Heterodyne Doppler 1-micron lidar measurement of reduced effective telescope aperture due to atmospheric turbulence

Physics – Optics

Scientific paper

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Atmospheric Turbulence, Doppler Radar, Optical Heterodyning, Optical Radar, Radar Measurement, Telescopes, Apertures, Carbon Dioxide Lasers, Carrier To Noise Ratios, Neodymium Lasers, Wave Fronts

Scientific paper

A pulsed Nd:YAG bistatic focused-beam lidar allowing simultaneous heterodyne and direct detection of the same lidar returns has been experimentally employed to ascertain the effect of atmospheric turbulence on heterodyne and direct-detection lidar at 1 micron, by measuring the average carrier-to-noise ratio and statistical fluctuation level in the return signals under various experimental and atmospheric conditions. Atmospheric turbulence is found capable of reducing the lidar receiver's effective telescope aperture and heterodyne detection efficiency. This observed effective-aperture limitation functionally resembles predictions based on the Clifford and Wandzura (1981) heterodyne wavefront detection theory.

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