Sodium-layer laser-guide-star experimental results.

Details Sodium-layer laser-guide-star experimental results. Sodium-layer laser-guide-star experimental results.

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994josaa..11..825a&link_type=abstract

Journal of the Optical Society of America A, Vol. 11, No. 2, p. 825 - 831

Physics

Optics

14

Adaptive Optics: Guide Stars

Scientific paper

The authors describe a series of experiments to characterize the sodium-layer guide star that was formed with the high-power laser developed for the Lawrence Livermore National Laboratory Atomic Vapor Laser Isotope Separation program. An emission spot size of 3.0 m was measured, with an implied laser irradiance spot diameter of 2.0 m. With a transmitted power of 1100 W and an atmospheric transmission of 0.6, the irradiance from the guide star at the ground was 10 (photons/cm2)/ms, corresponding to a visual magnitude of 5.1. The implications for the performance of wave-front sensors with a laser guide star of this magnitude and resulting closed-loop adaptive-optics performance are discussed.

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