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Departmental Colloquium

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

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.

 

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