Abstract.
The backscattered fluorescence of nitrogen from filaments generated by intense ultra-fast Ti:sapphire laser pulses propagating in air is studied. The backscattered fluorescence from N2 molecules and ions show an exponential increase with increasing filament length, indicating amplified spontaneous emission.
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Received: 11 October 2002 / Revised version: 3 December 2002 / Published online: 26 February 2003
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Luo, Q., Liu, W. & Chin, S. Lasing action in air induced by ultra-fast laser filamentation . Appl Phys B 76, 337–340 (2003). https://doi.org/10.1007/s00340-003-1115-9
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DOI: https://doi.org/10.1007/s00340-003-1115-9