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Proceedings Paper

Optically pre-amplified lidar-radar
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Paper Abstract

We present the concept of an optically pre-amplified intensity modulated lidar, where the modulation frequency is in the microwave domain (1-10 GHz). Such a system permits to combine directivity of laser beams with mature radar processing. As an intensity modulated or dual-frequency laser beam is directed on a target, the backscattered intensity is collected by an optical system, pass through an optical preamplifier, and is detected on a high speed photodiode in a direct detection scheme. A radar type processing permits then to extract range, speed and identification information. The association of spatially multimode amplifier and direct detection allows low sensitivity to atmospheric turbulence and large field of view. We demonstrated theoretically that optical pre-amplification can greatly enhance sensitivity, even in spatially multimode amplifiers, such as free-space amplifier or multimode doped fiber. Computed range estimates based on this concept are presented. Laboratory demonstrations using 1 to 3 GHz modulated laser sources and >20 dB gain in multimode amplifiers are detailed. Preliminary experimental results on range and speed measurements and possible use for large amplitude vibrometry will be presented.

Paper Details

Date Published: 19 September 2001
PDF: 10 pages
Proc. SPIE 4377, Laser Radar Technology and Applications VI, (19 September 2001); doi: 10.1117/12.440116
Show Author Affiliations
Loic Morvan, Thales Laboratoire Central de Recherches (France)
Daniel Dolfi, Thales Laboratoire Central de Recherches (France)
Jean-Pierre Huignard, Thales Laboratoire Central de Recherches (France)

Published in SPIE Proceedings Vol. 4377:
Laser Radar Technology and Applications VI
Gary W. Kamerman, Editor(s)

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