A LIDAR technique to measure the filament length generated by a high-peak power femtosecond laser pulse in air |
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| Authors: | A Iwasaki N Aközbek B Ferland Q Luo G Roy CM Bowden SL Chin |
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| Institution: | (1) Centre d’Optique, Photonique et Laser (COPL) et Département de Physique, de Génie Physique et d’Optique, Université Laval, Québec, QC, G1K 7P4, Canada, CA;(2) Time Domain Corporation, 7057 Old Madison Pike, Huntsville, AL 35806, USA, US;(3) US Army Aviation and Missile Command, AMRDEC, AMSAM-RD-WS-ST, Redstone Arsenal AL 35898-5000, USA, US;(4) Sensor Performance Prediction Group of the Defence Research and Development Center-Valcartier (DRDC-Valcartier), Val-Belair, QC, G3J 1X5, Canada, CA |
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| Abstract: | We demonstrate a new method for measuring the length of a femtosecond laser pulse induced filament in air using a LIDAR (LIght
Detection And Ranging) technique. The LIDAR involves a detector with a fast response time. The back-scattered multiphoton
induced fluorescence from nitrogen molecules excited inside the filament is measured, from which the length of the filament
can be determined. We find good agreement between the measured filament length and the length estimated from burn patterns
on paper. In addition, good qualitative agreement between the experimental measurement and numerical simulations is obtained
for the signal features of the filament. We propose that this new method can be used to quantitatively determine filamentation
at longer distances.
Received: 11 June 2002 / Revised version: 21 October 2002 / Published online: 5 February 2003
RID="*"
ID="*"Corresponding author. Fax: +1-418/656-2623, E-mail: aiwasaki@phy.ulaval.ca |
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| Keywords: | PACS: 33 80 -b 42 68 Ay 42 68 Wt |
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