Impulsive rotational Raman scattering of N2 by a remote "air laser" in femtosecond laser filament

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

References in corpus (3)

• Self-seeded lasing in ionized air pumped by 800 nm femtosecond laser pulses
• Lasing of ambient air with microjoule pulse energy pumped by a multi terawatt IR femtosecond laser
• Self-induced white-light seeding laser in a femtosecond laser filament

Cited by in corpus (3)

• Backward stimulated radiation from filaments in Nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses
• Gain dynamics of a free-space nitrogen laser pumped by circularly polarized femtosecond laser pulses
• Ramsey interferometry through coherent $X^2{\Sigma }_g^{+}-A^2{\Pi }_u-B^2{\Sigma }_u^{+}$ coupling and population transfer in N${}_2^{+}$ air laser