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Fiber-optic laser sensor for mine detection and verification

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Abstract

What we believe to be a new optical approach for the identification of mines and explosives by analyzing the surface materials and not only bulk is developed. A conventional manually operated mine prodder is upgraded by laser-induced breakdown spectroscopy (LIBS). In situ and real-time information of materials that are in front of the prodder are obtained during the demining process in order to optimize the security aspects and the speed of demining. A Cr4+:Nd3+:YAG microchip laser is used as a seed laser for an ytterbium-fiber amplifier to generate high-power laser pulses at 1064  nm with pulse powers up to Ep=1  mJ, a repetition rate of frep.=220  kHz and a pulse duration of tp=620  ps. The recorded LIBS signals are analyzed by applying neural networks for the data analysis.

© 2006 Optical Society of America

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