Remote sensing with intense filaments enhanced by adaptive optics |
| |
Authors: | J-F Daigle Y Kamali M Chateauneuf G Tremblay F Théberge J Dubois G Roy and S L Chin |
| |
Institution: | (1) Arlington, VA, USA |
| |
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 LIDAR 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|