Physics – Plasma Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dppko1003w&link_type=abstract
American Physical Society, 43rd Annual Meeting of the APS Division of Plasma Physics October 29 - November 2, 2001 Long Beach, C
Physics
Plasma Physics
Scientific paper
Laser break down phenomena in air is well known and often demonstrated with nanosecond lasers: > 0.1 J/pulse focused by cm focal length lenses. Dust enhances the effect, while plasma production from material targets requires fluxes in excess of 100 MW/cm2. It is claimed that particulate, from the burning of ( 20 tons per day) micro meteors, viscously suspended by the onset of the atmosphere at 80 km altitude and 0.01 Torr pressure, can be employed to initiate plasma production with a laser? Without atmosphere effects, a 2.7 meter diameter telescope would focus a 1057 nm laser pulse to a 3 cm spot at 80 km, producing a flux of 25000 MW/cm2 for a 200 J one ns pulse. Atmospheric distortions reduced the intensity of the focal core severely; for example, by 0.03 for a 0.3 wave rms distortion, or to 750 MW/cm2. Energetic electrons from the dust particles should ionize the background gas creating a plasma of 2 km length due to the Rayleigh range of the laser beam. A focused laser experiment is being set up the UCLA/HIPAS Observatory outside of Fairbanks Alaska, using the 2.7 m diameter Liquid Mirror Telescope already there and a SBS laser assembled from Nova components.
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