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Advanced Adaptive Optics Technology Development

Description: The NSF Center for Adaptive Optics (CfAO) is supporting research on advanced adaptive optics technologies. CfAO research activities include development and characterization of micro-electro-mechanical systems (MEMS) deformable mirror (DM) technology, as well as development and characterization of high-resolution adaptive optics systems using liquid crystal (LC) spatial light modulator (SLM) technology. This paper presents an overview of the CfAO advanced adaptive optics technology development a… more
Date: September 18, 2001
Creator: Olivier, S.
Partner: UNT Libraries Government Documents Department
open access

AO Group Annual Report

Description: The Adaptive Optics (AO) Group in I Division develops and tests a broad range of advanced wavefront control technologies. Current applications focus on: Remote sensing, High power lasers, Astronomy, and Human vision. In the area of remote sensing, the AO Group leads a collaborative effort with LLNL's Nonproliferation, Arms Control & International Security (NAI) Directorate on Enhanced Surveillance Imaging. The ability to detect and identify individual people or vehicles from long-range is an im… more
Date: October 4, 2005
Creator: Olivier, S.
Partner: UNT Libraries Government Documents Department
open access

Adaptive Optics Applications in Vision Science

Description: Adaptive optics can be used to correct the aberrations in the human eye caused by imperfections in the cornea and the lens and thereby, improve image quality both looking into and out of the eye. Under the auspices of the NSF Center for Adaptive Optics and the DOE Biomedical Engineering Program, Lawrence Livermore National Laboratory has joined together with leading vision science researchers around the country to develop and test new ophthalmic imaging systems using novel wavefront corrector t… more
Date: March 17, 2003
Creator: Olivier, S. S.
Partner: UNT Libraries Government Documents Department
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Simulation and analysis of laser guide star adaptive optics systems for the eight to ten meter class telescopes

Description: This paper discusses the design and analysis of laser-guided adaptive optic systems for the large, 8--10 meter class telescopes. We describe a technique for calculating the expected modulation transfer function and the point spread function for a closed loop adaptive optics system, parameterized by the degree of correction and the seeing conditions. The results agree closely with simulations and experimental data, and validate well known scaling law models even at low order correction. Scaling … more
Date: March 1, 1994
Creator: Gavel, D. T. & Olivier, S. S.
Partner: UNT Libraries Government Documents Department
open access

Laser guide star adaptive optics: Present and future

Description: Feasibility demonstrations using one to two meter telescopes have confirmed the utility of laser beacons as wavefront references for adaptive optics systems. Laser beacon architectures suitable for the new generation of eight and ten meter telescopes are presently under study. This paper reviews the concept of laser guide star adaptive optics and the progress that has been made by groups around the world implementing such systems. A description of the laser guide star program at LLNL and some e… more
Date: March 1, 1993
Creator: Olivier, S. S. & Max, C. E.
Partner: UNT Libraries Government Documents Department
open access

Performance predictions for the Keck telescope adaptive optics system

Description: The second Keck ten meter telescope (Keck-11) is slated to have an infrared-optimized adaptive optics system in the 1997--1998 time frame. This system will provide diffraction-limited images in the 1--3 micron region and the ability to use a diffraction-limited spectroscopy slit. The AO system is currently in the preliminary design phase and considerable analysis has been performed in order to predict its performance under various seeing conditions. In particular we have investigated the point-… more
Date: August 7, 1995
Creator: Gavel, D. T. & Olivier, S. S.
Partner: UNT Libraries Government Documents Department
open access

Performance of adaptive optics at Lick Observatory

Description: A prototype adaptive optics system has been developed at Lawrence Livermore National Laboratory (LLNL) for use at Lick Observatory. This system is based on an ITEX 69-actuator continuous-surface deformable mirror, a Kodak fast-framing intensified CCD camera, and a Mercury VME board containing four Intel i860 processors. The system has been tested using natural reference stars on the 40-inch Nickel telescope at Lick Observatory yielding up to a factor of 10 increase in image peak intensity and a… more
Date: March 1, 1994
Creator: Olivier, S. S.; An, J. & Avicola, K.
Partner: UNT Libraries Government Documents Department
open access

Performance of laser guide star adaptive optics at Lick Observatory

Description: A sodium-layer laser guide star adaptive optics system has been developed at Lawrence Livermore National Laboratory (LLNL) for use on the 3-meter Shane telescope at Lick Observatory. The system is based on a 127-actuator continuous-surface deformable mirror, a Hartmann wavefront sensor equipped with a fast-framing low-noise CCD camera, and a pulsed solid-state-pumped dye laser tuned to the atomic sodium resonance line at 589 nm. The adaptive optics system has been tested on the Shane telescope … more
Date: July 19, 1995
Creator: Olivier, S. S.; An, J. & Avicola, K.
Partner: UNT Libraries Government Documents Department
open access

Conceptual design for a user-friendly adaptive optics system at Lick Observatory

Description: In this paper, we present a conceptual design for a general-purpose adaptive optics system, usable with all Cassegrain facility instruments on the 3 meter Shane telescope at the University of California`s Lick Observatory located on Mt. Hamilton near San Jose, California. The overall design goal for this system is to take the sodium-layer laser guide star adaptive optics technology out of the demonstration stage and to build a user-friendly astronomical tool. The emphasis will be on ease of cal… more
Date: March 8, 1996
Creator: Bissinger, H.D.; Olivier, S. & Max, C.
Partner: UNT Libraries Government Documents Department
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Performance of keck adaptive optics with sodium laser guide star

Description: The Keck telescope adaptive optics system is designed to optimize performance in he 1 to 3 micron region of observation wavelengths (J, H, and K astronomical bands). The system uses a 249 degree of freedom deformable mirror, so that the interactuator spacing is 56 cm as mapped onto the 10 meter aperture. 56 cm is roughly equal to r0 at 1.4 microns, which implies the wavefront fitting error is 0.52 ({lambda}/2{pi})({ital d}/{ital r}{sub 0}){sup 5/6} = 118 nm rms. This is sufficient to produce a … more
Date: March 8, 1996
Creator: Gavel, D. T.; Olivier, S. & Brase, J.
Partner: UNT Libraries Government Documents Department
open access

Initial results from the Lick Observatory Laser Guide Star Adaptive Optics System

Description: A prototype adaptive optics system has been installed and tested on the 3 m Shane telescope at Lick Observatory. The adaptive optics system performance, using bright natural guide stars, is consistent with expectations based on theory. A sodium-layer laser guide star system has also been installed and tested on the Shane telescope. Operating at 15 W, the laser system produces a 9th magnitude guide star with seeing-limited size at 589 nm. Using the laser guide star, the adaptive optics system ha… more
Date: November 8, 1995
Creator: Olivier, S. S.; An, J. & Avicola, K.
Partner: UNT Libraries Government Documents Department
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Correction of Distributed Optical Aberrations

Description: The objective of this project was to demonstrate the use of multiple distributed deformable mirrors (DMs) to improve the performance of optical systems with distributed aberrations. This concept is expected to provide dramatic improvement in the optical performance of systems in applications where the aberrations are distributed along the optical path or within the instrument itself. Our approach used multiple actuated DMs distributed to match the aberration distribution. The project developed … more
Date: February 12, 2006
Creator: Baker, K.; Olivier, S.; Carrano, C. & Phillion, D.
Partner: UNT Libraries Government Documents Department
open access

Large-Stroke Self-Aligned Vertical Comb Drive Actuators for Adaptive Optics Applications

Description: A high-stroke micro-actuator array was designed, modeled, fabricated and tested. Each pixel in the 4x4 array consists of a self-aligned vertical comb drive actuator. This micro-actuator array was designed to become the foundation of a micro-mirror array that will be used as a deformable mirror for adaptive optics applications. Analytical models combined with CoventorWare{reg_sign} simulations were used to design actuators that would move up to 10{micro}m in piston motion with 100V applied. Devi… more
Date: October 27, 2005
Creator: Carr, E. J.; Olivier, S. S. & Solgaard, O.
Partner: UNT Libraries Government Documents Department
open access

Issues in the design and optimization of adaptive optics and laser guide stars for the Keck Telescopes

Description: We discuss issues in optimizing the design of adaptive optics and laser guide star systems for the Keck Telescope. The initial tip-tilt system will use Keck`s chopping secondary mirror. We describe design constraints, choice of detector, and expected performance of this tip-tilt system as well as its sky coverage. The adaptive optics system is being optimized for wavelengths of I-2.2{mu}m. We are studying adaptive optics concepts which use a wavefront sensor with varying numbers of subapertures… more
Date: March 1, 1994
Creator: Max, C. E.; Gavel, D. T. & Olivier, S. S.
Partner: UNT Libraries Government Documents Department
open access

Fast Fourier and Wavelet Transforms for Wavefront Reconstruction in Adaptive Optics

Description: Wavefront reconstruction techniques using the least-squares estimators are computationally quite expensive. We compare wavelet and Fourier transforms techniques in addressing the computation issues of wavefront reconstruction in adaptive optics. It is shown that because the Fourier approach is not simply a numerical approximation technique unlike the wavelet method, the Fourier approach might have advantages in terms of numerical accuracy. However, strictly from a numerical computations viewpoi… more
Date: July 28, 2000
Creator: Dowla, F. U.; Brase, J. M. & Olivier, S. S.
Partner: UNT Libraries Government Documents Department
open access

Intelligent Sensor Tasking for Space Collision Mitigation

Description: Orbital collisions pose a hazard to space operations. Using a high performance computer modeling and simulation environment for space situational awareness, we explore a new paradigm for improving satellite conjunction analysis by obtaining more precise orbital information only for those objects that pose a collision risk greater than a defined threshold to a specific set of satellites during a specified time interval. In particular, we assess the improvement in the quality of the conjunction a… more
Date: April 1, 2010
Creator: Olivier, S. S.; Pertica, A. J. & Henderson, J. R.
Partner: UNT Libraries Government Documents Department
open access

MEMS Actuated Deformable Mirror

Description: This ongoing work concerns the creation of a deformable mirror by the integration of MEMS actuators with Nanolaminate foils through metal compression boning. These mirrors will use the advantages of these disparate technologies to achieve dense actuation of a high-quality, continuous mirror surface. They will enable advanced adaptive optics systems in large terrestrial telescopes. While MEMS actuators provide very dense actuation with high precision they can not provide large forces typically n… more
Date: November 10, 2005
Creator: Papavasiliou, A.; Olivier, S.; Barbee, T.; Walton, C. & Cohn, M.
Partner: UNT Libraries Government Documents Department
open access

Large Scale Nanolaminate Deformable Mirror

Description: This work concerns the development of a technology that uses Nanolaminate foils to form light-weight, deformable mirrors that are scalable over a wide range of mirror sizes. While MEMS-based deformable mirrors and spatial light modulators have considerably reduced the cost and increased the capabilities of adaptive optic systems, there has not been a way to utilize the advantages of lithography and batch-fabrication to produce large-scale deformable mirrors. This technology is made scalable by … more
Date: November 30, 2005
Creator: Papavasiliou, A.; Olivier, S.; Barbee, T.; Miles, R. & Chang, K.
Partner: UNT Libraries Government Documents Department
open access

High-resolution adaptive optics scanning laser ophthalmoscope with dual deformable mirrors for large aberration correction

Description: Scanning laser ophthalmoscopes with adaptive optics (AOSLO) have been shown previously to provide a noninvasive, cellular-scale view of the living human retina. However, the clinical utility of these systems has been limited by the available deformable mirror technology. In this paper, we demonstrate that the use of dual deformable mirrors can effectively compensate large aberrations in the human retina, making the AOSLO system a viable, non-invasive, high-resolution imaging tool for clinical d… more
Date: January 25, 2007
Creator: Chen, D.; Jones, S. M.; Silva, D. A. & Olivier, S. S.
Partner: UNT Libraries Government Documents Department
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LSST Camera Optics

Description: The Large Synoptic Survey Telescope (LSST) is a unique, three-mirror, modified Paul-Baker design with an 8.4m primary, a 3.4m secondary, and a 5.0m tertiary feeding a camera system that includes corrector optics to produce a 3.5 degree field of view with excellent image quality (<0.3 arcsecond 80% encircled diffracted energy) over the entire field from blue to near infra-red wavelengths. We describe the design of the LSST camera optics, consisting of three refractive lenses with diameters of… more
Date: June 5, 2006
Creator: Olivier, S. S.; Seppala, L.; Gilmore, K.; Hale, L. & Whistler, W.
Partner: UNT Libraries Government Documents Department
open access

Tomographic wavefront correction for the LSST

Description: The Large Synoptic Survey Telescope (LSST) is a three mirror modified Paul-Baker design with an 8.4m primary, a 3.4m secondary, and a 5.0m tertiary followed by a 3-element refractive corrector producing a 3.5 degree field of view. This design produces image diameters of <0.3 arcsecond 80% encircled energy over its full field of view. The image quality of this design is sufficient to ensure that the final images produced by the telescope will be limited by the atmospheric seeing at an excelle… more
Date: May 3, 2006
Creator: Phillion, D. W.; Olivier, S. S.; Baker, K.; Seppala, L. & Hvisc, S.
Partner: UNT Libraries Government Documents Department
open access

Tip-tilt compensation: Resolution limits for ground-based telescopes using laser guide star adaptive optics. Revision 2

Description: The angular resolution of long-exposure images from ground-based telescopes equipped with laser guide star adaptive optics systems is fundamentally limited by the the accuracy with which the tip-tilt aberrations introduced by the atmosphere can be corrected. Assuming that a natural star is used as the tilt reference, the residual error due to tilt anisoplanatism can significantly degrade the long-exposure resolution even if the tilt reference star is separated from the object being imaged by a … more
Date: October 8, 1992
Creator: Olivier, S. S.; Max, C. E.; Gavel, D. T. & Brase, J. M.
Partner: UNT Libraries Government Documents Department
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