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SPECIAL AMO PHYSICS SEMINAR


"Filament-ignited free-space nitrogen laser:
problem overview and first results”
"



Daniil Kartashov
Photonics Institute Vienna University of Technology
Vienna, Austria


ABSTRACT 

Since 2009, we have been working on the development of an atmospheric stand-off backward sensing as part of a multilateral project funded by the European Commission. The core objective of this research is to enable a phase-matched Raman signal generation from non-scattering and non-reflective gaseous samples in the backward direction with respect to the excitation laser beam. The prerequisite to realizing such a scheme is remotely induced free-space laser emission from atmospheric gases, which we pursue via laser filamentation with near-IR and mid-IR femtosecond pulses. This presentation will give an overview of the project and recent experimental results on free-space lasing from nitrogen. The following subjects will be discussed: the general idea and possible control parameters for lasing in atmospheric species; comparison of different femtosecond laser sources for the filament-assistant lasing; adaptive UV-fluorescence control and the first demonstration of an efficient laser generation from the filament in the nitrogen-argon gas mixture.


Monday, October 3, 2011
IQSE 578, 4:00 p.m.
Mitchell Physics Building





Institute for Quantum Science and Engineering