Lasing action in water vapor induced by ultrashort laser filamentation
- 3 June 2013
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 102 (22) , 224102
Abstract
The water vapor fluorescence in air from filaments generated by intense ultrashort Ti:sapphire laser pulses is experimentally studied. The backscattered fluorescence from OH shows an exponential increase with increasing filament length, indicating amplified spontaneous emission. By measuring the intensity inside the filament and the fluorescence intensity of OH, a high degree of nonlinearity is obtained, indicating a highly nonlinear field dissociation of H2O molecule.Keywords
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