Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Herbert W. Friedman"'
Autor:
M. M. Michaelis, Herbert W. Friedman, E.V. George, G. Albrecht, James P. Reilly, Donald T. Gavel, John R. Murray, W. Priedhorsky, C. Ho, Claude R. Phipps
Publikováno v:
Scopus-Elsevier
When a large piece of space debris forced a change of flight plan for arecent U.S. Space Shuttle mission, the concept that we are trashing space as well as Earth finally attained broad public awareness. Almost a million pieces of debris have been gen
Autor:
Herbert W. Friedman, James M. Brase, J.T. Salmon, B. Bissinger, D. Gavel, K. Waltjen, K. Avicola, Claire E. Max, S. Olivier, J. Morris
Publikováno v:
LEOS '92 Conference Proceedings.
Publikováno v:
LEOS '92 Conference Proceedings.
A pulse stretcher has been designed for the LLNL sodium guide star experiment to lower the laser flux and avoid saturation effects. The optical design, mechanical layout and wavefront error analysis are presented.
Autor:
Ugur Ortabasi, Herbert W. Friedman
Publikováno v:
AIP Conference Proceedings.
PowerSphere is a variant of the recently developed Photovoltaic Cavity Converter (PVCC) for High Concentration Photovoltaic applications. Both systems share the benefit of photon recycling in a cavity and have therefore the potential to convert high
Autor:
Herbert W. Friedman, J. Brase, S. Olivier, B. Macintosh, K. Avicola, Seran G. Gibbard, Jong R. An, C Max, D. Gavel
The resolution of ground-based telescopes is typically limited to {approx}1 second of arc because of the blurring effects of atmospheric turbulence. Adaptive optics (AO) technology senses and corrects for the optical distortions due to turbulence hun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ef89d29377a975fece1971abd56fdb8
https://doi.org/10.2172/793551
https://doi.org/10.2172/793551
Autor:
Bruce Macintosh, Carmen J. Carrano, Gary J. Freeze, Michael J. Newman, Jong R. An, V.K. Kanz, Kenneth Avicola, Elinor L. Gates, Edward L. Pierce, Herbert W. Friedman, Thomas C. Kuklo, J. Watson, James M. Brase, Jeffrey B. Cooke, Eugene Warren Campbell, Kenneth E. Waltjen, Claire E. Max, Donald T. Gavel, Brian J. Bauman, Scot S. Olivier
Publikováno v:
SPIE Proceedings.
Results of experiments with the laser guide star adaptive optics system on the 3-meter Shane telescope at Lick Observatory have demonstrated a factor of 4 performance improvement over previous results. Stellar images recorded at a wavelength of 2 mic
Publikováno v:
SPIE Proceedings.
The performance of a sodium laser guide star adaptive optics system depends crucially on the characteristics of the laser guide star in the sodium layer. System performance is quite sensitive to sodium layer spot radiance, that is, return per unit st
Autor:
Arnold Migus, Herbert W. Friedman, Renaud Foy, Alain Denis Petit, Jean-Pierre Gex, Jean-Marc Weulersse, François Biraben, Andre Baranne, Michel Tallon, Miska Le Louarn, Gilbert Grynberg
Publikováno v:
SPIE Proceedings.
We describe the principle of the polychromatic laser guide star (LGS) to recover the tilt information in imaging through the atmosphere. Observations using the AVLIS laser at the Lawrence Livermore National Lab are discussed in terms of returned flux
Publikováno v:
SPIE Proceedings.
We discuss astronomical observing requirements and their implementation using sodium-layer laser guide star adaptive optics. Specific issues requiring implementation include the ability to place the astronomical object at different locations within t
Autor:
Herbert W. Friedman, Jen Nan Wong, Holger E. Jones, Michael J. Newman, J. Thaddeus Salmon, Donald T. Gavel, Sherman L. Jenkins, Mark Feldman, R. W. Presta, Gary R. Thompson, Jeffrey B. Cooke, Thomas C. Kuklo, V.K. Kanz, Pamela M. Danforth, Edward L. Pierce, G. Erbert
Publikováno v:
SPIE Proceedings.
A laser system to generate sodium-layer guide stars has been designed, built and delivered to the Keck Observatory in Hawaii. The system uses frequency doubled YAG lasers to pump liquid dye lasers and produces 20 W of average power. The design and pe