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Departmental Colloquium

Ultrashort pulse propagation and ionization in dielectrics  
Guest Speaker
Prof. Jeremy Gulley  
Guest Affiliation
Department of Biology and Physics, Kennesaw State University  
Bill Dennis  
Thursday, September 19, 2013 4:00 pm - 5:00 pm  
Physics Auditorium (Rm 202)  

The numerous applications of femtosecond lasers during the last 15 years has necessitated a detailed understanding of pulse propagation coupled with ultrafast laser-material interactions. Current ultrashort pulse propagation models describe the evolution of fields with broad spectra while models of laser-induced ionization and laser-plasma interactions typically assume monochromatic laser fields. In this seminar I address the inherent contradiction of combining multi- chromatic propagation models with monochromatic laser-material descriptions. Recently published experimental and simulation results are presented that show how this contradiction leads to order-of- magnitude errors in calculating the ionization yield. Further simulation results suggest that multi-chromatic effects will alter the shape and severity of laser-induced modifications to the bulk of dielectric solids.