Performance modeling of a wide-field ground-layer adaptive optics system. (2006)
Andersen, D., Stoesz, J., Morris, S., Lloyd-Hart, M., Crampton, D., Butterley, T., ...
Using five independent analytic and Monte Carlo simulation codes, we have studied the performance of wide-field ground-layer adaptive optics (GLAO), which can use a single, relatively low order...
Performance Modeling of a Wide Field Ground Layer Adaptive Optics System (2006)
Andersen, D., Stoesz, J., Morris, S., Lloyd-Hart, M., Crampton, D., Butterley, T., ...
Using five independent analytic and Monte Carlo simulation codes, we have studied the performance of wide field ground layer adaptive optics (GLAO), which can use a single, relatively low order...
First tests of wavefront sensing with a constellation of laser guide beacons (2005)
Lloyd-Hart, M., Baranec, C., Milton, N. M., Stalcup, T., Snyder, M., Putnam, N., ...
Adaptive optics to correct current telescopes over wide fields, or future very large telescopes over even narrow fields, will require real-time wavefront measurements made with a constellation of...
Biller, B. A., Close, L. M., Li, A., Bieging, J. H., Hoffmann, W. F., Hinz, P. M., ...
We present high resolution (~0.1"), very high Strehl ratio (0.97+-0.03) mid-infrared (IR) adaptive optics (AO) images of the AGB star RV Boo utilizing the MMT adaptive secondary AO system. RV Boo was...
Liu, W. M., Hinz, P. M., Hoffmann, W. F., Brusa, G., Wildi, F., Miller, D., ...
We present the results of mid-infrared nulling interferometric observations of the main-sequence star alpha Lyr (Vega) using the 6.5 m MMT with its adaptive secondary mirror. From the observations at...
Close, L. M., Potter, D., Brandner, W., Lloyd-Hart, M., Liebert, J., Burrows, A., ...
Use of the highly sensitive Hokupa'a curvature wavefront sensor has allowed for the first time direct adaptive optics (AO) guiding on brown dwarfs and VLM stars (SpT=M7-L2). An initial survey of 9...
P Prototype, A. Riccardi, G. Brusa, V. Biliotti, C. Del Vecchio, P. Salinari, ...
The 336-actuator adaptive secondary unit (MMT336) for the new MMT is being assembled in Italy and will be delivered in June 2000 for the acceptance test at Steward Observatory (Tucson, AZ). The...
New Approach to Rayleigh Guide Beacons (2000)
M. Lloyd-hart, S. M. Jefferies, E. K. Hege, J. R. P. Angel
We present analysis and numerical simulations of a new method to sense atmospheric wavefront distortion in real time with Rayleigh beacons. Multiple range-gated images of a single pulse from the...
M. Lloyd-hart, R. Angel, B. Jacobsen, D. Wittman, E. Kibblewhite, B. Carter, ...
A 0.5 W beam from a continuous-wave dye laser, tuned to the D 2 resonance of atomic sodium, has been used to generate an artificial guide star by illuminating the mesospheric sodium layer, 90 km...
Final review of adaptive optics results from the pre-conversion MMT (2000)
M. Lloyd-hart, R. Angel, T. Groesbeck, P. Mcguire, D. Mccarthy, T. Martinez, ...
The FASTTRAC II adaptive optics instrument has been used at the Multiple Mirror Telescope (MMT) for the past 2 years to provide improved image resolution in the near infrared. Results have been...
T. A. Rhoadarmer, P. C. Mcguire, M. Lloyd-hart, J. R. P. Angel, B. Cuerden, B. Fitzpatrick
A description is given for the geometry of the #rst generation adaptive-optical #AO# system being developed for the 6.5 m single-mirror telescope that will replace the Multiple Mirror Telescope on...
High Order Adaptive Optics System With a High Density Spherical Membrane Deformable Mirror (2000)
M. P. Langlois, J. P. R. Angel, M. Lloyd-hart, S. Miller, G. Angeli
Wehave designed a new type of curved deformable mirror with 3000 actuators. It will be used at the 6.5 m MMT telescope in an adaptive optics system to correct the wavefront on a scale of 12 cm, for...
M. Lloyd-hart, J. R. P. Angel, T. D. Groesbeck, T. Martinez, B. P. Jacobsen, B. A. Mcleod, ...
Adaptive optics with a sodium resonance laser guide star was used at the Multiple Mirror Telescope (MMT) in 1996 April to image the core of the globular cluster M13 (NGC 6205). A 23 field was...
Diffraction-limited K-band imaging at the Multiple Mirror Telescope with adaptive optics (2000)
M. Lloyd-hart, D. Colucci, D. Wittman, B. Mcleod, A. Ghez, D. Mccarthy, ...
Low spatial frequencies of atmospheric turbulence are specially troublesome to astronomers because the phase distortions they cause have large amplitude. We have begun experiments at the Multiple...
Direct 75 Milliarcsecond Images from the Multiple Mirror Telescope with Adaptive Optics (2000)
M. Lloyd-hart, R. Dekany, B. Mcleod, D. Wittman, D. Colucci, D. Mccarthy, ...
We report results from an adaptive optics system designed to provide imaging at the diffraction limit of resolution in the near infrared at the Multiple Mirror Telescope (MMT). For the present...
M. Lloyd-hart, B. Jacobsen, R. Angel, R. Dekany, B. Carter, W. Wild, ...
We have obtained the first measurements with a sodium laser beacon of focus anisoplanatism over large aperture, at the Multiple Mirror Telescope (MMT). Focus anisoplanatism sets the fundamental limit...
Infrared adaptive optics system for the 6.5 m MMT: system status (2000)
M. Lloyd-hart, G. Angeli, R. Angel, P. Mcguire, T. Rhoadarmer, S. Miller
We report on the current state of the adaptive optics system being built for near infrared operation at the 6.5 m MMT. The system will use a single sodium laser beacon and a deformable secondary...
Astronomical Results using Physically-Constrained Iterative Deconvolution (2000)
E. K. Hege, M. Cheselka, M. Lloyd-hart, P. Hinz, W. F. Homann, J. C. Christou, ...
Iterative physical deconvolution is used for point spread function (psf)...
Laser-based adaptive optics system for the 6.5 m MMT (2000)
M. Lloyd-hart, J. R. P. Angel
The Multiple Mirror Telescope (MMT) will be converted to a single-mirror telescope in early 1998. Adaptive optics using a sodium laser guide star will be an integral part of the new telescope with...
Miniature Instrument for the Measurement of Gap Thickness Using Poly-Chromatic Interferometry (2000)
R. L. Johnson, J. R. P. Angel, M. Lloyd-hart, G. Z. Angeli
An optical instrument for measuring the thickness of a thin gap or transparent #lm is presented. It will be used to calibrate the adaptive secondary mirror under development for the Steward...
M. Lloyd-hart, R. Angel, B. Jacobsen, D. Wittman, D. Mccarthy, E. Kibblewhite, ...
A sodium guide star has been used to sense and correct atmospheric aberration during two runs at the Multiple Mirror Telescope (MMT). For the first run in 1993 May, the artificial star was created by...
Adaptive Optics High Resolution Spectroscopy: Present Status and Future Direction (2000)
Jian Ge, D. Ciarlo, P. Kuzmenko, C. Alcock, B. Macintosh, R. Angel, ...
High resolution spectroscopy experiments with visible adaptive optics (AO) telescopes at Starfire Optical Range and Mt. Wilson have demonstrated that spectral resolution can be routinely improved by...
P Prototype, A. Riccardi, G. Brusa, V. Biliotti, C. Del Vecchio, P. Salinari, ...
The 336-actuator adaptive secondary unit (MMT336) for the new MMT is being assembled in Italy and will be delivered in June 2000 for the acceptance test at Steward Observatory (Tucson, AZ). The...
Adaptive optics for the 6.5 m MMT (2000)
M. Lloyd-hart, F. Wildi, H. Martin, P. Mcguire, M. Kenworthy, R. Johnson, ...
The adaptive optics system for the 6.5 m MMT conversion telescope will be the first to compensate the aberrated wavefront at the telescope's secondary mirror. This approach has unique advantages in...
New Approach to Rayleigh Guide Beacons (2000)
M. Lloyd-hart, S. M. Jefferies, E. K. Hege, J. R. P. Angel
We present analysis and numerical simulations of a new method to sense atmospheric wavefront distortion in real time with Rayleigh beacons. Multiple range-gated images of a single pulse from the...
Adaptive Optics High Resolution Spectroscopy: Present Status and Future Direction (1999)
J. Ge, D. Ciarlo, P. Kuzmenko, C. Alcock, B. Macintosh, K. Cook, ...
. High resolution spectroscopy experiments with visible adaptive optics telescopes at Starfire Optical Range and Mt. Wilson have demonstrated that spectral resolution can be routinely improved by a...
Infrared adaptive optics system for the 6.5 m MMT: system status (1998)
M. Lloyd-hart, G. Angeli, R. Angel, P. Mcguire, T. Rhoadarmer, S. Miller
We report on the current state of the adaptive optics system being built for near infrared operation at the 6.5 m MMT. The system will use a single sodium laser beacon and a deformable secondary...
This report outlines the focus of the development of advanced adaptive optics at the University of Arizona, Steward Observatory's Center for Astronomical Adaptive Optics (CAAO). The main focus of the...
T. A. Rhoadarmer, P. C. Mcguire, M. Lloyd-hart, J. R. P. Angel, B. Cuerden, B. Fitzpatrick
A description is given for the geometry of the first generation adaptive-optical (AO) system being developed for the 6.5 m single-mirror telescope that will replace the Multiple Mirror Telescope on...
T. A. Rhoadarmer, P. C. Mcguire, M. Lloyd-hart, J. R. P. Angel, B. Cuerden, B. Fitzpatrick
A description is given for the geometry of the first generation adaptive-optical (AO) system being developed for the 6.5 m single-mirror telescope that will replace the Multiple Mirror Telescope on...
Infrared adaptive optics system for the 6.5 m MMT: system status (1998)
M. Lloyd-hart, G. Angeli, R. Angel, P. Mcguire, T. Rhoadarmer, S. Miller
We report on the current state of the adaptive optics system being built for near infrared operation at the 6.5 m MMT. The system will use a single sodium laser beacon and a deformable secondary...
Astronomical Results using Physically-Constrained Iterative Deconvolution (1998)
E. K. Hege, M. Cheselka, M. Lloyd-hart, P. Hinz, W. F. Hoffmann, J. C. Christou, ...
INTRODUCTION We demonstrate psf calibration using an iterative deconvolution algorithm, derivative from the blind deconvolution algorithm of Jefferies and Christou (1993), to produce...
Laser-based adaptive optics system for the 6.5 m MMT (1997)
M. Lloyd-hart, J. R. P. Angel
The Multiple Mirror Telescope (MMT) will be converted to a single-mirror telescope in early 1998. Adaptive optics using a sodium laser guide star will be an integral part of the new telescope with...
Mesosphere Sodium Column Density and the Sodium Laser Guide Star Brightness (1997)
Ge, Jian, Angel, J. R. P., Jacobsen, B. D., Roberts, T., Martinez, T., Livingston, W., ...
The first time simultaneous measurements of sodium column density and the absolute flux from a sodium laser guide star, created by a monochromatic 3 W cw laser, tuned to the peak of the sodium D2...
M. Lloyd-hart, J. R. P. Angel, T. D. Groesbeck, T. Martinez, B. P. Jacobsen, B. A. Mcleod, ...
Adaptive optics with a sodium resonance laser guide star was used at the Multiple Mirror Telescope (MMT) in 1996 April to image the core of the globular cluster M13 (NGC 6205). A 23² field was...
Final review of adaptive optics results from the pre-conversion MMT (1997)
M. Lloyd-hart, R. Angel, T. Groesbeck, P. Mcguire, D. Mccarthy, T. Martinez, ...
The FASTTRAC II adaptive optics instrument has been used at the Multiple Mirror Telescope (MMT) for the past 2 years to provide improved image resolution in the near infrared. Results have been...
An Optical Ultrahigh Resolution Spectrograph for Use with Adaptive Optics (1996)
Ge, J., Jacobsen, B., Angel, J. R. P., Woolf, N., Black, J. H., Lloyd-Hart, M., ...
A prototype ultrahigh resolution spectrograph has been built with an adaptive optics telescope. It provides $250,000$ resolving power, 300 \AA\ wavelength coverage and 0.8\% efficiency.
M. Lloyd-hart, J. R. P. Angel, T. D. Groesbeck, T. Martinez, B. P. Jacobsen
The first images of astronomical objects have been obtained with a telescope exploiting wavefront compensation with adaptive optics where the reference beacon was generated by laser excitation of...
M. Lloyd-hart, R. Angel, B. Jacobsen, D. Wittman, E. Kibblewhite, B. Carter, ...
A 0.5 W beam from a continuous-wave dye laser, tuned to the D 2 resonance of atomic sodium, has been used to generate an artificial guide star by illuminating the mesospheric sodium layer, 90 km...
Diffraction-limited K-band imaging at the Multiple Mirror Telescope with adaptive optics (1996)
M. Lloyd-hart, D. Colucci, D. Wittman, B. Mcleod, A. Ghez, D. Mccarthy, ...
Low spatial frequencies of atmospheric turbulence are specially troublesome to astronomers because the phase distortions they cause have large amplitude. We have begun experiments at the Multiple...
M. Lloyd-hart, R. Angel, B. Jacobsen, D. Wittman, D. Mccarthy, E. Kibblewhite, ...
A sodium guide star has been used to sense and correct atmospheric aberration during two runs at the Multiple Mirror Telescope (MMT). For the first run in 1993 May, the artificial star was created by...
Progress in Diffraction-Limited Imaging at the Multiple Mirror Telescope with Adaptive Optics (1996)
M. Lloyd-hart, R. Dekany, D. Wittman, R. Angel, D. Mccarthy
this paper were obtained using only the five mirrors highlighted in Fig. 1. With no aberration, the point spread function of this array appears as shown in Fig. 2, with a bright central peak...
Direct 75 Milliarcsecond Images from the Multiple Mirror Telescope with Adaptive Optics (1996)
M. Lloyd-hart, R. Dekany, B. Mcleod, D. Wittman, D. Colucci, D. Mccarthy, ...
We report results from an adaptive optics system designed to provide imaging at the diffraction limit of resolution in the near infrared at the Multiple Mirror Telescope (MMT). For the present...
M. Lloyd-hart, B. Jacobsen, R. Angel, R. Dekany, B. Carter, W. Wild, ...
We have obtained the first measurements with a sodium laser beacon of focus anisoplanatism over large aperture, at the Multiple Mirror Telescope (MMT). Focus anisoplanatism sets the fundamental limit...