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Title: Improved performance of the laser guide star adaptive optics system at Lick Observatory

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 {micro}m were corrected to over 40% of the theoretical diffraction-limited peak intensity. For the previous two years, this sodium-layer laser guide star system has corrected stellar images at this wavelength to {approx}10% of the theoretical peak intensity limit. After a campaign to improve the beam quality of the laser system, and to improve calibration accuracy and stability of the adaptive optics system using new techniques for phase retrieval and phase-shifting diffraction interferometry, the system performance has been substantially increased. The next step will be to use the Lick system for astronomical science observations, and to demonstrate this level of performance with the new system being installed on the 10-meter Keck II telescope.
Authors:
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Publication Date:
OSTI Identifier:
13892
Report Number(s):
UCRL-JC-134956; YN0100000; 97-ERD-037
YN0100000; 97-ERD-037; TRN: AH200135%%563
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: SPIE 44th Annual Meeting of the International Symposium on Optical Science, Engineering, and Instrumentation, Denver, CO (US), 07/18/1999--07/23/1999; Other Information: PBD: 20 Jul 1999
Research Org:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org:
USDOE Office of Defense Programs (DP) (US)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCURACY; CALIBRATION; DIFFRACTION; INTERFEROMETRY; LASERS; OPTICS; PERFORMANCE; STABILITY; STARS; TELESCOPES; WAVELENGTHS