Abstract
The application of heterodyne lidar to observe molecular scattering
is considered. Despite the reduced Rayleigh cross section, infrared
systems are predicted to require mean power levels comparable with
those of current and proposed direct detection lidars that operate with
the thermally broadened spectra in the visible or
ultraviolet. Rayleigh–Brillouin scattering in the kinetic and
hydrodynamic (collisional) regimes encountered in the infrared is
of particular interest because the observed spectrum approaches a
triplet of relatively narrow lines that are more suitable for wind,
temperature, and pressure measurements.
© 1998 Optical Society of America
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