Experimental confirmation of high-stability of fluorescence in a femtosecond laser filament in air

Femtosecond laser filamentation is particularly interesting for remote sensing pollutant in the atmosphere. In this work, we investigate the local shot-to-shot stability of the filament induced fluorescence of nitrogen in air. It is found that the root-mean square fluctuation of the fluorescence sig...

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Bibliographic Details
Published in:Optics communications 2009-12, Vol.282 (24), p.4800-4804
Main Authors: Xu, Shengqi, Zhang, Yizhu, Liu, Weiwei, Chin, See Leang
Format: Article
Language:English
Subjects:
Beam trapping, self-focusing and defocusing
self-phase modulation
Exact sciences and technology
Femtosecond laser
Filamentation
Fundamental areas of phenomenology (including applications)
Intensity clamping
Nonlinear optics
Optics
Physics
Remote sensing
Ultrafast processes
optical pulse generation and pulse compression
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Summary:Femtosecond laser filamentation is particularly interesting for remote sensing pollutant in the atmosphere. In this work, we investigate the local shot-to-shot stability of the filament induced fluorescence of nitrogen in air. It is found that the root-mean square fluctuation of the fluorescence signal is at least one order of magnitude lower than that of the linear propagation case. In practice, it would contribute to improve the robustness of long distance spectroscopic analysis of the fluorescence of pollutant molecules inside the filament. We further point out that this unique property of filament induced fluorescence spectroscopy is because of the intensity clamping, a profound phenomenon of filamentation.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2009.08.065