Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 15: Femtosecond Spectroscopy IV

MO 15.1: Invited Talk

Wednesday, March 20, 2013, 11:00–11:30, F 102

Lasing in Nitrogen Gas Induced by Femtosecond Filamentation — Andrius Baltuska¹, •Daniil Kartashov¹, Jens Möhring², Skirmantas Ališauskas¹, Giedrius Andriukaitis¹, Stefan Hässler¹, Audrius Pugžlys¹, Aleksei Zheltikov^3,4, Markus Motzkus², Misha Ivanov⁵, and Olga Smirnova⁵ — ¹Photonics Institute Vienna University of Technology, Vienna, Austria — ²Physikalisch-Chemisches Institut University Heidelberg, Heidelberg, Germany — ³Physics Department, Russian Quantum Center, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia — ⁴Department of Physics and Astronomy, Texas A&M University, College Station, USA — ⁵Max-Born Institute, Berlin, Germany

Harnessing ultraviolet nitrogen laser emission in air for the purpose of remote sensing has been a topic of numerous studies over the past decade. Unlike in the case of a conventional discharge-driven nitrogen laser, the possible lasing mechanisms are very different for remote excitation with intense femtosecond pulses that form filaments - long narrow channels of low-density cold plasma. New exciting possibilities in this field have arisen since the emergence of novel IR and Mid-IR femtosecond lasers in the past two years. In this talk, we will demonstrate various types of remotely-induced coherent emission, forward as well as backward, from neutral N2 and molecular cation, with and without inversion, which were obtained using single infrared pulses and adaptively shaped pulse trains. The role of free-electron plasma, phase-matched nonlinear wave mixing effects and molecular rotational dynamics will be examined.