Dr. Jeffrey F. Friedman Profile

Dr. Jeffrey F. Friedman

Professor Emeritus at Univ de Puerto Rico Mayagüez

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Author

Publications (9)

Proceedings Article | 15 September 2011 Paper

Astronomical telescope with holographic primary objective

Thomas Ditto, Jeffrey Friedman, David Content

Proceedings Volume 8146, 814615 (2011) https://doi.org/10.1117/12.893141

KEYWORDS: Space telescopes, Telescopes, Holography, Mirrors, Diffraction gratings, Chromatic aberrations, Diffraction, Holograms, Astronomical telescopes, Optical instrument design

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Proceedings Article | 9 December 2004 Paper

Kilometer scale primary collector telescopy

Thomas Ditto, Jeffrey Friedman, Jeffrey Baker

Proceedings Volume 5578, (2004) https://doi.org/10.1117/12.567574

KEYWORDS: Diffraction gratings, Telescopes, Spectral resolution, Mirrors, Spectroscopy, Spatial resolution, Space telescopes, Diffraction, Spectrographs, Tolerancing

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Proceedings Article | 21 February 2003 Paper

Results from a portable adaptive optics system on the 1-meter telescope at the Naval Observatory Flagstaff Station

Sergio Restaino, G. Charmaine Gilbreath, Don Payne, Jeffrey Baker, Ty Martinez, Michael DiVittorio, David Mozurkewich, Jeffrey Friedman

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.479725

KEYWORDS: Adaptive optics, Telescopes, Observatories, Analytical research, Cameras, Imaging systems, Interferometry, Calibration, Interferometers, Wavefront sensors

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Proceedings Article | 21 February 2003 Paper

Low-cost innovative telescope

Jeffrey Friedman, Jeffrey Baker, Sergio Restaino, Jim Payne, Raymond Desmarais, Galen Gisler, Don Payne, Ty Martinez

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.469810

KEYWORDS: Telescopes, Adaptive optics, Mirrors, Secondary tip-tilt mirrors, Baryon acoustic oscillations, Optical tracking, Geometrical optics, Interferometry, Optics manufacturing, Sensors

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Proceedings Article | 6 November 2002 Paper

Active multimodal control of a floppy telescope structure

Jeffrey Baker, Sergio Restaino, Ty Martinez, Jeffrey Friedman

Proceedings Volume 4825, (2002) https://doi.org/10.1117/12.451955

KEYWORDS: Telescopes, Optical tracking, Ocean optics, Sensors, Adaptive optics, Analytical research, Structural dynamics, Control systems, Performance modeling, Mirrors

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Proceedings Article | 1 February 2002 Paper

Use of accelerometers to reduce dynamic range requirements in an adaptive optics system

Jeffrey Baker, Ty Martinez, Sergio Restaino, David Wick, Don Payne, Galen Gisler, Jeffrey Friedman

Proceedings Volume 4493, (2002) https://doi.org/10.1117/12.454714

KEYWORDS: Adaptive optics, Telescopes, Optical tracking, Mirrors, Ocean optics, Atmospheric optics, Astronomical imaging, Astronomy, Mirror mounts, Control systems

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Proceedings Article | 5 July 2000 Paper

The Magdalena Ridge Observatory: a look ahead

David Westpfahl, Gary Loos, Van Romero, Jeffrey Friedman

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390199

KEYWORDS: Telescopes, Space telescopes, Magdalena Ridge Observatory, Observatories, Interferometry, Missiles, Astronomy, Interferometers, Infrared radiation, Adaptive optics

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Proceedings Article | 19 July 1999 Paper

Innovative low-cost adaptive optics programs: a new mind-set emerges

Jeffrey Baker, Jeffrey Friedman, Isabelle Percheron, Lyle Finkner, Sergio Restaino, Gary Loos

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354995

KEYWORDS: Adaptive optics, Photon counting, Wavefront sensors, Deformable mirrors, Control systems, Imaging systems, Interferometers, Analog electronics, Wavefronts, Mirrors

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Proceedings Article | 24 July 1998 Paper

New University of Puerto Rico/Air Force Research Laboratory initiative in adaptive optics interferometry

Jeffrey Friedman, Gary Loos, Jeffrey Baker, Lyle Finkner, Darryl Sanchez, Isabelle Percheron, Sergio Restaino

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317095

KEYWORDS: Adaptive optics, Space telescopes, Telescopes, Interferometers, Optical fibers, Interferometry, Cameras, Astronomy, Observatories, Mirrors

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The University ofPuerto Rico, Mayaguez, in conjunction with the Deep Space Surveillance Branch (DEBS) ofthe USAF Research Laboratory (AFRL) Phillips Site (PL) in Albuquerque, NM is initiating an Adaptive Optics (AO) Interferometry program. The program will begin with four projects. We currently have finding for a three element optical interferometer, described in this paper, using Technology developed at DEBS, for a new wavefront sensor and a Liquid Crystal (LC) wavefront compensator being presented at this meeting'9.and a Low Light Level Fringe Tracker (LLLFT)"6'1"24 Michelson: Interferometer. We are also developing a program to put a similarly configured inexpensive two-element interferometer test-bed in orbit. The interferometer would have optical elements on a 10-meter boom. It will use Aperture Synthesis by rotation and motion ofthe elements along the booms. The third project under development would incorporate the initial 3-element interferometer into a larger array with the additional collaboration ofNew Mexico Tech and New Mexico State University at a 10,600' site near Socorro, NM. As part ofthe ground based interferometry effort we are trying to develop inexpensive meter class telescopes. The 0.75meter telescopes we are building for our small interferometer will serve as prototypes and system test-beds. The telescopes will be robotic, remotely operable, essentially self-orienting, and portable. We hope to produce such systems for commercial distribution for approximately $250K each. All ofthe ground-based interferometric systems will be configured for remote operation and independent use ofsub-arrays while upgrades and repairs are underway. The major thrust ofthe UPR effort will be to develop inexpensive interferometers for diverse applications with the low light level capabilities and the LC adaptive optics developed at the Phillips Site. Particular applications will be for high-resolution astronomy and satellite imaging. The adaptive optics will be such that they can be placed on the individual telescopes and are not part ofthe interferometer. They will then serve as templates fbr AO systems ofgeneral interest. As an additional part ofall ofthese projects we will try to develop the use ofoptical fibers for several applications. We would like to couple the telescopes with fiber if we can develop an efficient way to couple the output signal from the telescope to the fibers. in addition we hope to use fiber stretchers for optical path compensation to replace expensive conventional optical delay lines. Key words; adaptive optics, interferometer, Liquid Crystal wavefront compensation

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