Water vapor fluorescence in air induced by femtosecond laser filaments was systematically investigated. The fluorescence signal intensity was found to be linearly proportional to the water vapor concentration, which opens up the possibility of absolute humidity measurements, even remotely.
© 2012 Optical Society of America
Original Manuscript: January 4, 2012
Revised Manuscript: March 6, 2012
Manuscript Accepted: March 9, 2012
Published: May 14, 2012
Tie-Jun Wang, Huailiang Xu, Jean-François Daigle, Aravindan Sridharan, Shuai Yuan, and See Leang, "Water vapor concentration measurement in air using filament-induced fluorescence spectroscopy," Opt. Lett. 37, 1706-1708 (2012)