Remote Seating with Intense Filaments Enhanced by Adaptive Optics

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Authors
  1. Daigle, J.-F.
  2. Kamali, Y.
  3. Châteauneuf, M.
  4. Tremblay, G.
  5. Théberge, F.
  6. Roy, G,
  7. Chin, S.L.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN)
Abstract
A method involving a closed loop adaptive optic system is investigated as a tool to significantly enhance the collected optical emissions, for remote sensing applications involving ultrafast laser filamentation. The technique combines beam expansion and geometrical focusing, assisted by an adaptive optics system to correct the wavefront aberrations. Targets, such as a gaseous mixture of air and hydrocarbons, solid lead and airborne clouds of contaminated aqueous aerosols, were remotely probed with filaments generated at distances up to 118 m after the focusing beam expander. The integrated backscattered signals collected by the detection system (15-28 m from the filaments) were increased up to a factor of 7. for atmospheric N2 and solid lead, when the wavefronts were corrected by the adaptive optic system. Moreover, an extrapolation based on a simplified version of the LlDAR equation showed that the adaptive optic system improved the detection distance for N2 molecular fluorescence, from 45 m for uncorrected wavefronts to 125 m for corrected.
Report Number
DRDC-VALCARTIER-SL-2009-421 — Scientific Literature
Date of publication
09 Mar 2009
Number of Pages
13
DSTKIM No
CA033269
CANDIS No
532630
Format(s):
Document Image stored on Optical Disk

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