Abstract
We propose a new mechanism/scheme to explain the ultrafast population inversion of
molecular ions which takes place in a time scale comparable to the femtosecond laser pulse. The
nonlinear pumping process including the pump photons and the self-generated harmonic photons of the
pump laser would be responsible for building up population inversion to realize remote molecule
lasers in femtosecond laser filaments in gases. It is shown that the remote laser emissions in
molecular ions of gases may be a universal process in the femtosecond laser filament.
© 2013 Chinese Optics Letters
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