Physics – Optics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apopt..28.4141w&link_type=abstract
Applied Optics (ISSN 0003-6935), vol. 28, Oct. 1, 1989, p. 4141-4153.
Physics
Optics
16
Mesosphere, Optical Radar, Pulsed Lasers, Resonance Fluorescence, Spectral Line Width, Star Trackers, Abundance, Field Of View, Reflecting Telescopes, Signal To Noise Ratios
Scientific paper
It was shown previously that saturation effects, which arise when the energy density within the scattering medium is large enough to alter the population densities of the atomic states, may significantly reduce the backscattered signal for a pulsed laser. In this paper, saturation effects are quantified for an inhomogeneously broadened absorption line (such as the Doppler broadening) and an arbitrary laser beam cross section. It is shown that the saturation effects can be characterized by two parameters, the saturation time (which depends on pulse energy, pulse length, and beam width) and the rms laser line width. The impact of saturation on the lidar design is examined, and several design examples are described, including lidar systems for atmospheric research and laser guide stars for adaptive imaging applications in astronomy.
Gardner Chester S.
Welsh Byron M.
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