Author： Chen Y.
Publisher： Springer Publishing Company
ISSN： 0946-2171
Source： Applied Physics B, Vol.91, Iss.2, 2008-05, pp. : 219-222
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Abstract
We observed a new filamentation nonlinear process: continuous self-frequency down shift inside the filament zone during the propagation of a femtosecond laser pulse in air. The frequency shift depends strongly on the length of the self-guided column (filament).
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