Lasing Action in Air Induced by Ultrafast Laser Filamentation

Qi Luo, Seyed Abbas Hosseini, Weiwei Liu and See Leang Chin

Backscattered fluorescence from nitrogen molecules from filaments induced by intense, ultrafast Ti:sapphire laser pulses increases exponentially with an increase in the length of the filament. This shows that the fluorescence undergoes amplified spontaneous emission along the filament direction, a finding that could have applications in lightning discharge control and remote sensing.

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