path aberrations (NCPAs) and aberrations that are invisible to traditional pupil-plane wavefront…
Characterization of diamond-turned optics for SCALES
Isabel J. Kain, Phil Hinz, Marius Doetz +12
High-contrast imaging has been used to discover and characterize dozens of exoplanets to date. The primary limiting performance factor for these instruments is contrast, the ratio…
Using the Gerchberg-Saxton algorithm to reconstruct non-modulated pyramid wavefront sensor measurements
Vincent Chambouleyron, Aditya Sengupta, Maïssa Salama +9
Adaptive optics (AO) is a technique to improve the resolution of ground-based telescopes by correcting, in real-time, optical aberrations due to atmospheric turbulence and the tele…
First laboratory demonstration of real-time multi-wavefront sensor single conjugate adaptive optics
Benjamin L. Gerard, Daren Dillon, Sylvain Cetre +1
Exoplanet imaging has thus far enabled studies of wide-orbit (10 AU) giant planet (2 Jupiter masses) formation and giant planet atmospheres, with future 30 meter-class Extrem…
High Speed Focal Plane Wavefront Sensing with an Optical Chopper
Benjamin L. Gerard, Daren Dillon, Sylvain Cetre +1
Focal plane wavefront sensing and control is a critical approach to reducing non-common path errors between the a conventional astronomical adaptive optics (AO) wavefront sensor (W…
Laboratory Demonstration of Optimal Identification and Control of Tip-Tilt Systems
Aditya R. Sengupta, Benjamin L. Gerard, Daren Dillon +3
We present the results of testing optimal linear-quadratic-Gaussian (LQG) control for tip and tilt Zernike wavefront modes on the SEAL (Santa cruz Extreme AO Lab) testbed. The cont…
SCALES for Keck: Optical Design
Renate Kupke, R. Deno Stelter, Amirul Hasan +9
SCALES is a high-contrast, infrared coronagraphic imager and integral field spectrograph (IFS) to be deployed behind the W.M. Keck Observatory adaptive optics system. A reflective…
Various Wavefront Sensing and Control Developments on the Santa Cruz Extreme AO Laboratory (SEAL) Testbed
Benjamin L. Gerard, Javier Perez-Soto, Vincent Chambouleyron +7
Ground-based high contrast imaging (HCI) and extreme adaptive optics (AO) technologies have advanced to the point of enabling direct detections of gas-giant exoplanets orbiting bey…
Daytime calibration and testing of the Keck All sky Precision Adaptive Optics Tomography System
Avinash Surendran, Jacques R. Delorme, Carlos M. Correia +12
The development of the Keck All sky Precision Adaptive optics (KAPA) project was initiated in September 2018 to upgrade the Keck I adaptive optics (AO) system to enable laser tomog…
Laboratory Demonstration of Real-Time Focal Plane Wavefront Control of Residual Atmospheric Speckles
Benjamin L. Gerard, Daren Dillon, Sylvain Cetre +1
Current and future high contrast imaging instruments aim to detect exoplanets at closer orbital separations, lower masses, and/or older ages than their predecessors. However, conti…
Performance of Large-Format Deformable Mirrors Constructed with Hybrid Variable Reluctance Actuators II: Initial Lab Results from FLASH
Rachel Bowens-Rubin, Daren Dillon, Philip M. Hinz +1
Advancements in high-efficiency hybrid variable reluctance (HVR) actuators are an enabling technology for building the next generation of large-format deformable mirrors, including…
Developing Adaptive Secondary Mirror Concepts for the APF and W.M. Keck Observatory Based on HVR Technology
Philip M. Hinz, Rachel Bowens-Rubin, Christoph Baranec +16
An Adaptive secondary mirror (ASM) allows for the integration of adaptive optics (AO) into the telescope itself. Adaptive secondary mirrors, based on hybrid variable reluctance (HV…
The Santa Cruz Extreme AO Lab (SEAL): Design and First Light
Rebecca Jensen-Clem, Daren Dillon, Benjamin Gerard +9
The Santa Cruz Extreme AO Lab (SEAL) is a new visible-wavelength testbed designed to advance the state of the art in wavefront control for high contrast imaging on large, segmented…
First Experimental Results of the Fast Atmospheric Self-coherent Camera Technique on the Santa cruz Extreme Adaptive optics Laboratory Testbed: Demonstration of High Speed Focal Plane Wavefront Control of Residual Atmospheric Speckles
Benjamin L. Gerard, Daren Dillon, Sylvain Cetre +3
Current and future high contrast imaging instruments aim to detect exoplanets at closer orbital separations, lower masses, and/or older ages than their predecessors, with the event…
FOBOS: A Next-Generation Spectroscopic Facility at the W. M. Keck Observatory
K. Bundy, K. Westfall, N. MacDonald +38
High-multiplex and deep spectroscopic follow-up of upcoming panoramic deep-imaging surveys like LSST, Euclid, and WFIRST is a widely recognized and increasingly urgent necessity. N…
1 to 2.4 micron Near-IR spectrum of the Giant Planet Pictoris b obtained with the Gemini Planet Imager
Jeffrey Chilcote, Laurent Pueyo, Robert J. De Rosa +61
Using the Gemini Planet Imager (GPI) located at Gemini South, we measured the near-infrared (1.0-2.4 micron) spectrum of the planetary companion to the nearby, young star Picto…
Gemini Planet Imager Spectroscopy of the HR 8799 planets c and d
Patrick Ingraham, Mark S. Marley, Didier Saumon +43
During the first-light run of the Gemini Planet Imager (GPI) we obtained K-band spectra of exoplanets HR 8799 c and d. Analysis of the spectra indicates that planet d may be warmer…
Opto-Mechanical Design of ShaneAO: the Adaptive Optics System for the 3-meter Shane Telescope
Christopher Ratliff, Jerry Cabak, Donald Gavel +8
A Cassegrain mounted adaptive optics instrument presents unique challenges for opto-mechanical design. The flexure and temperature tolerances for stability are tighter than those o…
ShaneAO: wide science spectrum adaptive optics system for the Lick Observatory
Donald Gavel, Renate Kupke, Daren Dillon +14
A new high-order adaptive optics system is now being commissioned at the Lick Observatory Shane 3-meter telescope in California. This system uses a high return efficiency sodium be…
Swimming with ShARCS: Comparison of On-sky Sensitivity With Model Predictions for ShaneAO on the Lick Observatory 3-meter Telescope
Srikar Srinath, Rosalie McGurk, Constance Rockosi +10
The Lick Observatory's Shane 3-meter telescope has been upgraded with a new infrared instrument (ShARCS - Shane Adaptive optics infraRed Camera and Spectrograph) and dual-deformabl…
Commissioning ShARCS: the Shane Adaptive optics infraRed Camera-Spectrograph for the Lick Observatory 3-m telescope
Rosalie McGurk, Constance Rockosi, Donald Gavel +16
We describe the design and first-light early science performance of the Shane Adaptive optics infraRed Camera-Spectrograph (ShARCS) on Lick Observatory's 3-m Shane telescope. Desig…
On-sky low order non-common path correction of the GPI Calibration Unit
Markus Hartung, Bruce Macintosh, Paul Langlois +12
The Gemini Planet Imager (GPI) entered on-sky commissioning phase, and had its First Light at the Gemini South telescope in November 2013. Meanwhile, the fast loops for atmospheric…
On-sky vibration environment for the Gemini Planet Imager and mitigation effort
Markus Hartung, Tom Hayward, Les Saddlemyer +20
The Gemini Planet Imager (GPI) entered on-sky commissioning and had its first-light at the Gemini South (GS) telescope in November 2013. GPI is an extreme adaptive optics (XAO), hi…
The First H-band Spectrum of the Massive Gas Giant Planet beta Pictoris b with the Gemini Planet Imager
Jeffrey Chilcote, Travis Barman, Michael P. Fitzgerald +43
Using the recently installed Gemini Planet Imager (GPI), we have taken the first H-band spectrum of the planetary companion to the nearby young star beta Pictoris. GPI is designed…