University of Connecticut

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Atomic, Molecular, and Optical Physics Seminar

Monday, October 24, 2016
4:00pm – 5:00pm

Storrs Campus
Gant Science Complex, Physics, Room PB-121

Michael Spanner, National Research Council of Canada

Mechanisms of Inversion in Nitrogen Molecular Ions Pumped by Ultrafast Laser Pulses

Experiments on ultrafast laser filamentation have found evidence for optical gain in air. Briefly, during the process of laser filamentation, a strong ultrafast laser pulse ionizes the nitrogen molecules in air and drives population to excited cation states. These excited nitrogen molecular ions can be used as a lasing medium, either amplifying a delayed seed pulse or amplifying the continuum generation originating from nonlinear processes initiated by the pump pulse itself. In my talk, I will present theory work that explores the single-particle response of the nitrogen molecules to the ultrafast pump pulse that initiates the inversion process. The computational models investigate the roles of strong-field ionization of the neutral, post-ionization laser-driven electronic excitation in cation, as well as the vibrational and rotational dynamics in the ion.


Dawn Rawlinson, 486-4916,

Physics Department (primary)

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