Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1114..203w&link_type=abstract
IN: Active telescope systems; Proceedings of the Meeting, Orlando, FL, Mar. 28-31, 1989 (A90-30852 12-74). Bellingham, WA, Socie
Astronomy and Astrophysics
Astronomy
Absorption Cross Sections, Atmospheric Boundary Layer, Laser Guidance, Mesosphere, Pulsed Lasers, Atom Concentration, Atomic Energy Levels, Laser Induced Fluorescence, Laser Outputs, Seeing (Astronomy)
Scientific paper
Saturation effects arising when laser energy density is sufficient to significantly alter atomic state population densities may severely limit the brightness of the artificial guide stars created by laser beam projection onto the mesospheric sodium layer. The level of saturation is a function of laser pulse length, energy, beam-width and line-width. A quantification has been made of saturation effects in terms of these parameters, in order to formulate design equations suitable for the design of a laser capable of achieving a specified guide-star brightness while minimizing power and pulse-length requirements. It is determined that an Na laser of 106 mJ pulse energy, 69 microsec pulse length, and 600 MHz line-width, will yield a guide star at zenith bright enough to drive adaptive optics with 18.5-cm seeing cell size.
Gardner Chester S.
Thompson Laird A.
Welsh Byron M.
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