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QUANTUM OPTICS / AMO PHYSICS SEMINAR


"FEMTOSECOND FILAMENTS IN NITROGEN"


Daniil Kartashov
Photonics Institute, Vienna University

ABSTRACT 

This presentation will give an overview of the recent progress in freespace lasing from nitrogen ignited by a femtosecond filament. The first part of the talk will be devoted to the general ideas and possible control parameters for lasing in atmospheric species with special focus on comparison of different femtosecond laser sources for the filament-assistant lasing. As a confirmation of these ideas, the first experimental demonstration of lasing from a mid-infrared filament in pure nitrogen, pumped by electronneutral molecules collisions, will be presented. In the second part of the talk,very new experimental results, showing the potential of femtosecond filaments for stimulated amplification, will be discussed. Using methods of adaptive control for a near-infrared filament, we have demonstrated stimulated amplification at different wavelengths of electronic transitions in the nitrogen molecular ion, seeded by the filament-generated white light continuum. Similar results were obtained for a tightly focused mid-infrared laser beam where stimulated amplification was seeded by the laser harmonics generated in the gas.


Tuesday, February 7, 2012
IQSE 578, 12:30 p.m.
Mitchell Physics Building


Institute for Quantum Science and Engineering
Texas A&M University

(Brown Bag Lunch)