Impulsive rotational Raman scattering of N2 by a remote "air laser" in femtosecond laser filament
arXiv:1402.5515 · doi:10.1364/OL.39.002250
Abstract
We report on experimental realization of impulsive rotational Raman scattering from neutral nitrogen molecules in a femtosecond laser filament using an intense self-induced white-light seeding "air laser" generated during the filamentation of an 800 nm Ti: Sapphire laser in nitrogen gas. The impulsive rotational Raman fingerprint signals are observed with a maximum conversion efficiency of ~0.8%. Our observation provides a promising way of remote identification and location of chemical species in atmosphere by rotational Raman scattering of molecules.
4 pages, 4 figures